WO2019230047A1 - 熱可塑性エラストマー組成物及びその製造方法 - Google Patents
熱可塑性エラストマー組成物及びその製造方法 Download PDFInfo
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
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- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/247—Heating methods
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
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- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
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- C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2451/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/04—Thermoplastic elastomer
Definitions
- the present invention relates to a thermoplastic elastomer composition containing a crosslinkable rubber and an olefin polymer and a method for producing the same.
- Crosslinkable polar rubber is widely used as a material for a molded article having rubber elasticity.
- a product having good rubber elasticity can be produced by performing crosslinking simultaneously with molding using a crosslinking agent.
- a polar rubber containing a crosslinking agent is molded using a mold, the viscosity increases due to the crosslinking reaction, which makes it difficult to flow into the mold, resulting in a problem that the mold cannot be completely filled. Molding may be defective. For this reason, the advent of a method for improving the moldability of polar rubber for performing cross-linking molding has been desired.
- thermoplastic resin such as polyolefin is excellent in moldability, although its rubber elasticity is insufficient.
- a resin composition having both excellent properties of cross-linked polar rubber and polyolefin is expected to be excellent in moldability and capable of producing a molded article having rubber elasticity. It is known that only an inhomogeneous mixture can be obtained when an attempt is made to produce a molded article having elasticity.
- Patent Document 1 discloses a technique of using a copolymer of epichlorohydrin and ethylene oxide as an uncrosslinked rubber, blending this with a crystalline polyolefin in the presence of a chlorinated hydrocarbon, and crosslinking in that state. ing.
- Patent Document 2 discloses that an olefin polymer using a block copolymer produced from an olefin polymer having a graft-forming functional group and a nitrile rubber having a graft-forming functional group as a compatibilizing agent, A technique for obtaining a blend with nitrile rubber and a technique for crosslinking it with a crosslinking agent are disclosed.
- a graft copolymer comprising a polymer compatibility-imparting segment and an acidic acrylate copolymer rubber compatibility-improving segment is used as a compatibility-improving graft polymer.
- Techniques have been disclosed for improving the compatibility between the polymer and the acrylate copolymer rubber.
- thermoplastic elastomer composition in which the crosslinkable rubber and the olefin polymer are further highly dispersed and have excellent moldability.
- An object of the present invention is to provide a thermoplastic elastomer composition having a crosslinkable polar rubber and an olefin polymer, both of which are highly dispersed with each other and excellent in moldability, and a method for producing the same. Yes.
- the gist of the present invention relates to the following [1] to [15].
- Carbodiimide group-containing compound (A) An olefin polymer (B) having a group that reacts with a carbodiimide group, Polar rubber (C), and crosslinking agent (E) capable of crosslinking the polar rubber (C)
- a thermoplastic elastomer composition obtained by dynamically heat-treating [2] The thermoplastic elastomer composition according to [1], further including an olefin polymer (D).
- thermoplastic elastomer composition as described.
- thermoplastic elastomer composition according to any one of [1] to [3], wherein the polar rubber (C) includes a polar rubber (C1) having a group that reacts with a carbodiimide group.
- thermoplastic elastomer composition according to [4], wherein the polar rubber (C1) having a group that reacts with the carbodiimide group is a polar rubber having a group having active hydrogen in a side chain.
- Plastic elastomer composition containing a reaction product (II) between the carbodiimide group-containing compound (A) and a polar rubber (C1) having a group that reacts with the carbodiimide group.
- Plastic elastomer composition [7] The thermoplastic elastomer composition according to any one of [1] to [6], wherein the carbodiimide group-containing compound (A) is a polycarbodiimide having a repeating unit represented by the following general formula.
- the olefin polymer (B) having a group that reacts with the carbodiimide group is an olefin polymer having a group having an active hydrogen in the side chain.
- the thermoplastic elastomer composition as described.
- the above [1] to [8], wherein the olefin polymer (B) having a group that reacts with a carbodiimide group is a graft copolymer of a polyolefin and a compound having a group that reacts with a carbodiimide group.
- the thermoplastic elastomer composition according to any one of the above.
- thermoplastic elastomer composition according to any one of [2] to [9], wherein the olefin polymer (D) is a propylene polymer.
- the olefin polymer (D) is a propylene polymer.
- the olefin polymer (B) having a group that reacts with the carbodiimide group, the polar rubber (C), and the olefin polymer (D) blended as necessary.
- the thermoplastic elastomer composition according to any one of [1] to [10], wherein the carbodiimide group-containing compound (A) is blended in an amount of 0.01 to 30 parts by mass.
- the sea-island structure is observed in an image of 200 times or more by a scanning electron microscope (SEM), and the average particle size of the island phase is 0.01 to 20 ⁇ m.
- SEM scanning electron microscope
- Carbodiimide group-containing compound (A) An olefin polymer (B) having a group that reacts with a carbodiimide group, Polar rubber (C), A method for producing a thermoplastic elastomer composition, wherein the cross-linking agent (E) capable of cross-linking the polar rubber (C) and a heat treatment are sequentially or simultaneously dynamically treated.
- a method for producing a thermoplastic elastomer composition which comprises dynamically heat-treating a composition comprising
- thermoplastic elastomer composition which has elasticity of a crosslinked polar rubber, is thermoplastic and has excellent moldability, and a method for producing the same.
- the thermoplastic elastomer composition according to the present invention includes a polar rubber having cross-linking and, if necessary, an olefin polymer, and each component is highly dispersed.
- the thermoplastic elastomer composition according to the present invention includes a polar rubber having cross-linking and an olefin polymer, and both are highly dispersed in each other.
- the molded product obtained from the thermoplastic elastomer composition of the present invention has moderate rubber elasticity, excellent mechanical properties such as elongation at break, strength at break, hardness, and shape stability, wear resistance, oil resistance. It is excellent in ozone resistance and can be suitably used for various applications.
- FIG. 1 shows the 1000 time image by SEM of the thermoplastic elastomer composition 1 obtained in Example 1.
- FIG. FIG. 2 shows a 1000 ⁇ image of the thermoplastic elastomer composition 2 obtained in Example 2 by SEM.
- FIG. 3 shows a 1000 ⁇ image of the thermoplastic elastomer composition 3 obtained in Example 3 by SEM.
- FIG. 4 shows a 1000 ⁇ image of the thermoplastic elastomer composition 4 obtained in Example 4 by SEM.
- FIG. 5 shows a 1000 ⁇ image of the thermoplastic elastomer composition 5 obtained in Example 5 by SEM.
- FIG. 6 shows a 1000 ⁇ image of the thermoplastic elastomer composition 6 obtained in Example 6 by SEM.
- FIG. 1 shows the 1000 time image by SEM of the thermoplastic elastomer composition 1 obtained in Example 1.
- FIG. FIG. 2 shows a 1000 ⁇ image of the thermoplastic elastomer composition 2 obtained in Example 2 by SEM.
- FIG. 3 shows a 1000
- FIG. 7 shows a 1000 ⁇ image of the thermoplastic elastomer composition 7 obtained in Example 7 by SEM.
- FIG. 8 shows a 1000 ⁇ image of the thermoplastic elastomer composition 8 obtained in Example 8 by SEM.
- FIG. 9 shows a 1000 ⁇ image of the thermoplastic elastomer composition 9 obtained in Example 9 by SEM.
- FIG. 10 shows a 1000 ⁇ image of the thermoplastic elastomer composition 10 obtained in Example 10 by SEM.
- FIG. 11 shows a 1000 ⁇ image of the thermoplastic elastomer composition 11 obtained in Comparative Example 1 by SEM.
- FIG. 12 shows a 1000 ⁇ image of the thermoplastic elastomer composition 12 obtained in Comparative Example 2 by SEM.
- FIG. 13 shows a 1000 ⁇ image of the thermoplastic elastomer composition 13 obtained in Comparative Example 3 by SEM.
- FIG. 14 shows a 1000-magnification image of the thermoplastic elastomer composition 14 obtained in Comparative Example 4 by SEM.
- FIG. 15 shows a 1000 ⁇ image of the thermoplastic elastomer composition 15 obtained in Example 11 by SEM.
- FIG. 16 shows a 1000 ⁇ image of the thermoplastic elastomer composition 16 obtained in Example 12 by SEM.
- FIG. 17 shows a 1000 ⁇ image of the thermoplastic elastomer composition 17 obtained in Example 13 by SEM.
- thermoplastic elastomer composition comprises a carbodiimide group-containing compound (A), an olefin polymer (B) having a group that reacts with a carbodiimide group, a polar rubber (C), and if necessary, an olefin polymer (D And a crosslinking agent (E) capable of crosslinking the polar rubber (C) are dynamically heat-treated.
- A carbodiimide group-containing compound
- B olefin polymer having a group that reacts with a carbodiimide group
- a polar rubber C
- E crosslinking agent capable of crosslinking the polar rubber
- polycarbodiimide can be synthesized by reacting an organic polyisocyanate in the presence of a catalyst that promotes a carbodiimidization reaction of an isocyanate group.
- the polystyrene-equivalent number average molecular weight (Mn) determined by gel permeation chromatography (GPC) is usually 400 to 500,000. It is preferably 1,000 to 10,000, more preferably 2,000 to 4,000. When the number average molecular weight (Mn) is within this range, each component in the composition exhibits good compatibility, and the resulting thermoplastic elastomer composition has rubber elasticity and oil resistance, and is excellent in moldability. This is preferable.
- the carbodiimide group-containing compound (A) used in the present invention may be used alone or in combination.
- only polycarbodiimide may be used, polycarbodiimide and monocarbodiimide may be used in combination, or only monocarbodiimide may be used.
- the carbodiimide group-containing compound (A) used preferably contains polycarbodiimide.
- carbodiimide group containing compound (A) it is also possible to use a commercially available carbodiimide group containing compound as it is.
- examples of commercially available carbodiimide group-containing compounds include Carbodilite HMV-8CA, HMV-15CA and LA1 manufactured by Nisshinbo Chemical Co., Ltd.
- the carbodiimide group content in the carbodiimide group-containing compound (A) and the obtained reaction product can be measured by 13 C-NMR, IR, titration method, etc., and can be grasped as a carbodiimide equivalent. It is possible to observe peaks at 130 to 142 ppm in 13 C-NMR and 2130 to 2140 cm ⁇ 1 in IR.
- Olefin polymer having a group that reacts with a carbodiimide group (B)
- the olefin polymer (B) having a group that reacts with a carbodiimide group used in the present invention is not particularly limited, but a carbodiimide group is obtained by using the compound (b) having a group that reacts with a carbodiimide group. Can be obtained by introducing a group that reacts with the polyolefin.
- a method for introducing a group that reacts with a carbodiimide group into a polyolefin a well-known method can be adopted.
- a compound (b) having a group that reacts with a carbodiimide group is graft-copolymerized onto a polyolefin main chain.
- examples thereof include a method of radically copolymerizing a compound (b) having a group that reacts with a carbodiimide group and an olefin.
- the olefin polymer (B) having a group that reacts with a carbodiimide group according to the present invention has a group that reacts with a carbodiimide group with respect to an unmodified polyolefin (hereinafter also referred to as a polyolefin main chain) as a main chain. It can be obtained by graft copolymerizing the compound (b).
- the unmodified polyolefin used as the polyolefin main chain is a polymer mainly composed of an aliphatic ⁇ -olefin having 2 to 20 carbon atoms, a cyclic olefin, or a non-conjugated diene, and preferably an ⁇ - having 2 to 10 carbon atoms.
- a coalescence can be preferably used. These can be used for both isotactic and syndiotactic structures, and there is no particular limitation on stereoregularity.
- the carbodiimide group-containing compound (A) as a raw material is at least one of an olefin polymer (B) having a group that reacts with a carbodiimide group and / or a polar rubber (C) described later. It is considered that the compatibility between the polar rubber (C) and the olefin polymer (D) is improved by the reaction between the part and the melt kneading and the resulting reaction product acting as a compatibilizer.
- thermoplastic elastomer composition of the present invention preferably contains a reaction product (I) of a carbodiimide group-containing compound (A) and an olefin polymer (B) having a group that reacts with a carbodiimide group.
