WO2017115847A1 - エチレン-ビニルアルコール系共重合体組成物および多層構造体 - Google Patents
エチレン-ビニルアルコール系共重合体組成物および多層構造体 Download PDFInfo
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- WO2017115847A1 WO2017115847A1 PCT/JP2016/089122 JP2016089122W WO2017115847A1 WO 2017115847 A1 WO2017115847 A1 WO 2017115847A1 JP 2016089122 W JP2016089122 W JP 2016089122W WO 2017115847 A1 WO2017115847 A1 WO 2017115847A1
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- Prior art keywords
- evoh resin
- resin composition
- ethylene
- vinyl
- acid
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/12—Making granules characterised by structure or composition
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F216/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F216/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an alcohol radical
- C08F216/04—Acyclic compounds
- C08F216/06—Polyvinyl alcohol ; Vinyl alcohol
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/02—Wrappers or flexible covers
- B65D65/16—Wrappers or flexible covers with provision for excluding or admitting light
- B65D65/20—Wrappers or flexible covers with provision for excluding or admitting light with provision for excluding light of a particular wavelength
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/10—Metal compounds
- C08K3/11—Compounds containing metals of Groups 4 to 10 or of Groups 14 to 16 of the Periodic Table
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2800/00—Copolymer characterised by the proportions of the comonomers expressed
- C08F2800/10—Copolymer characterised by the proportions of the comonomers expressed as molar percentages
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0856—Iron
Definitions
- the present invention relates to an EVOH resin composition containing as a main component an ethylene-vinyl alcohol copolymer (hereinafter sometimes abbreviated as “EVOH resin”), and a multilayer structure using the same. More specifically, the present invention relates to an EVOH resin composition having ultraviolet absorbing ability and a multilayer structure having at least one layer containing such an EVOH resin composition.
- EVOH resin ethylene-vinyl alcohol copolymer
- EVOH resin is excellent in transparency, gas barrier properties such as oxygen, aroma retention, solvent resistance, oil resistance, mechanical strength, etc., molded into films, sheets, bottles, etc., food packaging materials, pharmaceutical packaging materials, Widely used as various packaging materials such as industrial chemical packaging materials and agricultural chemical packaging materials.
- an ultraviolet absorber is generally blended in a resin used as a packaging material.
- a laminated structure in which layers made of polyolefin and EVOH resin are laminated, a laminated structure that reduces the transmittance of ultraviolet rays by kneading an ultraviolet absorber into a part or all of the layers is proposed. (For example, refer to Patent Document 1).
- UV absorbers are generally low molecular weight compounds, they can easily migrate through the resin after forming a molded product, and can move to the layer surface during use and come into contact with the contents or make the surface sticky. It had the problem that. Moreover, in order to obtain sufficient ultraviolet absorbing ability, it is necessary to mix
- the present invention provides an EVOH resin composition and a multilayer structure having good ultraviolet absorptivity without blending a known ultraviolet absorber.
- an EVOH resin composition having an iron compound content of 0.01 to 100 ppm in terms of metal per weight of the EVOH resin composition has a good ultraviolet absorbing ability.
- the present invention relates to an EVOH resin composition containing an EVOH resin and an iron compound, wherein the content of the iron compound is 0.01 to 100 ppm in terms of metal per weight of the EVOH resin composition.
- the composition is the first gist.
- this invention makes the 2nd summary the multilayer structure which has at least 1 layer containing the said EVOH resin composition.
- the EVOH resin composition of the present invention has a good ultraviolet absorbing ability without using an ultraviolet absorber that may cause surface migration or resin property inhibition, packaging of contents that may be deteriorated or deteriorated by ultraviolet rays. It can be suitably used for the material.
- a multilayer structure having at least one layer containing the EVOH resin composition of the present invention is particularly useful as a packaging material for foods because of its excellent ultraviolet absorbing ability.
- the EVOH resin composition of the present invention comprises an EVOH resin as a main component and contains an iron compound in an amount of 0.01 to 100 ppm in terms of metal per weight of the EVOH resin composition.