- the effect of improving the compatibility by the reaction product (I) becomes more prominent when the reaction product (I) has a main chain approximated to the olefin polymer (D).
- the main chain of the olefin polymer (B) having a group that reacts with the carbodiimide group, which is the main chain of (I), and the structure of the main chain of the olefin polymer (D) are approximate. More preferred.
- the olefin polymer (D) described later is a propylene polymer
- a propylene polymer such as a propylene homopolymer or a copolymer of propylene and another ⁇ -olefin is used as the polyolefin main chain.
- a polymer can be preferably selected and used.
- the density of the polyolefin used for the graft copolymerization is usually 0.8 to 1.2 g / cm 3 , preferably 0.90 to 1.1 g / cm 3 . 3 , more preferably 0.925 to 1.0 g / cm 3 .
- the melt flow rate (MFR) at 190 ° C. or 230 ° C. under a load of 2.16 kg according to ASTM® D1238 of the polyolefin main chain is usually 0.01 to 500 g / 10 minutes, preferably 0.05 to 200 g / 10 minutes, Preferably, it is 0.1 to 100 g / 10 minutes. If the density and MFR are in this range, the density and MFR of the graft copolymer after modification are also comparable, so that handling is easy.
- the crystallinity of the polyolefin main chain used for graft copolymerization is usually 2% or more, preferably 5% or more, more preferably 10% or more. When the crystallinity is within this range, the handleability of the graft copolymer after modification is excellent.
- the number average molecular weight (Mn) measured by gel permeation chromatography (GPC) of the polyolefin main chain used for graft copolymerization is preferably 5,000 to 500,000, more preferably 10,000 to 100,000. . When the average molecular weight (Mn) is within this range, the handling property is excellent.
- the number average molecular weight in ethylene-based polyolefins can be determined in terms of polyethylene when the comonomer amount is 10 mol% or less, and in terms of ethylene-propylene (based on an ethylene content of 70 mol%) if it is 10 mol% or more. Is possible.
- the production of the polyolefin main chain as described above can be carried out by any conventionally known method, for example, polymerization can be performed using a titanium-based catalyst, a vanadium-based catalyst, a metallocene catalyst, or the like.
- the polyolefin used for graft modification may be in the form of either a resin or an elastomer, and both an isotactic structure and a syndiotactic structure can be used, and the stereoregularity is not particularly limited. Commercially available resins can be used as they are.
- the unmodified polyolefin as the polyolefin main chain may have a property close to that of the olefin polymer (D) described later, or may be of a completely different type, but is highly compatible. Is required, the density, monomer composition, stereoregularity, random / block structural unit arrangement, etc. are preferably similar to those of the olefin polymer (D). Preferably it is. Further, the unmodified polyolefin that becomes the polyolefin main chain is more preferably a polyolefin resin having thermoplasticity.
- Compound (b) having a group that reacts with a carbodiimide group examples include a compound having a group having an active hydrogen having reactivity with a carbodiimide group.
- a carboxylic acid, a carboxylic anhydride, an amine, an alcohol, A compound having a group derived from thiol or the like can be mentioned.
- olefin polymer (B) having a group that reacts with a carbodiimide group for example, as a group that reacts with a carbodiimide group, a carboxylic anhydride group, a carboxy group (—COOH), a hydroxy group (—OH)
- a carboxylic anhydride group for example, a carboxylic anhydride group, a carboxy group (—COOH), a hydroxy group (—OH)
- Polyolefin having a group such as thiol group (—SH) is preferably used.
- the compound (b) having a group that reacts with a carbodiimide group among them, a compound having a group derived from an unsaturated carboxylic acid such as carboxylic acid or carboxylic anhydride is preferably used. / Or its derivatives are preferably used.
- a compound having a group having an active hydrogen a compound having a group that can be easily converted into a group having an active hydrogen by water or the like can be preferably used. Specifically, it has an epoxy group or a glycidyl group.
- the compound (b) having a group that reacts with a carbodiimide group may be used alone or in combination of two or more.
- the compound (b) having a group that reacts with a carbodiimide group when used as the compound (b) having a group that reacts with a carbodiimide group, the compound (b) includes an unsaturated compound having at least one carboxy group and a carboxylic anhydride. Examples thereof include unsaturated compounds having one or more groups and derivatives thereof. Examples of unsaturated groups include vinyl groups, vinylene groups, and unsaturated cyclic hydrocarbon groups.
- Specific compounds (b) include acrylic acid, methacrylic acid, maleic acid, fumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, isocrotonic acid, norbornene dicarboxylic acid, bicyclo [2,2,1].
- Examples thereof include unsaturated carboxylic acids such as hept-2-ene-5,6-dicarboxylic acid, or acid anhydrides or derivatives thereof (for example, acid halides, amides, imides and esters).
- acid anhydrides or derivatives include maleenyl chloride, maleenylimide, maleic anhydride, itaconic anhydride, citraconic anhydride, tetrahydrophthalic anhydride, bicyclo [2,2,1] hept-2-ene- 5,6-dicarboxylic anhydride, dimethyl maleate, monomethyl maleate, diethyl maleate, diethyl fumarate, dimethyl itaconate, diethyl citraconic acid, dimethyl tetrahydrophthalate, bicyclo [2,2,1] hept-2- Mention may be made of dimethyl ene-5,6-dicarboxylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, glycidyl (meth) acrylate, aminoethyl methacrylate and aminopropyl methacrylate.
- an unsaturated carboxylic acid and / or derivative thereof is used as the compound (b) having a group that reacts with a carbodiimide group
- it can be used alone or in combination of two or more. it can.
- maleic anhydride, (meth) acrylic acid, itaconic anhydride, citraconic anhydride, tetrahydrophthalic anhydride, bicyclo [2,2,1] hept-2-ene-5,6-dicarboxylic anhydride , Hydroxyethyl (meth) acrylate, glycidyl methacrylate, and aminopropyl methacrylate are preferred.
- dicarboxylic anhydride such as maleic anhydride, itaconic anhydride, citraconic anhydride, tetrahydrophthalic anhydride, bicyclo [2,2,1] hept-2-ene-5,6-dicarboxylic anhydride. It is particularly preferred.
- ⁇ Graft copolymerization method> As a method for obtaining an olefin polymer (B) having a group that reacts with a carbodiimide group used in the present invention by graft copolymerization (graft modification), the above-mentioned polyolefin (polyolefin main chain) serving as a main chain is used. Examples include a method of graft copolymerizing the compound (b) having a group that reacts with a carbodiimide group in the presence of a radical initiator. Such graft copolymerization may be carried out in the presence of a compound (b) having a group that reacts with a carbodiimide group and, if necessary, other ethylenically unsaturated monomers.
- the method of graft copolymerizing the compound (b) having a group that reacts with a carbodiimide group onto the polyolefin main chain is not particularly limited, and conventionally known graft polymerization methods such as a solution method and a melt-kneading method can be employed.
- the olefin polymer (B) having a group that reacts with a carbodiimide group used in the present invention can also be obtained by radical copolymerization of an olefin and a compound (b) having a group that reacts with a carbodiimide group. It is.
- the olefin it is possible to employ the same olefin as that in the case of forming the above-mentioned polyolefin main chain, and the compound (b) having a group that reacts with a carbodiimide group includes a term of graft copolymerization.
- the method for copolymerizing the olefin and the compound (b) having a group that reacts with a carbodiimide group is not particularly limited, and a conventionally known radical copolymerization method can be employed.
- thermoplastic elastomer composition obtained by using the olefin polymer (B) having a group that reacts with the carbodiimide group used in the present invention together with the carbodiimide group-containing compound (A), at least a part thereof is usually present. It reacts with the carbodiimide group-containing compound (A) to form a reaction product (I).
- the thermoplastic elastomer composition according to the present invention exhibits a highly dispersed form of the constituent components and is excellent in mechanical properties. This reaction product (I) is compatible with the thermoplastic elastomer composition. It is considered that one of the causes is that it exhibits an action as a oxidant.
- Content of compound (b) having a group that reacts with a carbodiimide group in the olefin polymer (B) having a group that reacts with a carbodiimide group used in the present invention (content of a portion derived from compound (b)) ) Is usually 0.1 to 10% by mass, preferably 0.1 to 3.0% by mass, and more preferably 0.1 to 2.0% by mass. It is preferable for the content of the compound (b) having a group that reacts with a carbodiimide group to be within the above range because a reaction with the carbodiimide group-containing compound (A) is likely to occur.
- the compound (b) having a group that reacts with a carbodiimide group is present in a state close to a single number on the main chain of the olefin polymer (B) having a group that reacts with a carbodiimide group.
- the reaction product (I) with the carbodiimide group-containing compound (A) is formed during the production of the thermoplastic elastomer composition, gelation due to cross-linking hardly occurs, and the production stability can be maintained.
- the reaction product (I) can sufficiently exhibit the performance as a compatibilizer.
- the olefin polymer (B) having a group that reacts with a carbodiimide group preferably satisfies the following formula (1).
- f Formula weight (g / mol) of the compound (b) having a group that reacts with a carbodiimide group
- M content of the compound (b) having a group that reacts with a carbodiimide group (content of a part derived from the compound (b)) (mass%)
- Mn Number average molecular weight of the olefin polymer (B) having a group that reacts with a carbodiimide group.
- the carbodiimide group-containing compound (A) It is possible to suppress the gelation due to the resulting cross-linking and to manufacture stably.
- the polyolefin as the graft main chain has an ethylene content such as linear low density polyethylene.
- ethylene content such as linear low density polyethylene.
- the number average molecular weight can be determined by a general molecular weight measurement method for polymers such as GPC method, light scattering method, low angle light scattering photometry method, vapor pressure osmotic pressure method, membrane osmotic pressure method.
- the melt flow rate (MFR) at a load of 2.16 kg, 190 ° C. or 230 ° C. according to ASTM D1238 of the olefin polymer (B) having a group that reacts with the carbodiimide group used in the present invention is determined by the thermoplastic elastomer composition.
- the compatibility between the polar rubber (C) and the olefin polymer (D) is more excellent in the obtained thermoplastic elastomer composition, which is preferable.
- the density of the olefin polymer (B) having a group that reacts with a carbodiimide group is usually 0.8 to 1.2 g / cm 3 , preferably 0.8 to 1.1 g / cm 3 , more preferably 0.8. -1.0 g / cm 3 .
- olefin polymers (B) having a group that reacts with a carbodiimide group in such a range polyethylene, polypropylene, polybutene 1, poly-4-methylpentene-1, and the copolymer weight of these with ⁇ -olefin
- a maleic anhydride graft copolymer of a crystalline polyolefin such as a polymer is preferred, and depending on the object of compatibilization, a maleic anhydride graft copolymer of polyethylene or polypropylene is more preferred, and a maleic anhydride graft copolymer of polypropylene is preferred. More preferred is coalescence.
- the density of the olefin polymer (B) having a group that reacts with a carbodiimide group is not particularly limited, but if necessary, the density of the olefin polymer (D) constituting the thermoplastic elastomer composition. Those having a density close to that of the polar rubber (C) or a density between the density of the polar rubber (C) and the density of the olefin polymer (D) are more preferable.
- the olefin polymer (B) having a group that reacts with such a carbodiimide group a polymer prepared as appropriate by the above graft copolymerization or radical copolymerization may be used, or a commercially available one may be used.
- Examples of the polyolefin (A) having a group that reacts with a commercially available carbodiimide group include Admer (registered trademark) manufactured by Mitsui Chemicals, Inc., Orevac (registered trademark) manufactured by Arkema, Polybond (registered trademark) manufactured by Addivant, and the like. It is done.
- Polar rubber (C) As the polar rubber (C), polar rubbers can be used without particular limitation, but in addition to carbon (C) and hydrogen (H) in the molecular structure, nitrogen (N), oxygen (O) Rubber having a polar group containing atoms such as sulfur (S), halogen (F, Cl, Br, etc.), phosphorus (P), etc. is preferred, and rubber having a polar group in the side chain is more preferred.
- polar rubber (C) examples include carboxy group-containing nitrile rubber, hydrogenated carboxy group-containing nitrile rubber, nitrile rubber, nitrile rubber hydrogenated, carboxyl group-containing acrylic rubber, epoxy group-containing Examples include acrylic rubber, acrylic rubber, carboxy group-containing epichlorohydrin rubber, epichlorohydrin rubber, chloroprene rubber, chlorosulfonated polyethylene, chlorinated polyethylene, polysulfide rubber, fluororubber, and hydrogenated ethylenically unsaturated nitrile-conjugated diene rubber. Among these, nitrile rubber and carboxy group-containing nitrile rubber are particularly preferable.
- the polar rubber (C) used in the present invention preferably has a number average molecular weight in the range of 5,000 to 2,000,000, more preferably in the range of 10,000 to 500,000.
- a number average molecular weight in the range of 5,000 to 2,000,000, more preferably in the range of 10,000 to 500,000.
- the Mooney viscosity (ML 1 + 4 , 100 ° C.) of the polar rubber (C) is preferably 10 to 200, more preferably 20 to 150.
- the polar rubber (C) has a solubility parameter (SP value) of usually 16.5 to 30 (MPa) 0.5 , preferably 17 to 29 (MPa) 0.5 , more preferably 17.5 to 28 (MPa) 0.5 . It is desirable.
- a polar rubber (C) may be used individually by 1 type, and may be used in combination of 2 or more type.
- the polar rubber (C) according to the present invention is not particularly limited, but is preferably an amorphous elastic copolymer that is at least partially crosslinkable using a crosslinking agent.
- the polar rubber (C) preferably contains a polar rubber (C1) having a group that reacts with a carbodiimide group.
- the total amount of the polar rubber (C) may be a polar rubber (C1) having a group that reacts with a carbodiimide group, and a part of the polar rubber (C) has a group that reacts with a carbodiimide group.
- Polar rubber (C1) may be used.
- the group that reacts with the carbodiimide group means a group having active hydrogen or a group that can be easily converted into a group having active hydrogen by water or the like.
- Examples of the polar rubber (k) having a group that reacts with a carbodiimide group react with a carbodiimide group such as a carboxylic anhydride group, a carboxy group (—COOH), a hydroxy group (—OH), and a thiol group (—SH).
- Examples thereof include polar rubbers having a group, and particularly polar rubbers containing a carboxy group.
- the polar rubber (C1) having a group that reacts with a carbodiimide group a carboxy group-containing nitrile rubber, a hydrogenated carboxy group-containing nitrile rubber, a carboxyl group-containing acrylic rubber, an epoxy group-containing acrylic rubber, a carboxy group-containing Examples include epichlorohydrin rubber.
- the polar rubber (C1) having a group that reacts with a carbodiimide group may be used alone or in combination of two or more.
- thermoplastic elastomer composition of the present invention contains the polar rubber (C1) having a group that reacts with a carbodiimide group, it may be obtained depending on the manufacturing process such as the order of melt kneading.
- the resulting thermoplastic elastomer composition contains the reaction product (II) of the carbodiimide group-containing compound (A) and the polar rubber (C1) having a group that reacts with the carbodiimide group.
- the thermoplastic elastomer composition contains the reaction product (II)
- the compatibility of each component in the thermoplastic elastomer composition is further improved, which is preferable.
- the olefin polymer (D) constituting the thermoplastic elastomer composition of the present invention is a polymer or copolymer mainly having a structural unit derived from an olefin, and has reactivity with a carbodiimide group. It has substantially no group. “Substantially free of” a group having reactivity with a carbodiimide group means that it actually reacts with the carbodiimide group of the carbodiimide group-containing compound (A) in the state prepared as the thermoplastic elastomer composition of the present invention. This means that even if a very small amount of the group is contained, the contribution to the effect of the present invention is not recognized.
- Examples of the olefin polymer (D) are the same as those described in the section of the polyolefin main chain, which is the main chain of the olefin polymer (B) having a group that reacts with the carbodiimide group. .
- the olefin polymer (D) used in the present invention is a polymer or copolymer mainly composed of an aliphatic ⁇ -olefin having 2 to 20 carbon atoms, a cyclic olefin, or a non-conjugated diene, preferably A polymer or copolymer mainly composed of an ⁇ -olefin having 2 to 10 carbon atoms, more preferably an ⁇ -olefin having 2 to 8 carbon atoms.
- These olefins used as monomers may be used alone or in combination of two or more.
- the comonomer content is usually 50 mol% or less, preferably 40 mol% or less, more preferably 30 mol% or less.
- the olefin polymer (D) is usually a polyolefin resin having thermoplasticity.
- olefin polymer (D) ethylene, propylene, 1-butene, 4-methyl-1-pentene, 3-methyl-1-butene, 1-hexene, 1-octene, tetracyclododecene Norbornene homopolymers or copolymers can be preferably used. These can be used for both isotactic and syndiotactic structures, and there is no particular limitation on stereoregularity.
- the production of the polyolefin as described above can be carried out by any conventionally known method.
- the polymerization can be carried out using a titanium catalyst, a vanadium catalyst, a metallocene catalyst or the like.
- the olefin polymer (D) is preferably a polypropylene polymer.
- the polypropylene polymer include propylene homopolymers, copolymers of propylene and other ⁇ -olefins, and the like. These propylene polymers can be preferably selected and used.
- the melt flow rate (MFR) measured at 2.16 kgf and 230 ° C. is 0.01 to 500 g / 10 min, preferably 0, according to ASTM D1238. The range is from 0.05 to 200 g / 10 min, more preferably from 0.1 to 100 g / 10 min.
- the crosslinking agent (E) is a crosslinking agent capable of crosslinking the polar rubber (C) described above.
- the crosslinking agent (E) various known crosslinking agents generally used when crosslinking rubber can be used. Specifically, for example, organic peroxides, phenol resins, sulfur compounds, hydrosilicone compounds, amino resins, quinones or their derivatives, amine compounds, azo compounds, epoxy compounds, thiourea compounds, thiazole compounds Examples thereof include crosslinking agents such as compounds, triazine compounds, and isocyanates.
- a crosslinking agent such as an organic peroxide, a phenol resin, or a sulfur compound is preferable.
- Organic peroxides include dicumyl peroxide, di-tert-butyl peroxide, 2,5-di- (tert-butylperoxy) hexane, 2,5-dimethyl-2,5-di- (tert-butylperoxy) Hexane, 2,5-dimethyl-2,5-di- (tert-butylperoxy) hexyne-3, 1,3-bis (tert-butylperoxyisopropyl) benzene, 1,1-bis (tert-butylperoxy)- 3,3,5-trimethylcyclohexane, n-butyl-4,4-bis (tert-butylperoxy) valerate, benzoyl peroxide, p-chlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert-butylperoxybenzoate, ert -Butylperoxyisopropyl car Sulfon
- crosslinking aids include quinone dioxime crosslinking aids such as sulfur and p-quinonedioxime; acrylic crosslinking aids such as ethylene glycol dimethacrylate and trimethylolpropane trimethacrylate; diallyl phthalate and triallyl Allyl-based crosslinking aids such as isocyanurate; other maleimide-based crosslinking aids; divinylbenzene; zinc oxide (for example, ZnO # 1 and zinc oxide 2 types, manufactured by Hux Itec Corp.), metal oxides such as magnesium oxide, etc. It is done.
- the amount of the crosslinking aid is usually 0.01 to 10 mol, preferably 0.1 to 7 mol, more preferably 0.5 to 5 mol, relative to 1 mol of the organic peroxide.
- phenol resin-based crosslinking agent examples include resole resins obtained by condensing alkyl-substituted or unsubstituted phenol with an aldehyde (preferably formaldehyde) in the presence of an alkali catalyst.
- the alkyl group of the alkyl-substituted phenol is preferably an alkyl group having 1 to about 10 carbon atoms. Further preferred are dimethylolphenols or phenolic resins substituted with an alkyl group having from 1 to about 10 carbon atoms in the p-position.
- Crosslinking with a phenolic resin-based crosslinking agent is described in, for example, US Pat. No. 4,311,628, US Pat. No. 2,972,600, and US Pat. No. 3,287,440.
- the phenol resin-based crosslinking agent is also available as a commercial product.
- Commercially available products include, for example, Takuro Chemical Industry Co., Ltd. Tackol 201, Tacchi Roll 250-I, Tacchi Roll 250-III; SI Group SP1045, SP1055, SP1056; Showa Denko Corporation Shounol CRM; Arakawa Chemical Industries, Ltd. No. 5 Tamanol 531; Sumitomo Bakelite Co., Ltd. Sumitrite Resin PR; Gunei Chemical Industry Co., Ltd. cash register top, etc. Two or more of these can be used in combination. Among them, Takiroll 250-III (brominated alkylphenol formaldehyde resin) manufactured by Taoka Chemical Co., Ltd. and SP1055 (brominated alkylphenol formaldehyde resin) manufactured by SI Group are preferable.
- crosslinking agent (E) when a phenol resin crosslinking agent is used as the crosslinking agent (E), it is preferable to use a crosslinking aid in combination.
- a crosslinking aid include metal halides such as stannous chloride and ferric chloride, halogen-containing polymers such as chloroprene rubber and halogenated butyl rubber, and zinc oxide (for example, ZnO # 1 and zinc oxide 2). Seeds, manufactured by Hakusuitec Co., Ltd.) and metal oxides such as magnesium oxide.
- sulfur compounds examples include sulfur, sulfur chloride, sulfur dichloride, morpholine disulfide, alkylphenol disulfide, tetramethylthiuram disulfide, and selenium dithiocarbamate.
- a sulfur compound is used as the crosslinking agent (E), it is preferable to use a vulcanization accelerator in combination.
- a vulcanization accelerator include N-cyclohexyl-2-benzothiazole sulfenamide, N-oxydiethylene-2-benzothiazole sulfenamide, N, N′-diisopropyl-2-benzothiazole sulfenamide, 2-mercaptobenzothiazole (for example, Sunseller M (trade name; manufactured by Sanshin Chemical Industry Co., Ltd.)), 2- (4-morpholinodithio) penzothiazole (for example, Noxeller MDB-P (trade name; Ouchi Shinsei Chemical) Manufactured by Kogyo Co., Ltd.), 2- (2,4-dinitrophenyl) mercaptobenzothiazole, 2- (2,6-diethyl-4-morpholinothio) benzothiazole and dibenzothiazyl disul
- a sulfur compound is used as the crosslinking agent (E)
- a vulcanization aid examples include zinc oxide (for example, ZnO # 1, 2 types of zinc oxide, manufactured by Hakusuitec Co., Ltd.), magnesium oxide, and the like.
- thermoplastic elastomer composition of the present invention an organic peroxide crosslinking agent or a phenol resin crosslinking agent is preferably used as the crosslinking agent (E).
- the thermoplastic elastomer composition of the present invention includes the above-described polar rubber (C) and a crosslinking agent (E) capable of cross-linking the polar rubber (C) as raw materials.
- a crosslinking agent (E) capable of cross-linking the polar rubber (C) as raw materials.
- the thermoplastic elastomer composition at least a part of the polar rubber (C) usually forms a crosslinked structure. That is, the thermoplastic elastomer composition of the present invention usually contains a crosslinked product of polar rubber (C).
- the thermoplastic elastomer composition of the present invention contains a cross-linked polar rubber that is a cross-linked product of polar rubber, thereby having suitable elasticity and excellent chemical resistance.
- thermoplastic elastomer composition of the present invention the polar rubber (C), reaction product (II) or olefin polymer having a group that reacts with the carbodiimide group-containing compound (A) and the carbodiimide group (
- One of the three component reaction products (III) of B) and polar rubber (C) may form a cross-link, and the reaction product (II) or reaction product (III)
- the rubber (C) may have a crosslink with each other.
- each component of the thermoplastic elastomer composition becomes more compatible and hardly separates. preferable.
- thermoplastic elastomer composition of the present invention comprises the carbodiimide group-containing compound (A), an olefin polymer (B) having a group that reacts with a carbodiimide group, a polar rubber (C), an olefin polymer (You may contain components other than D) and a crosslinking agent (E) as a raw material in the range which does not impair the objective of this invention.