- the base resin is an EVOH resin. That is, the EVOH resin content in the EVOH resin composition is usually 90% by weight or more, preferably 95% by weight or more, and preferably 97% by weight or more. Each component will be described below.
- the EVOH resin used in the present invention is usually a resin obtained by saponifying an ethylene-vinyl ester copolymer, which is a copolymer of ethylene and a vinyl ester monomer, and is a water-insoluble thermoplastic resin. It is.
- the vinyl ester monomer vinyl acetate is generally used from the economical aspect.
- the polymerization can also be carried out using any known polymerization method such as solution polymerization, suspension polymerization, and emulsion polymerization. Generally, solution polymerization using methanol as a solvent is used. Saponification of the obtained ethylene-vinyl ester copolymer can also be performed by a known method.
- the EVOH resin produced in this way is mainly composed of ethylene-derived structural units and vinyl alcohol structural units, and contains a slight amount of vinyl ester structural units remaining without saponification.
- vinyl ester monomer vinyl acetate is typically used from the viewpoint of market availability and good impurity treatment efficiency during production.
- examples of other vinyl ester monomers include, for example, fats such as vinyl formate, vinyl propionate, vinyl valerate, vinyl butyrate, vinyl isobutyrate, vinyl pivalate, vinyl caprate, vinyl laurate, vinyl stearate, and vinyl versatate.
- Aromatic vinyl esters such as aromatic vinyl esters and vinyl benzoates, and the like.
- aliphatic vinyl esters having 3 to 20 carbon atoms, preferably 4 to 10 carbon atoms, and particularly preferably 4 to 7 carbon atoms are used. It can. These are usually used alone, but a plurality of them may be used simultaneously as necessary.
- the content of the ethylene structural unit in the EVOH resin can be controlled by the pressure of ethylene when the vinyl ester monomer and ethylene are copolymerized, and is usually 20 to 60 mol%, preferably 25 to 50 mol%, particularly Preferably, it is 25 to 35 mol%.
- this ethylene content can be measured based on ISO14663.
- the degree of saponification of the vinyl ester component in the EVOH resin is the amount, temperature, time, etc. of the saponification catalyst (usually an alkaline catalyst such as sodium hydroxide is used) when saponifying the ethylene-vinyl ester copolymer. And is usually 90 to 100 mol%, preferably 95 to 100 mol%, particularly preferably 99 to 100 mol%. When the degree of saponification is too low, gas barrier properties, thermal stability, moisture resistance and the like tend to decrease.
- the degree of saponification of the EVOH resin can be measured based on JIS K6726 (however, the EVOH resin is a solution uniformly dissolved in water / methanol solvent).
- the melt flow rate (MFR) (210 ° C., load 2,160 g) of the EVOH resin is usually 0.5 to 100 g / 10 minutes, preferably 1 to 50 g / 10 minutes, particularly preferably 3 to 35 g. / 10 minutes.
- MFR serves as an index of the degree of polymerization of the EVOH resin, and can be adjusted by the amount of polymerization initiator and the amount of solvent when copolymerizing ethylene and a vinyl ester monomer.
- the EVOH resin used in the present invention may further contain structural units derived from the following comonomer within a range not inhibiting the effects of the present invention (for example, 10 mol% or less).
- the comonomer include olefins such as propylene, 1-butene and isobutene, 3-buten-1-ol, 3-butene-1,2-diol, 4-penten-1-ol, and 5-hexene-1,2.
- hydroxy group-containing ⁇ -olefins such as diols, esterified products and acylated products thereof; hydroxyalkylvinylidenes such as 2-methylenepropane-1,3-diol and 3-methylenepentane-1,5-diol; Hydroxyalkyl vinylidene diacetates such as 1,3-diacetoxy-2-methylenepropane, 1,3-dipropionyloxy-2-methylenepropane, 1,3-dibutyronyloxy-2-methylenepropane; acrylic acid, methacrylic acid Acid, crotonic acid, (anhydrous) phthalic acid, (anhydrous) maleic acid, (anhydrous) itaconic acid Unsaturated acids or salts thereof or mono- or dialkyl esters having 1 to 18 carbon atoms; acrylamide, N-alkyl acrylamide, N, N-dimethylacrylamide, 2-acrylamidopropanes
- Vinyl silanes such as trimethoxyvinyl silane; allyl halide compounds such as allyl acetate and allyl chloride; allyl alcohols such as allyl alcohol and dimethoxyallyl alcohol; trimethyl- (3-acrylamido-3-dimethyl) And a comonomer such as propyl) -ammonium chloride and acrylamido-2-methylpropanesulfonic acid. These may be used alone or in combination of two or more.