- thermoplastic elastomer composition of the present invention includes a known plasticizer (F), crosslinking aid (G), softener, tackifier, and antiaging agent as long as the object of the present invention is not impaired.
- Additives (H) such as antistatic agents, colorants, lubricants, flame retardants, antiblooming agents, reinforcing agents, activators, hygroscopic agents, colorants, and thickeners can also be blended.
- the thermoplastic elastomer composition of the present invention preferably contains a plasticizer (F) and / or a crosslinking aid (G).
- the plasticizer (F) is not particularly limited, and known plasticizers can be used. Examples thereof include phthalate ester plasticizers such as dibutyl phthalate and dioctyl phthalate; dioctyl adipate, dibutyl sebacate and the like.
- Aliphatic dibasic acid ester plasticizer Trimellitic acid ester plasticizer such as tridecyl trimellitate; Aliphatic dibasic acid ether ester plasticizer such as dibutoxyethoxyethyl adipate; Ether ester plasticizer; Polyester Phosphate plasticizers; Epoxy plasticizers such as epoxidized soybean oil and epoxidized linseed oil; Petroleum such as process oil, lubricating oil, aromatic oil, naphthenic oil, paraffin oil, liquid paraffin, petroleum jelly Substances; coal tars such as coal tar and coal tar pitch; Fatty oils such as mashi oil, linseed oil, rapeseed oil, soybean oil, coconut oil; waxes such as tall oil, beeswax, lanolin; fatty acids such as ricinoleic acid, palmitic acid, stearic acid, calcium stearate or metal salts thereof; Synthetic polymer materials such as petroleum resins, chroman indene
- polar rubber (C) From the standpoint of affinity, various ester plasticizers such as a phthalate plasticizer, an aliphatic dibasic ether ether plasticizer, and an ether ester plasticizer are preferred.
- the crosslinking aid (G) is not particularly limited, and examples thereof include the crosslinking aid described above in the section of the crosslinking agent (E).
- thermoplastic elastomer composition may be blended from the beginning as raw materials for the production of the thermoplastic elastomer composition, or may be added at the stage of dynamically heat-treating the raw materials. It may be added after it is obtained.
- thermoplastic elastomer composition of the present invention is not particularly limited, but an olefin polymer (B) having a group that reacts with a carbodiimide group, a polar rubber (C), and an olefin weight.
- the carbodiimide group-containing compound (A) is usually 0.01 to 30 parts by weight, preferably 0.01 to 20 parts by weight, more preferably 0.01 to 15 parts by weight with respect to 100 parts by weight of the combined body (D). It is desirable to be obtained by using within the range of parts.
- the thermoplastic elastomer composition of the present invention comprises a carbodiimide group-containing compound (A), an olefin polymer (B) having a group that reacts with the carbodiimide group, the polar rubber (C), and the olefin polymer (
- the carbodiimide group-containing compound (A) has a group that reacts with the carbodiimide group in a proportion of usually 0.01 to 30% by mass, preferably 0.01 to 20% by mass.
- the olefin polymer (B) is usually 0.05 to 70% by mass, preferably 0.1 to 60% by mass
- the polar rubber (C) is usually 10 to 95% by mass, preferably 20 to 90% by mass.
- the olefin polymer (D) is usually used in the proportion of 0 to 85% by mass, preferably 2 to 85% by mass, more preferably 4 to 70% by mass. Bets are preferred embodiments.
- thermoplastic elastomer composition of the present invention is based on a total of 100 parts by mass of the olefin polymer (B) having a group that reacts with a carbodiimide group and the olefin polymer (D) blended as necessary.
- the carbodiimide group-containing compound (A) is usually obtained (mixed) in an amount of 0.01 to 30 parts by mass, preferably 0.03 to 25 parts by mass.
- the thermoplastic elastomer composition of the present invention is a total of polar rubber (C), olefin polymer (B) having a group that reacts with a carbodiimide group, and olefin polymer (D) blended as necessary.
- the mass ratio (C): ⁇ (B) + (D) ⁇ is normally 1:99 to 99: 1, preferably 5:95 to 95: 5.
- thermoplastic elastomer composition of the present invention contains the olefin polymer (D), the blending ratio of the polar rubber (C) and the olefin polymer (D) in the thermoplastic elastomer composition is Although not particularly limited, it is desirable that the mass ratio (C) :( D) of the raw materials normally satisfies 1:99 to 99: 1, preferably 5:95 to 95: 5.
- the thermoplastic elastomer composition of the present invention comprises, for example, a polar rubber (C) and an olefin polymer (D), and the mass ratio (C) :( D) of raw materials satisfies 51:49 to 99: 1. It may be contained in a proportion, or it may be contained in a proportion satisfying 30:70 to 70:30.
- the crosslinking agent (E) is usually 0 with respect to 100 parts by mass of the polar rubber (C). It is desirable to contain 0.01 to 15 parts by mass, preferably 0.05 to 10 parts by mass.
- thermoplastic elastomer composition of the present invention contains a plasticizer (F)
- the plasticizer (F) is usually used in an amount of 1 to 150 parts by weight, preferably 3 parts per 100 parts by weight of the polar rubber (C). It is desirable to contain ⁇ 100 parts by mass.
- Thermoplastic elastomer composition and method for producing the same comprises the above-mentioned carbodiimide group-containing compound (A), an olefin polymer (B) having a group that reacts with a carbodiimide group, a polar rubber (C), and an olefin blended as necessary.
- the polymer (D) and the crosslinking agent (E) capable of crosslinking the polar rubber (C) are dynamically heat-treated.
- the thermoplastic elastomer composition of the present invention may contain the above-described other components as necessary.
- the blending ratio of each component in the thermoplastic elastomer composition of the present invention is not particularly limited, and is preferably as described above.
- the manufacturing method of the thermoplastic elastomer composition of the present invention is not particularly limited as long as the thermoplastic elastomer composition is manufactured through a step of dynamically heat-treating each component as a raw material.
- Examples of the method for producing the thermoplastic elastomer composition of the present invention include a method in which the respective components are melted and kneaded in a batch or sequentially. That is, the thermoplastic elastomer composition of the present invention may be prepared by batch mixing and dynamically heat-treating each component as a raw material, or adding each component sequentially in any order. You may prepare by heat-processing dynamically.
- a method of dynamically heat-treating is not particularly limited, but melt kneading is preferable.
- the temperature for melting and kneading it is preferable to employ a temperature at which each component melts, and it is preferable to employ a temperature higher than the melting point of the component having the highest melting point among the raw materials to be subjected to melt kneading, but usually 130 to 400. It can be carried out in the temperature range of ° C, preferably 160 to 280 ° C.
- thermoplastic elastomer composition of the present invention contains a carbodiimide group-containing compound (A) and a compound (B) containing a group that reacts with a carbodiimide group as raw materials, in the obtained thermoplastic composition
- the carbodiimide group-containing compound (A) described above and the “group that reacts with the carbodiimide group” of the olefin polymer (B) having a group that reacts with the carbodiimide group at least partially react by melt kneading, and the carbodiimide It is considered that there may be formed a reaction product (I) between the group-containing compound (A) and the olefin polymer (B) having a group that reacts with the carbodiimide group.
- This reaction product (I) has a polyolefin chain derived from the olefin polymer (B) having a group that reacts with a carbodiimide group, and also has a carbodiimide group. Since such a reaction product (I) has a carbodiimide group which is a polar group, it is excellent in compatibility with the polar rubber (C) and has a polyolefin chain, so that it is blended as necessary. The compatibility with the olefin polymer (D) is also excellent.
- thermoplastic elastomer composition of the present invention contains the olefin polymer (D), the polar rubber (C) and the olefin polymer (D) are both in the thermoplastic elastomer composition. Compared to the case of simply mixing, the mixture is highly mixed and well dispersed. Therefore, the thermoplastic elastomer composition of the present invention preferably contains a reaction product (I) of a carbodiimide group-containing compound (A) and an olefin polymer (B) having a group that reacts with a carbodiimide group.
- thermoplastic elastomer composition of the present invention contains the polar rubber (C) and the crosslinking agent (E) capable of crosslinking the polar rubber (C) as raw materials, the thermoplastic elastomer composition of the present invention.
- the thermoplastic elastomer composition of the present invention usually contains a crosslinked polar rubber that is a crosslinked product of the polar rubber (C).
- the crosslinked polar rubber that is a crosslinked product of the polar rubber (C) and the olefin polymer (D) blended as necessary are highly dispersed.
- thermoplastic elastomer composition of the present invention any of the polar rubber (C), the reaction product (II) or the reaction product (III) described above may form a cross-link.
- the product (II) or the reaction product (III) and the polar rubber (C) may have crosslinks with each other. That is, the thermoplastic elastomer composition of the present invention may contain a cross-linked product obtained by cross-linking these two or more components.
- thermoplastic elastomer composition of the present invention has a suitable elasticity by containing a crosslinked product, is excellent in chemical resistance, and contains an olefin polymer (D) as necessary. Therefore, it has excellent moldability.
- the thermoplastic elastomer composition of the present invention is preferable because each component constituting the composition is highly dispersed and hardly separated. This is because the reaction product (I), reaction product (II), etc. are produced in the thermoplastic elastomer composition part and act as a compatibilizing agent, or at least part of the raw material forms a crosslink. This is considered to be caused by entanglement with each other.
- thermoplastic elastomer composition of the present invention the crosslinked polar rubber that is a crosslinked product of the polar rubber (C) and the olefin polymer (D) blended as necessary are highly dispersed,
- the thermoplastic elastomer composition has excellent moldability, and the molded product obtained from the thermoplastic elastomer composition has excellent elasticity, oil resistance, and chemical resistance.
- each component, in particular, the crosslinked polar rubber and the olefin polymer (D) blended as necessary is highly dispersed.
- the thermoplastic elastomer The surface or cross section of the molded product obtained from the composition is observed with a microscope or the like, and can be easily confirmed by the sufficiently small dispersed particle size.
- thermoplastic elastomer composition of the present invention a sea-island structure is observed in an image of 200 times or more by a scanning electron microscope (SEM), for example, an image of about 1000 times, and the average particle size of the island phase is preferably 0.01. It is desirable to be in the range of ⁇ 20 ⁇ m, more preferably in the range of 0.01 to 10 ⁇ m.
- the molded body of the present invention contains the above-described thermoplastic elastomer composition of the present invention.
- the molded object of this invention should just contain the thermoplastic elastomer composition of this invention in part at least.
- the molding method for producing the molded article of the present invention is not particularly limited, and any conventionally known method can be adopted.
- any conventionally known method can be adopted.
- injection molding, press molding, extrusion molding, or the like can be used.
- the molded product of the present invention can be easily manufactured with good moldability, and is excellent in mechanical properties such as flexibility, elasticity, and breaking strength, Excellent oil and chemical resistance.
- the number average molecular weight (Mn) was measured by gel permeation chromatography (GPC). Measurement was carried out as follows using a gel permeation chromatograph Alliance GPC-2000 manufactured by Waters.
- the separation column uses two TSKgel GMH6-HT and two TSKgel GMH6-HTL, both of which are 7.5 mm in diameter and 300 mm in length, the column temperature is 140 ° C., and the mobile phase is o -Using dichlorobenzene (Wako Pure Chemical Industries) and 0.025% by weight BHT (Takeda Pharmaceutical) as an antioxidant, moving at 1.0 ml / min, sample concentration 15 mg / 10 mL, sample injection volume 500 micron A differential refractometer was used as a detector.
- the standard polystyrene used was manufactured by Tosoh Corporation for molecular weights of Mw ⁇ 1000 and Mw> 4 ⁇ 10 6 , and used by Pressure Chemical Co. for 1000 ⁇ Mw ⁇ 4 ⁇ 10 6 .
- maleic anhydride-modified polypropylene it was calculated in terms of polypropylene.
- Breaking strength (TB) (MPa), elongation at break (EB) (%) The thermoplastic elastomer composition was press-molded at 210 ° C. to prepare a press sheet having a length of 200 mm, a width of 200 mm, and a thickness of 2 mm, and this press sheet was punched to prepare a dumbbell-shaped (JIS-3) test piece.
- tensile strength (TB) and elongation (EB) were measured at a tensile speed of 500 mm / min using this test piece.
- Compression set A press-molded sheet produced from a thermoplastic elastomer composition by a press molding machine is compressed 25% using a spacer in accordance with JIS K6262, heat-treated at 70 ° C. for 24 hours, and after treatment in a thermostatic chamber at 23 ° C. After leaving for 30 minutes, the thickness was measured, and compression set (CS) was determined from the following formula.
- CS [(t0 ⁇ t1) / (t0 ⁇ t2)] ⁇ 100
- Samples were stained with the resin component using a particle size ruthenium tetroxide, scanning electron microscope using a (measurement apparatus JEOL Ltd. JSM-7001F), analyzes the image obtained by expanding at 500 to 3000 times did.
- the analysis was performed by performing binarization using image analysis software ImageJ.
- the occupied area of the polypropylene resin and polar rubber particles in this image was specified.
- the area of each identified area occupied by the particle was calculated by image analysis. And the diameter of the perfect circle of the area equal to the area was calculated
- Shore A hardness Based on JIS K6253, it measured with the Shore hardness meter (A hardness meter) using the press sheet of thickness 2mm.
- Oil resistance test Based on JIS K6258, IRM903 oil was used under the conditions of 125 ° C. and 72 hours, and the volume change rate ⁇ V (%) after the immersion test was determined.
- a test piece prepared from a press sheet having a thickness of 2 mm was sealed with a lid.
- a blank correction cup in which the same amount of Fuel C or CE20 is sealed with an aluminum lid instead of a press sheet is kept in a nitrogen atmosphere maintained at a temperature of 40 ° C. ⁇ 2 ° C. and a humidity of 0% RH. The weight change was measured objectively (once / day).
- the test was carried out continuously for 144 hours or more, and a value obtained by subtracting the value of the blank correction cup was determined as a weight change amount at each time.
- the obtained weight change amount was plotted against time, and the transmittance (g / (m 2 ⁇ 24h)) was calculated from the slope / transmission area of the straight line. Further, a transmission coefficient (g ⁇ mm / (m 2 ⁇ 24 h)) was obtained from the actual measurement value (mm) ⁇ transmittance of the thickness of the press sheet used for the measurement.
- test piece JIS K 6251 standard dumbbell-shaped No. 1
- JIS K 6251 standard dumbbell-shaped No. 1 punched out from a 2 mm-thick press sheet has a temperature of 40 ⁇ 2 ° C. and an ozone concentration of 50
- a state where a strain of 20% was applied was maintained, and the surface crack generation state was periodically observed.
- the test was conducted for a maximum of 72 hours.
- the obtained maleic anhydride-modified polypropylene (B-1) was dissolved in xylene, and then the resulting xylene solution was poured into acetone for reprecipitation and purification.
- the grafting amount of maleic anhydride was determined by IR. It was 0.7 mass% when measured.
- the number average molecular weight (Mn) was Mn 28,000 as measured by GPC.
- polycarbodiimide (A-1) which is a carbodiimide group-containing compound (manufactured by Nisshinbo Chemical Co., Ltd., trade name: Carbodilite HMV-15CA, carbodiimide equivalent 262 g), maleic anhydride-modified polypropylene obtained in Production Example 1 ( B-1), Polypropylene (D-1) (manufactured by Prime Polymer Co., Ltd., trade name Prime Polypro (registered trademark) F113G, MFR: 3.0 g / 10 min) was extruded at the compounding amount (parts by mass) shown in Table 1.
- A-1 is a carbodiimide group-containing compound (manufactured by Nisshinbo Chemical Co., Ltd., trade name: Carbodilite HMV-15CA, carbodiimide equivalent 262 g), maleic anhydride-modified polypropylene obtained in Production Example 1 ( B-1), Polypropylene (D-1) (manufactured by Prime
- polar rubber nitrile rubber C-1 (Nippon Zeon Corporation, Nipol 1042, NBR, Mooney viscosity: 77.5, bound acrylonitrile amount: 33.5, SP value: about 20)
- Plasticizer F-1 (manufactured by ADEKA Corporation, Adekasizer RS-107), additive (H-1) (manufactured by BASF, Irganox® 1010, phenolic antioxidant) and the above composition
- H-1 manufactured by BASF, Irganox® 1010, phenolic antioxidant
- the mixture was introduced into a compounding machine (Kobe Steel Co., Ltd., BB-L3200IM, mixer size: 3.6 L) so as to have a blending amount (parts by mass) shown in Table 1, and melt-kneaded at 120 rpm.
- thermoplastic elastomer composition 1 was about 3 kg / batch.
- the blending amount of polycarbodiimide (A-1) with respect to 100 parts by mass of the total of maleic anhydride-modified polypropylene (B-1) and polypropylene (D-1) was 6.7 parts by mass.
- thermoplastic elastomer composition 1 The obtained molded body sample made of the thermoplastic elastomer composition 1 was observed by SEM (measuring device: JSM-7001F, manufactured by JEOL Ltd., magnification 1000 times), and the average particle size was measured. Further, the obtained thermoplastic elastomer composition 1 was press-molded at 210 ° C. to a thickness of 2 mm and punched into various test shapes as samples, and the physical properties were measured by the above test methods. The results are shown in Table 1. Further, FIG. 1 shows a 1000 ⁇ image by SEM.
- Example 2 As the first stage, polycarbodiimide (A-1) which is a carbodiimide group-containing compound, maleic anhydride-modified polypropylene (B-1) and polypropylene (D-1) obtained in Production Example 1 are blended in the amounts shown in Table 1. In the same manner as in Example 1, the reaction product (contact product) of polycarbodiimide (A-1) and maleic anhydride-modified polypropylene (B-1) and polypropylene (D -1) was obtained.
- Example 1 in the presence of a crosslinking agent (E-1) and a crosslinking auxiliary agent (G-1) as a third stage after being introduced so as to have a blending amount (parts by mass) shown in FIG.
- dynamic crosslinking was performed to obtain a thermoplastic elastomer composition 2.
- the obtained thermoplastic elastomer composition 2 was about 3 kg / batch.
- the blending amount of the polycarbodiimide (A-1) with respect to 100 parts by mass in total of the maleic anhydride-modified polypropylene (B-1) and the polypropylene (D-1) used in the first and second stages is 2. It was 4 parts by mass.
- physical properties of the obtained thermoplastic elastomer composition 2 were measured. The results are also shown in Table 1. Further, FIG. 2 shows a 1000 ⁇ image obtained by SEM.
- Example 3 In Example 2, a polar rubber (C1-1) having a group that reacts with a carbodiimide group at a blending amount (parts by mass) shown in Table 1 in part of the nitrile rubber (C-1) that is a polar rubber (Japan) Thermoplastic in the same manner as in Example 2 except that it was made by Zeon Corporation, Nipol NX775, carboxyl group-containing NBR, Mooney viscosity: 44.0, bound acrylonitrile amount: 26.7, SP value: about 20). Elastomer compositions 3 and 4 were produced and the physical properties were measured. The obtained thermoplastic elastomer compositions 3 and 4 were both about 3 kg / batch. The results are also shown in Table 1. Further, 1000 times images by SEM are shown in FIGS. 3 and 4, respectively.
- Example 5 In Example 4, heat was applied in the same manner as in Example 4 except that the amounts of the crosslinking agent (E-1) and the crosslinking aid (G-1) were changed to the amounts (parts by mass) shown in Table 1.
- a plastic elastomer composition 5 was produced and measured for physical properties. The obtained thermoplastic elastomer composition 5 was about 3 kg / batch. The results are also shown in Table 1.
- FIG. 5 shows a 1000 ⁇ image obtained by SEM.
- Example 6 the blending amounts of polycarbodiimide (A-1) and maleic anhydride-modified polypropylene (B-1) are the amounts (parts by mass) shown in Table 1, and the nitrile rubber (C-1), which is a polar rubber, is used.
- thermoplastic elastomer compositions 6, 8, and 9 were produced in the same manner as in Example 1 except that the amount (part by mass) indicated was used, and the physical properties were measured.
- the obtained thermoplastic elastomer compositions 6, 8 and 9 were all about 3 kg / batch. The results are also shown in Table 1. Further, 1000 times images obtained by SEM are shown in FIGS.
- Example 7 In Example 6, instead of the crosslinking agent (E-1) and the crosslinking assistant (G-1), a crosslinking agent (E-2) (manufactured by SI Group, SP1055F, a phenolic crosslinking agent) and a crosslinking assistant ( G-2) A thermoplastic elastomer composition 7 was produced in the same manner as in Example 6 except that (2 types of zinc oxide manufactured by Hakusui Tech Co., Ltd.) was used in the amount (parts by mass) shown in Table 1. The physical properties were measured. The obtained thermoplastic elastomer composition 7 was about 3 kg / batch. The results are also shown in Table 1. FIG. 7 shows a 1000 ⁇ image obtained by SEM.
- Example 10 In Example 8, the polypropylene (D-1) used in the second stage was changed to polypropylene (D-2) (manufactured by Prime Polymer Co., Ltd., trade name Prime Polypro (registered trademark) J105, MFR: 14.0 g / 10 min).
- a thermoplastic elastomer composition 10 was produced in the same manner as in Example 8 except that the physical properties were changed. The resulting thermoplastic elastomer composition 10 was about 3 kg / batch. The results are also shown in Table 1.
- FIG. 10 shows a 1000 ⁇ image obtained by SEM.
- thermoplastic elastomer compositions 11 to 13 were each about 3 kg / batch. The results are also shown in Table 1. Also, 1000 times images obtained by SEM are shown in FIGS.
- Example 4 the blending of maleic anhydride-modified polypropylene (B-1) and polypropylene (D-1) was changed to the amount (part by mass) shown in Table 1 without performing the first stage blending.
- the second and third stages were blended to produce a thermoplastic elastomer composition 14, and the physical properties were measured.
- the resulting thermoplastic elastomer composition 14 was about 3 kg / batch.
- the results are also shown in Table 1.
- FIG. 14 shows a 1000 ⁇ image obtained by SEM.
- thermoplastic elastomer compositions 1 to 10 obtained in Examples 1 to 10 have a sea-island structure in which the particle diameter of the island phase is smaller than that of the thermoplastic elastomer compositions obtained in Comparative Examples 1 to 3, and the fractures occur. It can be seen that the elongation and breaking strength are large.
- maleic acid-modified polypropylene is known to have a function as a compatibilizer for olefinic resins.
- Comparative Example 4 including this a composition having a sea-island structure in which the particle size of the island phase is small. Although it is obtained, it can be seen that the composition obtained without using the carbodiimide group-containing compound does not have sufficient elongation at break and strength at break.
- thermoplastic elastomer composition having significantly improved elongation at break and breaking strength as compared with Comparative Examples 1 to 4 and excellent oil resistance was obtained.
- the particle size of the island phase is smaller than those in Examples 1 and 2, and each component is highly advanced. It can be seen that they are compatible.
- A-1 which is a carbodiimide group-containing compound (manufactured by Nisshinbo Chemical Co., Ltd., trade name: Carbodilite HMV-15CA, carbodiimide equivalent 262 g)
- maleic anhydride-modified polypropylene obtained in Production Example 1 ( B-1) and polypropylene (D-1) were introduced into an extruder (Nippon Steel Works
- nitrile rubber (C-2) manufactured by NANTEX® industry, Nancar® 1051, NBR, Mooney viscosity: 68, amount of bound acrylonitrile: 41, SP value: about 21
- plasticizer (F-1) Adeka Co., Ltd., Adeka Sizer RS-107
- additive H-1) Phenol-based antioxidant, manufactured by ZEON CORPORATION, amount of
- thermoplastic elastomer compositions 15 and 16 were each about 3 kg / batch. The results are shown in Table 2.