- post-modified EVOH-based resins such as urethanization, acetalization, cyanoethylation, oxyalkyleneation and the like can also be used.
- an EVOH resin copolymerized with a hydroxy group-containing ⁇ -olefin is preferable from the viewpoint of good secondary moldability, and among them, an EVOH resin having a 1,2-diol in the side chain is preferable.
- the EVOH resin used in the present invention may be a mixture with other different EVOH resins.
- examples of such other EVOH resins include those having different degrees of saponification, those having different degrees of polymerization, and copolymerization components. You can give something different.
- the EVOH resin composition of the present invention is characterized in that the iron compound content is 0.01 to 100 ppm in terms of metal per weight of the EVOH resin composition.
- the content of such an iron compound is particularly preferably 1 to 80 ppm, more preferably 3 to 70 ppm, and particularly preferably 10 to 50 ppm. If the content of the iron compound is too small, the ultraviolet absorbing ability tends to be insufficient, and conversely if it is too large, the molded product tends to be colored.
- the content of the iron compound is obtained by adding pure water to a solution obtained by acid-treating an EVOH resin composition containing an EVOH resin and an iron compound with dilute sulfuric acid or hydrochloric acid, and adding a constant volume. Can be measured with an atomic absorption photometer.
- Such an iron compound may be used in the EVOH resin composition, for example, ferric oxide, ferric tetroxide, ferrous chloride, ferric chloride, ferrous hydroxide, ferric hydroxide, suboxide.
- ferric oxide ferric oxide, ferric tetroxide, ferrous chloride, ferric chloride, ferrous hydroxide, ferric hydroxide, suboxide.
- iron salt such as iron, iron sulfate, or iron phosphate
- it may be present in an ionized state or in the form of a complex formed as a resin or other ligand.
- the EVOH resin composition (pellet) of the present invention for example, (i) in the EVOH resin production process, after the iron compound is contained in a uniform solution (water / alcohol solution, etc.) of the EVOH resin , A method of extruding into a coagulating liquid in the form of a strand, then cutting the resulting strand into a pellet, and further drying this, (ii) contacting the EVOH resin pellet with an aqueous solution containing an iron compound, A method in which an iron compound is contained in an EVOH resin pellet and then dried; (iii) a method in which EVOH resin pellets and an iron compound are dry-blended and then melt-kneaded; and (iv) a predetermined amount of EVOH resin in a molten state.
- Examples thereof include a method of adding an iron compound and melt-kneading.
- the method (ii) is preferably used in that a resin composition having a more remarkable effect of the present invention can be obtained and a new production process is not added.
- the EVOH resin composition pellets obtained by the method (i) and the EVOH resin pellets used in the methods (ii) and (iii) include, for example, a spherical shape, a cylindrical shape, a cubic shape, a rectangular parallelepiped shape, and the like.
- it is spherical (rugby ball shape) or cylindrical, and its size is usually 1 to 6 mm, preferably 2 to 5 mm in the case of a spherical shape from the viewpoint of convenience when used as a molding material later.
- the height is usually 1 to 6 mm, preferably 2 to 5 mm.
- the bottom diameter is usually 1 to 6 mm, preferably 2 to 5 mm
- the length is usually 1 to 6 mm, preferably 2 to 5 mm.
- a water-soluble iron compound is used, for example, ferric oxide, iron tetroxide, ferrous chloride And iron salts (inorganic acid salts, etc.) such as ferric chloride, ferrous hydroxide, ferric hydroxide, ferrous oxide, iron sulfate, iron sulfide, iron nitrate, and iron phosphate.