- Example 13 In Example 12, the blending amount (parts by mass) of each component was as shown in Table 2, and the kneading kneader (Kobe Steel Co., Ltd., BB-14IM, mixer size: A thermoplastic elastomer composition 17 was produced in the same manner as in Example 12 except that 14.4L) was used, and the physical properties were measured. The resulting thermoplastic elastomer composition 17 was about 12 kg / batch. The results are shown in Table 2.
- thermoplastic elastomer composition according to the present invention has elasticity, is excellent in oil resistance, chemical resistance, and the like, and also has excellent moldability. Therefore, molded articles in various fields in which elastic molded bodies have been conventionally used. It can be suitably used as a material.
- the molded product obtained from the thermoplastic elastomer composition of the present invention can be used in various applications, for example, rubber for tires, O-rings, industrial rolls, automobile boots (for example, rack and pinion boots, etc.) Fast joint boots), packing (for example, condenser packing), gasket, belt (for example, heat insulation belt, copier belt), hose (for example, water hose, brake reservoir hose, radiator hose), anti-vibration rubber, sponge (for example, weather) Strip sponge, heat insulation sponge, protective sponge, fine foam sponge), cable (ignition cable, cabtire cable, high tension cable), wire covering material (high voltage wire covering material, low voltage wire covering material, marine wire covering material), glass run Channel Over skin material, sheet feed roller, shoe soles, roofing sheets and the like.
- packing for example, condenser packing
- gasket for example, condenser packing
- belt for example, heat insulation belt, copier belt
- hose for example, water hose, brake reservoir hose, radiator hose
- anti-vibration rubber
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Abstract
Description
特許文献1には、エピクロロヒドリンとエチレンオキシドとのコポリマーを未架橋ゴムとして用い、これと結晶性ポリオレフィンとを、塩素化炭化水素の存在下でブレンディングし、その状態で架橋する技術が開示されている。
しかしながら、架橋性ゴムとオレフィン系重合体とがさらに高度に分散され、成形性に優れた熱可塑性エラストマー組成物の出現が求められていた。
〔1〕カルボジイミド基含有化合物(A)、
カルボジイミド基と反応する基を有するオレフィン系重合体(B)、
極性ゴム(C)、および
前記極性ゴム(C)を架橋可能な架橋剤(E)
を、動的に熱処理してなる熱可塑性エラストマー組成物。
〔2〕オレフィン系重合体(D)をさらに含む、前記〔1〕に記載の熱可塑性エラストマー組成物。
〔3〕前記カルボジイミド基含有化合物(A)と、前記カルボジイミド基と反応する基を有するオレフィン系重合体(B)との反応生成物(I)を含有する、前記〔1〕または〔2〕に記載の熱可塑性エラストマー組成物。
〔4〕前記極性ゴム(C)が、カルボジイミド基と反応する基を有する極性ゴム(C1)を含む、前記〔1〕~〔3〕のいずれかに記載の熱可塑性エラストマー組成物。
〔5〕前記カルボジイミド基と反応する基を有する極性ゴム(C1)が、活性水素を有する基を側鎖に有する極性ゴムである、前記〔4〕に記載の熱可塑性エラストマー組成物。
〔6〕前記カルボジイミド基含有化合物(A)と前記カルボジイミド基と反応する基を有する極性ゴム(C1)との反応生成物(II)を含有する、前記〔4〕または〔5〕に記載の熱可塑性エラストマー組成物。
〔7〕前記カルボジイミド基含有化合物(A)が、下記一般式で示される繰り返し単位を有するポリカルボジイミドである、前記〔1〕~〔6〕のいずれかに記載の熱可塑性エラストマー組成物。
-N=C=N-R1-
(式中、R1は2価の有機基を示す。)
〔8〕前記カルボジイミド基と反応する基を有するオレフィン系重合体(B)が、活性水素を有する基を側鎖に有するオレフィン系重合体である、前記〔1〕~〔7〕のいずれかに記載の熱可塑性エラストマー組成物。
〔9〕前記カルボジイミド基と反応する基を有するオレフィン系重合体(B)が、ポリオレフィンと、カルボジイミド基と反応する基を有する化合物とのグラフト共重合体である、前記〔1〕~〔8〕のいずれかに記載の熱可塑性エラストマー組成物。
〔10〕前記オレフィン系重合体(D)が、プロピレン系重合体である、前記〔2〕~〔9〕のいずれかに記載の熱可塑性エラストマー組成物。
〔11〕前記カルボジイミド基と反応する基を有するオレフィン系重合体(B)、前記極性ゴム(C)、および必要に応じて配合されるオレフィン系重合体(D)の合計100質量部に対して、
前記カルボジイミド基含有化合物(A)を0.01~30質量部の範囲で配合してなる、前記〔1〕~〔10〕のいずれかに記載の熱可塑性エラストマー組成物。
〔12〕走査型電子顕微鏡(SEM)による200倍以上の画像で海島構造が観察され、島相の平均粒子径が0.01~20μmである、前記〔1〕~〔11〕のいずれかに記載の熱可塑性エラストマー組成物。
〔13〕前記〔1〕~〔12〕のいずれかに記載の熱可塑性エラストマー組成物を含有する成形体。
〔14〕カルボジイミド基含有化合物(A)、
カルボジイミド基と反応する基を有するオレフィン系重合体(B)、
極性ゴム(C)、
前記極性ゴム(C)を架橋可能な架橋剤(E)、および
を、逐次または同時に、動的に熱処理することを特徴とする熱可塑性エラストマー組成物の製造方法。
〔15〕カルボジイミド基含有化合物(A)とカルボジイミド基と反応する基を有するオレフィン系重合体(B)との反応生成物(I)、
極性ゴム(C)、
前記極性ゴム(C)を架橋可能な架橋剤(E)、および
必要に応じてオレフィン系重合体(D)
を含む配合物を、動的に熱処理することを特徴とする熱可塑性エラストマー組成物の製造方法。
≪熱可塑性エラストマー組成物≫
本発明の熱可塑性エラストマー組成物は、カルボジイミド基含有化合物(A)、カルボジイミド基と反応する基を有するオレフィン系重合体(B)、極性ゴム(C)、必要に応じてオレフィン系重合体(D)、および前記極性ゴム(C)を架橋可能な架橋剤(E)を、動的に熱処理してなる。以下、本発明の熱可塑性エラストマー組成物の原料となる各成分について説明する。
本発明で用いられるカルボジイミド基含有化合物(A)は、-N=C=N-で表されるカルボジイミド基を有する化合物であればよく、特に限定されるものではないが、好ましくは下記一般式で示される繰り返し単位を有するポリカルボジイミドである。
-N=C=N-R1-
〔式中、R1は2価の有機基を示す〕
本発明で用いられる、カルボジイミド基と反応する基を有するオレフィン系重合体(B)は、特に限定されるものではないが、カルボジイミド基と反応する基を有する化合物(b)を用いて、カルボジイミド基と反応する基を、ポリオレフィンに導入することにより得ることができる。
以下に、カルボジイミド基と反応する基を有するオレフィン系重合体(B)を、グラフト共重合で得る場合、ならびにラジカル共重合で得る場合について、具体的に説明する。
本発明に係る、カルボジイミド基と反応する基を有するオレフィン系重合体(B)は、主鎖となる未変性のポリオレフィン(以下、ポリオレフィン主鎖ともいう)に対し、カルボジイミド基と反応する基を有する化合物(b)をグラフト共重合することによって得ることが可能である。
ポリオレフィン主鎖として用いられる未変性のポリオレフィンは、炭素数2~20の脂肪族α-オレフィン、環状オレフィン、非共役ジエンを主成分とする重合体であり、好ましくは炭素数2~10のα-オレフィン、更に好ましくは2~8のα-オレフィンを主成分とする重合体である。これらのオレフィンは、1種単独でも2種以上使用してもよい。本発明においては、エチレン、プロピレン、1-ブテン、4-メチル-1-ペンテン、3-メチル-1-ブテン、1-ヘキセン、1-オクテン、テトラシクロドデセン、ノルボルネンの単独重合体または共重合体を好ましく用いることができる。また、これらはアイソタクチック構造、シンジオタクチック構造の両者ともに使用可能であり、立体規則性についても特段の制限はない。
カルボジイミド基と反応する基を有する化合物(b)としては、カルボジイミド基と反応性を有する活性水素を持つ基を有する化合物が挙げられ、具体的には、カルボン酸、無水カルボン酸、アミン、アルコール、チオール等に由来する基を持つ化合物が挙げられる。すなわち本発明では、カルボジイミド基と反応する基を有するオレフィン系重合体(B)として、たとえば、カルボジイミド基と反応する基として、無水カルボン酸基、カルボキシ基(-COOH)、ヒドロキシ基(-OH)、チオール基(-SH)などの基を有するポリオレフィンが好適に用いられる。
本発明で用いられる、カルボジイミド基と反応する基を有するオレフィン系重合体(B)を、グラフト共重合(グラフト変性)により得る方法としては、主鎖となる上記のポリオレフィン(ポリオレフィン主鎖)に、カルボジイミド基と反応する基を有する化合物(b)を、ラジカル開始剤の存在下、グラフト共重合する方法が挙げられる。このようなグラフト共重合は、カルボジイミド基と反応する基を有する化合物(b)とともに、更に必要に応じてその他のエチレン性不飽和単量体等を共存させて行ってもよい。
本発明で用いる、カルボジイミド基と反応する基を有するオレフィン系重合体(B)は、オレフィンと、カルボジイミド基と反応する基を有する化合物(b)とをラジカル共重合することによっても得ることが可能である。オレフィンとしては、上述のポリオレフィン主鎖を形成する場合のオレフィンと同一のものを採用することが可能であり、また、カルボジイミド基と反応する基を有する化合物(b)としては、グラフト共重合の項において上述したものが用いられる。
オレフィンとカルボジイミド基と反応する基を有する化合物(b)とを共重合させる方法については特に限定されず、従来公知のラジカル共重合法を採用することができる。
本発明で使用されるカルボジイミド基と反応する基を有するオレフィン系重合体(B)は、カルボジイミド基含有化合物(A)とともに用いられて得られる熱可塑性エラストマー組成物中においては、通常少なくとも一部がカルボジイミド基含有化合物(A)と反応し、反応生成物(I)を形成する。本発明に係る熱可塑性エラストマー組成物が、構成する各成分が高度に分散した形態を示し、機械的特性に優れるのは、この反応生成物(I)が熱可塑性エラストマー組成物中において、相容化剤としての作用を示すことが一因であると考えられる。
また本発明においては、カルボジイミド基と反応する基を有するオレフィン系重合体(B)中の、カルボジイミド基と反応する基を有する化合物(b)の含有量が上記範囲であると、カルボジイミド基含有化合物(A)とカルボジイミド基と反応する基を有するオレフィン系重合体(B)との反応生成物(I)の結合部分が生じ、得られる熱可塑性エラストマー組成物中において、相容化剤としての作用を示すため好ましい。
0.1<Mn/{(100-M)*f/M}<6 …(1)
(式(1)中、
f :カルボジイミド基と反応する基を有する化合物(b)の式量(g/mol)
M :カルボジイミド基と反応する基を有する化合物(b)の含有量(化合物(b)に由来する部分の含有量)(質量%)
Mn:カルボジイミド基と反応する基を有するオレフィン系重合体(B)の数平均分子量である。)
0.3<Mn/{(100-M)*f/M}<4 …(2)
0.5<Mn/{(100-M)*f/M}<2.8 …(3)
本発明に使用されるカルボジイミド基と反応する基を有するオレフィン系重合体(B)のASTM D1238による荷重2.16kg、190℃または230℃におけるメルトフローレート(MFR)は、熱可塑性エラストマー組成物を構成する極性ゴム(C)およびオレフィン系重合体(D)の特性にもよるが、通常0.01~500g/10分、好ましくは0.05~300g/10分である。上記範囲にあると、得られる熱可塑性エラストマー組成物中において、極性ゴム(C)とオレフィン系重合体(D)との相容性がより優れたものとなるため好ましい。
極性ゴム(C)としては、極性を有するゴム類を特に制限なく用いることができるが、その分子構造中に炭素(C)と水素(H)のほかに、窒素(N)、酸素(O)、硫黄(S)、ハロゲン(F、Cl、Br等)、リン(P)等の原子を含有する極性基を有するゴムが好ましく、側鎖に極性基を有するゴムがより好ましい。
極性ゴム(C)は、溶解度パラメーター(SP値)が、通常16.5~30(MPa)0.5、好ましくは17~29(MPa)0.5、より好ましくは17.5~28(MPa)0.5であることが望ましい。
極性ゴム(C)は1種単独で用いられてもよく、2種以上組み合わせて用いられてもよい。
本発明に係る極性ゴム(C)は、特に限定されるものではないが、少なくとも一部が架橋剤を用いて架橋可能な、無定形の弾性共重合体であることが好ましい。
本発明の熱可塑性エラストマー組成物においては、極性ゴム(C)は、カルボジイミド基と反応する基を有する極性ゴム(C1)を含有することも好ましい。本発明では、極性ゴム(C)の全量がカルボジイミド基と反応する基を有する極性ゴム(C1)であってもよく、また、極性ゴム(C)の一部がカルボジイミド基と反応する基を有する極性ゴム(C1)であってもよい。ここで、カルボジイミド基と反応する基とは、活性水素を有する基、または水などにより容易に活性水素を有する基に変換される基を意味する。
カルボジイミド基と反応する基を有する極性ゴム(C1)は、1種単独で用いられてもよく、2種以上組み合わせて用いられてもよい。
必要に応じて本発明の熱可塑性エラストマー組成物を構成するオレフィン系重合体(D)は、オレフィンから導かれる構造単位を主として有する重合体あるいは共重合体であって、カルボジイミド基と反応性を有する基を実質的に有さない。カルボジイミド基と反応性を有する基を「実質的に有さない」とは、本発明の熱可塑性エラストマー組成物として調製された状態において、カルボジイミド基含有化合物(A)のカルボジイミド基と実際には反応しないこと、あるいはたとえその基が極少量含まれていたとしても本発明の作用効果への寄与が認められない程度であることを意味する。
オレフィン系重合体(D)としては、上述のカルボジイミド基と反応する基を有するオレフィン系重合体(B)の主鎖である、ポリオレフィン主鎖の項に記載したものと同様のものが例示される。すなわち、本発明で用いられるオレフィン系重合体(D)は、炭素数2~20の脂肪族α-オレフィン、環状オレフィン、非共役ジエンを主成分とする重合体あるいは共重合体であり、好ましくは炭素数2~10のα-オレフィン、更に好ましくは2~8のα-オレフィンを主成分とする重合体あるいは共重合体である。モノマーとなるこれらのオレフィンは、1種単独で用いてもよく、2種以上使用してもよい。コモノマーの含有量は、通常50モル%以下であり、好ましくは40モル%以下、更に好ましくは30モル%以下である。
本発明において、オレフィン系重合体(D)は、通常、熱可塑性を有するポリオレフィン樹脂である。
本発明に係る架橋剤(E)は、前述した極性ゴム(C)を架橋可能な架橋剤である。架橋剤(E)としては、ゴムを架橋する際に一般に使用される種々公知の架橋剤を用いることができる。具体的には、たとえば、有機過酸化物、フェノール樹脂、硫黄系化合物、ヒドロシリコーン系化合物、アミノ樹脂、キノンまたはその誘導体、アミン系化合物、アゾ系化合物、エポキシ系化合物、チオウレア系化合物、チアゾール系化合物、トリアジン系化合物、イソシアネート等の架橋剤が挙げられる。これらのうちでは、有機過酸化物、フェノール樹脂、硫黄系化合物等の架橋剤が好適である。
本発明の熱可塑性エラストマー組成物は、上述したカルボジイミド基含有化合物(A)、カルボジイミド基と反応する基を有するオレフィン系重合体(B)、極性ゴム(C)、オレフィン系重合体(D)および架橋剤(E)以外の成分を、本発明の目的を損なわない範囲で原料として含有してもよい。
本発明の熱可塑性エラストマー組成物は、特に限定されるものではないが、カルボジイミド基と反応する基を有するオレフィン系重合体(B)、極性ゴム(C)、およびオレフィン系重合体(D)の合計100質量部に対して、カルボジイミド基含有化合物(A)を、通常0.01~30質量部、好ましくは0.01~20質量部、さらに好ましくは0.01~15質量部の範囲で用いて得られたものであることが望ましい。
また本発明の熱可塑性エラストマー組成物は、極性ゴム(C)と、カルボジイミド基と反応する基を有するオレフィン系重合体(B)と必要に応じて配合されるオレフィン系重合体(D)の合計との質量比(C):{(B)+(D)}が、通常1:99~99:1、好ましくは5:95~95:5を満たすことが望ましい。
本発明の熱可塑性エラストマー組成物は、上述したカルボジイミド基含有化合物(A)、カルボジイミド基と反応する基を有するオレフィン系重合体(B)、極性ゴム(C)、必要に応じて配合されるオレフィン系重合体(D)および、前記極性ゴム(C)を架橋可能な架橋剤(E)を、動的に熱処理してなる。本発明の熱可塑性エラストマー組成物は、必要に応じて、上述したその他の成分を含有していてもよい。本発明の熱可塑性エラストマー組成物中における各成分の配合割合は、特に限定されるものではなく、好ましくは上述の通りである。
本発明の成形体は、上述した本発明の熱可塑性エラストマー組成物を含有する。本発明の成形体は、本発明の熱可塑性エラストマー組成物を少なくとも一部に含有するものであればよい。
<測定・評価方法>
以下の実施例および比較例において、各性状は以下のようにして測定あるいは評価した。
数平均分子量(Mn)はゲルパーミエーションクロマトグラフィー(GPC)により測定した。Waters社製ゲル浸透クロマトグラフAlliance GPC-2000型を用い、以下のようにして測定した。分離カラムは、TSKgel GMH6-HTを2本およびTSKgel GMH6-HTLを2本使用し、カラムサイズはいずれも直径7.5mm、長さ300mmであり、カラム温度は140℃とし、移動相にはo-ジクロロベンゼン(和光純薬工業)および酸化防止剤としてBHT(武田薬品)0.025重量%を用い、1.0ml/分で移動させ、試料濃度は15mg/10mLとし、試料注入量は500マイクロリットルとし、検出器として示差屈折計を用いた。標準ポリスチレンは、分子量がMw<1000およびMw>4×106については東ソー社製を用い、1000≦Mw≦4×106についてはプレッシャーケミカル社製を用いた。無水マレイン酸変性ポリプロピレンにおいては、ポリプロピレン換算により算出した。
破断強度(TB)(MPa)、破断伸び(EB)(%)
熱可塑性エラストマー組成物を210℃でプレス成形して、縦200mm、横200mm、厚さ2mmのプレスシートを作製し、このプレスシートを打ち抜いてダンベル状(JIS-3号)試験片を作製した。JIS K6251(2010)に準拠して、この試験片を用いて引張速度500mm/minで引張り強さ(TB)および伸び(EB)を測定した。
熱可塑性エラストマー組成物からプレス成形機により作製したプレス成形シートを、JIS K6262に準拠して、スペーサーを用いて25%圧縮し、70℃で24時間熱処理を行い、処理後23℃の恒温室で30分放置した後、厚さを測定し、下記式から圧縮永久歪(CS)を求めた。
CS=[(t0-t1)/(t0-t2)]×100
CS:圧縮永久歪み率(%)
t0:プレス成形シートの原厚(mm)
t1: 30分放置した後のプレス成形シートの厚さ(mm)
t2:圧縮ひずみを加えた状態でのプレス成形シートの厚さ(mm)
四酸化ルテニウムを用いて樹脂成分を染色したサンプルを、走査型電子顕微鏡(測定装置:日本電子株式会社製JSM-7001F)を用いて、500~3000倍に拡大して得た画像を解析した。
解析は画像解析ソフトImageJを用いて二値化処理をし、解析した。この画像中のポリプロピレン樹脂と、極性ゴム粒子の占有域を特定した。
特定された粒子の占有域の一つ毎を画像解析により、その面積を算出した。そして、その面積と等しい面積の真円の直径を求め、それぞれの占有域について求めた値を算術平均したものを粒子の平均粒子径の測定値とした。すなわち、各粒子の粒子径は各粒子の面積Sを求め、Sを用いて、(4S/π)0.5を各粒子の粒子径とした。
JIS K6253に準拠して、厚さ2mmのプレスシートを用いてショアー硬度計(A硬度計)により測定した。
JIS K7204に準拠して、厚さ2mmのプレスシートを試験形状に打ち抜いたものを試験片として用いて、CS-17摩耗輪を使用して、9.8N、60rpm、1000回の条件で実施し、摩耗質量(mg)を測定した。
JIS K6258に準拠して、IRM903号油を用い、125℃、72時間の条件で実施し、浸漬試験後の体積変化率ΔV(%)を求めた。
JIS K6261に準拠して、厚さ2mmのプレスシートを試験形状に打ち抜いたものを試験片として用いて、ゲーマンねじり試験によりねじり剛性の評価を行った。熱媒体としてはエタノールを使用し、測定は5℃間隔で実施し、t10(比モジュラス(180-x)/xが常温におけるそれの10倍になる温度)を求めた。
厚さ2mmのプレスシートから30mm×30mmに切り出した試験片をFuel C(イソオクタン/トルエン=50/50mass%)またはCE20(エタノール/イソオクタン/トルエン=20/40/40mass%)に、それぞれ、温度40℃で72時間浸漬し、試験前後の体積から体積変化率(%)を算出した。
約10mlのFuel C(イソオクタン/トルエン=50/50mass%)またはCE20(エタノール/イソオクタン/トルエン=20/40/40mass%)を30mmφのSUS製の特殊カップ(透過面積7.07cm2)に入れ、厚さ2mmのプレスシートから作成した試験片を蓋にして密閉した。プレスシートの代わりにアルミ製の蓋で同量のFuel CまたはCE20を密閉したブランク補正用カップと供に温度40℃±2℃、湿度0%RHに保たれた窒素雰囲気下に保持し、定期的(1回/日)に重量変化を測定した。試験は連続144時間以上実施し、ブランク補正カップの数値を差し引いた数値を各時間における重量変化量として求めた。得られた重量変化量を時間に対してプロットし、その直線の傾き/透過面積から透過度(g/(m2・24h))を算出した。さらに測定に用いたプレスシートの厚みの実測値(mm)×透過度から、透過係数(g・mm/(m2・24h))を求めた。
JIS K6259の静的オゾン劣化試験に準拠して、厚さ2mmのプレスシートから打ち抜いた試験片(JIS K 6251規定 ダンベル状1号形)を温度40±2℃、オゾン濃度50±5pphm雰囲気中において、ひずみ20%を負荷した状態で保持し、定期的に表面の亀裂発生状態を観察した。試験は最長で72時間まで実施した。
<無水マレイン酸変性ポリプロピレン(B-1)の製造>
ポリプロピレン1(株式会社プライムポリマー製、商品名プライムポリプロ(登録商標)F327)100質量部に、無水マレイン酸(富士フイルム和光純薬株式会社製)1質量部、2,5-ジメチル-2,5-ビス(tert-ブチルパーオキシ)ヘキシン-3(日油株式会社製、商品名パーヘキシン25B)0.25質量部を混合し、二軸混練機(株式会社日本製鋼所製、TEX-30、L/D=40、真空ベント使用)を用いてシリンダー温度220℃、スクリュー回転数200rpm、吐出量80g/分にて押し出し、無水マレイン酸変性ポリプロピレン(B-1)を得た。得られた、無水マレイン酸変性ポリプロピレン(B-1)をキシレンに溶解し、次いで得られたキシレン溶液をアセトンに注ぐことで、再沈させて精製し、無水マレイン酸のグラフト量をIRにて測定したところ0.7質量%であった。また、数平均分子量(Mn)はGPCにて測定したところ、Mn28,000であった。
第一段階として、カルボジイミド基含有化合物であるポリカルボジイミド(A-1)(日清紡ケミカル株式会社製、商品名:カルボジライトHMV-15CA、カルボジイミド当量262g)、製造例1で得た無水マレイン酸変性ポリプロピレン(B-1)、ポリプロピレン(D-1)(株式会社プライムポリマー製、商品名プライムポリプロ(登録商標)F113G、MFR:3.0g/10min)を、表1に示す配合量(質量部)で押出機(株式会社日本製鋼所製、TEX44、L/D=70)に導入し、シリンダー温度290℃、スクリュー回転数760rpm、吐出量1.33kg/分で溶融混練し、ポリカルボジイミド(A-1)と無水マレイン酸変性ポリプロピレン(B-1)との反応生成物(接触物)と、ポリプロピレン(D-1)とを含む組成物を得た。