- iron salts inorganic acid salts, etc.
- the iron compound exists in the EVOH resin in the ionized state or in the state of a complex having a resin or another compound as a ligand, in addition to the case where it exists as the salt. Also good.
- an aqueous solution containing the iron compound used in the above method (ii) an aqueous solution of the iron compound or one in which iron ions are eluted by immersing the steel material in water containing various chemicals is used. Can do.
- the iron compound content (converted to metal) in the EVOH resin composition can be controlled by the concentration, immersion temperature, immersion time, etc. of the iron compound in the aqueous solution in which the EVOH resin pellets are immersed. .
- the soaking temperature and soaking time are usually 0.5 to 48 hours, preferably 1 to 36 hours, and the temperature is usually 10 to 40 ° C., preferably 20 to 35 ° C.
- Such EVOH resin composition pellets are solid-liquid separated by a known method and dried by a known drying method. As such a drying method, various drying methods can be adopted, and static drying, fluidized drying, and combinations thereof can be performed.
- the water content of the EVOH resin composition pellets of the present invention is usually 0.01 to 0.5% by weight, preferably 0.05 to 0.35% by weight, particularly preferably 0.1 to 0.3% by weight. %.
- the moisture content of the EVOH resin composition pellet in the present invention is measured and calculated by the following method.
- the EVOH resin composition pellet was weighed (W 1 ) with an electronic balance, dried in a hot air drier at 150 ° C. for 5 hours, weighed after being allowed to cool for 30 minutes in a desiccator (W 2 ), and Calculate from the formula.
- Water content (% by weight) [(W 1 ⁇ W 2 ) / W 1 ] ⁇ 100
- the pellets of the EVOH resin composition thus obtained can be subjected to melt molding as they are, but it is also preferable to attach a lubricant to the surface of the pellets in terms of stabilizing the feed property at the time of melt molding.
- the types of lubricants include higher fatty acids (for example, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, etc.), higher fatty acid esters (higher fatty acid methyl esters, isopropyl esters, butyl esters, octyl esters, etc.) Higher fatty acid amides (saturated aliphatic amides such as stearic acid amide and behenic acid amide, unsaturated fatty acid amides such as oleic acid amide and erucic acid amide, ethylene bis stearic acid amide, ethylene bis oleic acid amide, ethylene biserucic acid amide Bis-fatty acid
- Higher fatty acids and esters and amides thereof are preferably used, and higher fatty acid amides are more preferably used.
- the content of such a lubricant is usually 5% by weight or less, preferably 1% by weight or less of the EVOH resin composition.
- the EVOH resin composition of the present invention may contain a compounding agent that is generally blended with the EVOH resin as long as the effects of the present invention are not impaired.
- the multilayer structure of the present invention has at least one layer containing the EVOH resin composition of the present invention.
- the layer containing the EVOH resin composition of the present invention (hereinafter simply referred to as “EVOH resin composition layer”) is another substrate (hereinafter referred to as “base”) containing a thermoplastic resin other than the EVOH resin composition of the present invention as a main component.
- the resin used for the material may be abbreviated as “base resin.”) To provide further strength, protect the EVOH resin composition layer from the influence of moisture, etc. Can be granted.
- the base resin examples include linear low density polyethylene, low density polyethylene, ultra low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-propylene (block and random) copolymer, and ethylene- ⁇ -olefin.
- Polyethylene resins such as ( ⁇ -olefin having 4 to 20 carbon atoms) copolymer, polypropylene resins such as polypropylene and propylene- ⁇ -olefin ( ⁇ -olefin having 4 to 20 carbon atoms) copolymer, polybutene, polypentene (Unmodified) polyolefin resins such as polycyclic olefin resins (polymers having a cyclic olefin structure in at least one of the main chain and side chain), and these polyolefins are graft-modified with unsaturated carboxylic acids or esters thereof Unsaturated carboxylic acid modified polyolefin resin Polyolefin resin, ionomer, ethylene-vinyl
- polyamide resins, polyolefin resins, polyester resins, and polystyrene resins, which are hydrophobic resins, are preferable, and polyethylene resins, polypropylene resins, polycyclic olefin resins, and unsaturated thereof are more preferable.