第一段階として、カルボジイミド基含有化合物であるポリカルボジイミド(A-1)、製造例1で得た無水マレイン酸変性ポリプロピレン(B-1)、ポリプロピレン(D-1)を、表1に示す配合量(質量部)で押出機に導入し、実施例1と同様にしてポリカルボジイミド(A-1)と無水マレイン酸変性ポリプロピレン(B-1)との反応生成物(接触物)と、ポリプロピレン(D-1)とを含む組成物を得た。
実施例2において、極性ゴムであるニトリルゴム(C-1)の一部を、表1に示す配合量(質量部)で、カルボジイミド基と反応する基を有する極性ゴム(C1-1)(日本ゼオン株式会社製、Nipol NX775、カルボキシル基含有NBR、ムーニー粘度:44.0、結合アクリロニトリル量:26.7、SP値:約20)としたことの他は、実施例2と同様にして熱可塑性エラストマー組成物3、4を製造し、物性を測定した。得られた熱可塑性エラストマー組成物3および4は、いずれも約3kg/バッチであった。結果を表1に併せて示す。また、SEMによる1000倍画像を図3および図4にそれぞれ示す。
実施例4において、架橋剤(E-1)および架橋助剤(G-1)の配合量を、表1に示す量(質量部)としたことの他は、実施例4と同様にして熱可塑性エラストマー組成物5を製造し、物性を測定した。得られた熱可塑性エラストマー組成物5は約3kg/バッチであった。結果を表1に併せて示す。また、SEMによる1000倍画像を図5に示す。
実施例2において、ポリカルボジイミド(A-1)、無水マレイン酸変性ポリプロピレン(B-1)の配合量を表1に示す量(質量部)とし、極性ゴムであるニトリルゴム(C-1)の一部を、表1に示す配合量(質量部)で、カルボジイミド基と反応する基を有する極性ゴム(C1-1)(日本ゼオン株式会社製、Nipol NX775、カルボキシル基含有NBR、ムーニー粘度:44.0、結合アクリロニトリル量:26.7、SP値:約20)とし、可塑剤(F-1)、架橋剤(E-1)、架橋助剤(G-1)の配合量を表1に示す量(質量部)としたことの他は、実施例1と同様にして熱可塑性エラストマー組成物6、8、9をそれぞれ製造し、物性を測定した。得られた熱可塑性エラストマー組成物6、8および9は、いずれも約3kg/バッチであった。結果を表1に併せて示す。また、SEMによる1000倍画像を図6、8、9にそれぞれ示す。
実施例6において、架橋剤(E-1)および架橋助剤(G-1)に代えて、架橋剤(E-2)(SI Group社製、SP1055F、フェノール系架橋剤)および架橋助剤(G-2)(ハクスイテック株式会社製、酸化亜鉛2種)を、表1に示す配合量(質量部)で用いたことの他は、実施例6と同様にして熱可塑性エラストマー組成物7を製造し、物性を測定した。得られた熱可塑性エラストマー組成物7は約3kg/バッチであった。結果を表1に併せて示す。また、SEMによる1000倍画像を図7に示す。
実施例8において、第二段階で用いたポリプロピレン(D-1)を、ポリプロピレン(D-2)(株式会社プライムポリマー製、商品名プライムポリプロ(登録商標)J105、MFR:14.0g/10min)に変更したことの他は、実施例8と同様にして熱可塑性エラストマー組成物10を製造し、物性を測定した。得られた熱可塑性エラストマー組成物10は約3kg/バッチであった。結果を表1に併せて示す。また、SEMによる1000倍画像を図10に示す。
実施例2、4、7において、第一段階の配合を行わず、ポリプロピレン(D-1)の配合量を表1に示す量(質量部)としたことの他は、実施例2、4、7とそれぞれ同様にして、第二段階、第三段階の配合を行い、熱可塑性エラストマー組成物11~13をそれぞれ製造し、物性を測定した。得られた熱可塑性エラストマー組成物11~13は、それぞれ約3kg/バッチであった。結果を表1に併せて示す。また、SEMによる1000倍画像を図11~13にそれぞれ示す。
実施例2において、第一段階の配合を行わず、無水マレイン酸変性ポリプロピレン(B-1)およびポリプロピレン(D-1)の配合量を表1に示す量(質量部)としたことの他は、実施例2と同様にして第二段階、第三段階の配合を行い、熱可塑性エラストマー組成物14を製造し、物性を測定した。得られた熱可塑性エラストマー組成物14は約3kg/バッチであった。結果を表1に併せて示す。また、SEMによる1000倍画像を図14に示す。
第一段階として、カルボジイミド基含有化合物であるポリカルボジイミド(A-1)(日清紡ケミカル株式会社製、商品名:カルボジライトHMV-15CA、カルボジイミド当量262g)、製造例1で得た無水マレイン酸変性ポリプロピレン(B-1)、ポリプロピレン(D-1)を、表2に示す配合量(質量部)で押出機(株式会社日本製鋼所製、TEX44、L/D=70)に導入し、シリンダー温度290℃、スクリュー回転数760rpm、吐出量1.33kg/分で溶融混練し、ポリカルボジイミド(A-1)と無水マレイン酸変性ポリプロピレン(B-1)との反応生成物(接触物)と、ポリプロピレン(D-1)とを含む組成物を得た。
実施例12において、各成分の配合量(質量部)を表2に示す通りとし、第二段階での混練に、噛合い式混練機(株式会社神戸製鋼所製、BB-14IM、ミキサーサイズ:14.4L)を用いたことの他は、実施例12と同様にして、熱可塑性エラストマー組成物17を製造し、物性を測定した。得られた熱可塑性エラストマー組成物17は約12kg/バッチであった。結果を表2に示す。
Claims (15)
- カルボジイミド基含有化合物(A)、
カルボジイミド基と反応する基を有するオレフィン系重合体(B)、
極性ゴム(C)、および
前記極性ゴム(C)を架橋可能な架橋剤(E)
を、動的に熱処理してなる熱可塑性エラストマー組成物。 - オレフィン系重合体(D)をさらに含む、請求項1に記載の熱可塑性エラストマー組成物。
- 前記カルボジイミド基含有化合物(A)と、前記カルボジイミド基と反応する基を有するオレフィン系重合体(B)との反応生成物(I)を含有する、請求項1または2に記載の熱可塑性エラストマー組成物。
- 前記極性ゴム(C)が、カルボジイミド基と反応する基を有する極性ゴム(C1)を含む、請求項1~3のいずれかに記載の熱可塑性エラストマー組成物。
- 前記カルボジイミド基と反応する基を有する極性ゴム(C1)が、活性水素を有する基を側鎖に有する極性ゴムである、請求項4に記載の熱可塑性エラストマー組成物。
- 前記カルボジイミド基含有化合物(A)と前記カルボジイミド基と反応する基を有する極性ゴム(C1)との反応生成物(II)を含有する、請求項4または5に記載の熱可塑性エラストマー組成物。
- 前記カルボジイミド基含有化合物(A)が、下記一般式で示される繰り返し単位を有するポリカルボジイミドである、請求項1~6のいずれかに記載の熱可塑性エラストマー組成物。
-N=C=N-R1-
(式中、R1は2価の有機基を示す。) - 前記カルボジイミド基と反応する基を有するオレフィン系重合体(B)が、活性水素を有する基を側鎖に有するオレフィン系重合体である、請求項1~7のいずれかに記載の熱可塑性エラストマー組成物。
- 前記カルボジイミド基と反応する基を有するオレフィン系重合体(B)が、ポリオレフィンと、カルボジイミド基と反応する基を有する化合物とのグラフト共重合体である、請求項1~8のいずれかに記載の熱可塑性エラストマー組成物。
- 前記オレフィン系重合体(D)が、プロピレン系重合体である、請求項2~9のいずれかに記載の熱可塑性エラストマー組成物。
- 前記カルボジイミド基と反応する基を有するオレフィン系重合体(B)、前記極性ゴム(C)、および必要に応じて配合されるオレフィン系重合体(D)の合計100質量部に対して、
前記カルボジイミド基含有化合物(A)を0.01~30質量部の範囲で配合してなる、請求項1~10のいずれかに記載の熱可塑性エラストマー組成物。 - 走査型電子顕微鏡(SEM)による200倍以上の画像で海島構造が観察され、島相の平均粒子径が0.01~20μmである、請求項1~11のいずれかに記載の熱可塑性エラストマー組成物。
- 請求項1~12のいずれかに記載の熱可塑性エラストマー組成物を含有する成形体。
- カルボジイミド基含有化合物(A)、
カルボジイミド基と反応する基を有するオレフィン系重合体(B)、
極性ゴム(C)、
前記極性ゴム(C)を架橋可能な架橋剤(E)、および
必要に応じてオレフィン系重合体(D)
を、逐次または同時に、動的に熱処理することを特徴とする熱可塑性エラストマー組成物の製造方法。 - カルボジイミド基含有化合物(A)とカルボジイミド基と反応する基を有するオレフィン系重合体(B)との反応生成物(I)、
極性ゴム(C)、
前記極性ゴム(C)を架橋可能な架橋剤(E)、および
必要に応じてオレフィン系重合体(D)
を含む配合物を、動的に熱処理することを特徴とする熱可塑性エラストマー組成物の製造方法。
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| JP2020521680A JP6970824B2 (ja) | 2018-05-28 | 2019-01-31 | 熱可塑性エラストマー組成物及びその製造方法 |
| CN201980035655.3A CN112166150B (zh) | 2018-05-28 | 2019-01-31 | 热塑性弹性体组合物及其制造方法 |
| US17/056,053 US20210214541A1 (en) | 2018-05-28 | 2019-01-31 | Thermoplastic elastomer composition and method for producing the same |
| EP19812234.3A EP3805308B1 (en) | 2018-05-28 | 2019-01-31 | Thermoplastic elastomer composition and production method therefor |
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| JP2018101568 | 2018-05-28 | ||
| JP2018-101568 | 2018-05-28 |
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| WO2019230047A1 true WO2019230047A1 (ja) | 2019-12-05 |
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| EP (1) | EP3805308B1 (ja) |
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| WO (1) | WO2019230047A1 (ja) |
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| JP2019206695A (ja) * | 2018-05-28 | 2019-12-05 | 三井化学株式会社 | 樹脂組成物及びその製造方法 |
| JP2023060216A (ja) * | 2020-03-27 | 2023-04-27 | 旭化成株式会社 | カルボジイミド組成物、硬化剤組成物、塗料組成物及び樹脂硬化物 |
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- 2019-01-31 WO PCT/JP2019/003467 patent/WO2019230047A1/ja not_active Ceased
- 2019-01-31 CN CN201980035655.3A patent/CN112166150B/zh active Active
- 2019-01-31 JP JP2020521680A patent/JP6970824B2/ja active Active
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| JP2023060216A (ja) * | 2020-03-27 | 2023-04-27 | 旭化成株式会社 | カルボジイミド組成物、硬化剤組成物、塗料組成物及び樹脂硬化物 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112166150A (zh) | 2021-01-01 |
| EP3805308A1 (en) | 2021-04-14 |
| JPWO2019230047A1 (ja) | 2021-05-20 |
| EP3805308B1 (en) | 2025-11-05 |
| JP6970824B2 (ja) | 2021-11-24 |
| US20210214541A1 (en) | 2021-07-15 |
| EP3805308A4 (en) | 2022-03-09 |
| CN112166150B (zh) | 2023-03-10 |
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