- Polyolefin resins such as carboxylic acid-modified polyolefin resins, and particularly polycyclic olefin resins are preferably used as hydrophobic resins.
- the layer structure of the multilayer structure is a / b. , B / a / b, a / b / a, a1 / a2 / b, a / b1 / b2, b2 / b1 / a / b1 / b2, b2 / b1 / a / b1 / a / b1 / b2, etc. Combinations of these are possible.
- the EVOH resin composition of the present invention obtained by remelt molding an edge portion or defective product generated in the process of producing the multilayer structure and a thermoplastic resin other than the EVOH resin composition of the present invention
- the recycled layer containing the mixture is R, b / R / a, b / R / a / b, b / R / a / R / b, b / a / R / a / b, b / R / a / R / a / R / b or the like is also possible.
- the number of layers of the multilayer structure is generally 2 to 15, preferably 3 to 10, in total.
- an adhesive resin layer containing an adhesive resin may be interposed between the respective layers as necessary.
- the adhesive resin known resins can be used, and may be appropriately selected according to the kind of the thermoplastic resin used for the base resin “b”.
- a typical example is a modified polyolefin polymer containing a carboxyl group obtained by chemically bonding an unsaturated carboxylic acid or its anhydride to a polyolefin resin by an addition reaction or a graft reaction.
- maleic anhydride graft modified polyethylene maleic anhydride graft modified polypropylene, maleic anhydride graft modified ethylene-propylene (block and random) copolymer, maleic anhydride graft modified ethylene-ethyl acrylate copolymer, maleic anhydride graft
- examples thereof include a modified ethylene-vinyl acetate copolymer, a maleic anhydride-modified polycyclic olefin resin, and a maleic anhydride graft-modified polyolefin resin. And 1 type, or 2 or more types of mixtures chosen from these can be used.
- the adhesive resin layer is at least one layer located on both sides of the EVOH resin composition layer. Therefore, it is preferable to use an adhesive resin having excellent hydrophobicity.
- plasticizers, fillers, clays, and the like that are conventionally known within a range not impairing the gist of the present invention (for example, 30% by weight or less, preferably 10% by weight or less). Montmorillonite, etc.), colorants, antioxidants, antistatic agents, lubricants, core materials, antiblocking agents, waxes and the like.
- Lamination (including the case where an adhesive resin layer is interposed) of the EVOH resin composition of the present invention and the base resin can be performed by a known method.
- a method of melt extrusion laminating a base resin on a film or sheet of the EVOH resin composition of the present invention a method of melt extrusion laminating the EVOH resin composition of the present invention on a base resin layer, an EVOH resin composition and a base
- a method of co-extrusion with a base resin, and an EVOH resin composition (layer) and a base resin (layer) are dry-laminated using a known adhesive such as an organic titanium compound, an isocyanate compound, a polyester compound, or a polyurethane compound. Examples thereof include a method, a method of removing a solvent after coating a solution of an EVOH resin composition on a base resin, and the like.
- the co-extrusion method is preferable from the viewpoint of cost and environment.
- the multilayer structure as described above is then subjected to (heating) stretching treatment as necessary.
- the stretching treatment may be either uniaxial stretching or biaxial stretching, and in the case of biaxial stretching, it may be simultaneous stretching or sequential stretching.
- a roll stretching method a tenter stretching method, a tubular stretching method, a stretching blow method, a vacuum / pressure forming method, or the like having a high stretching ratio can be employed.
- the stretching temperature is a temperature in the vicinity of the melting point of the multilayer structure, and is usually selected from the range of about 40 to 170 ° C., preferably about 60 to 160 ° C. If the stretching temperature is too low, the stretchability becomes poor, and if it is too high, it becomes difficult to maintain a stable stretched state.
- the heat setting can be performed by a known means.
- the stretched film is usually heat-treated at 80 to 180 ° C., preferably 100 to 165 ° C. for about 2 to 600 seconds while keeping the stretched state.
- the above heat setting is not performed, for example, cold air is applied to the stretched film. It is sufficient to perform a process such as fixing by cooling.
- a cup or tray-like multilayer container using the multilayer structure of the present invention.
- a drawing method usually a drawing method is employed, and specific examples include a vacuum forming method, a pressure forming method, a vacuum pressure forming method, a plug assist type vacuum forming method.
- a blow molding method is employed.
- extrusion blow molding methods double-headed, mold moving, parison shift, rotary, accumulator, horizontal parison, etc.
- cold parison blow molding injection blow molding, biaxial stretching
- blow molding method extruded cold parison biaxial stretch blow molding method, injection cold parison biaxial stretch blow molding method, injection molding inline biaxial stretch blow molding method, and the like.
- the obtained laminate is subjected to heat treatment, cooling treatment, rolling treatment, printing treatment, dry lamination treatment, solution or melt coating treatment, bag making processing, deep drawing processing, box processing, tube processing, split processing, etc. as necessary. Can do.
- the thickness of the multilayer structure (including stretched ones) and the thickness of the EVOH resin composition layer, the base resin layer and the adhesive resin layer constituting the multilayer structure are the layer configuration, the type of base resin, and the adhesion.
- the thickness of the multilayer structure (including the stretched one) is usually 10 to 5000 ⁇ m, preferably 30 to 3000 ⁇ m, particularly preferably, although it cannot be generally stated depending on the type, usage, packaging form, and required physical properties of the resin. 50 to 2000 ⁇ m.
- the EVOH resin composition layer is usually 1 to 500 ⁇ m, preferably 3 to 300 ⁇ m, particularly preferably 5 to 200 ⁇ m, and the base resin layer is usually 5 to 30000 ⁇ m, preferably 10 to 20000 ⁇ m, particularly preferably 20 to 10000 ⁇ m.
- the adhesive resin layer is usually 0.5 to 250 ⁇ m, preferably 1 to 150 ⁇ m, particularly preferably 3 to 100 ⁇ m.
- the ratio of the thickness of the EVOH resin composition layer to the base resin layer in the multilayer structure is the ratio of the thickest layers when there are a plurality of layers.
- the ratio is usually 1/99 to 50/50, preferably 5/95 to 45/55, particularly preferably 10/90 to 40/60.
- the thickness ratio of the EVOH resin composition layer to the adhesive resin layer in the multilayer structure is the ratio of the thickest layers when there are a plurality of layers.
- the ratio is 10/90 to 99/1, preferably 20/80 to 95/5, particularly preferably 50/50 to 90/10.
- Containers and lids made of bags, cups, trays, tubes, bottles, etc. made of films, sheets, stretched films, and the like obtained as described above are seasonings such as mayonnaise and dressing, miso, etc. It is useful as a container for various packaging materials for fermented foods, fats and oils such as salad oil, beverages, cosmetics, and pharmaceuticals.
- the layer made of the EVOH resin composition of the present invention is particularly useful as a packaging material for foodstuffs, particularly meat such as meat, ham, and winner, where discoloration due to ultraviolet rays is likely to be a problem because of its excellent ultraviolet absorbing ability.
- Iron pieces 60 mm x 60 mm x 990 mm SS400 plate: manufactured by Daido DM Solution Co., Ltd.
- an aqueous solution of additives aqueous solution containing 206 ppm acetic acid, 206 ppm sodium dihydrogen phosphate, 28 ppm calcium phosphate, 280 ppm sodium acetate, 117 ppm boric acid.
- an aqueous solution having 30 ppm of iron compound in terms of metal was obtained.
- EVOH resin hydrous pellets EVOH resin
- EVOH resin composition pellets were obtained by drying at 118 ° C. for 14 hours.
- a water / isopropanol (4/6) solution having a concentration of 5% by weight was prepared using the obtained EVOH resin composition pellets. Then, the ultraviolet transmittance (wavelength 300 nm) of the solution was measured using UV-VIS SPECTROTOPOMETER (“UV-2600” manufactured by SHIMAZU). The measurement results are shown in Table 1.
- Example 2 In Example 1, the time for bringing the iron piece into contact with the aqueous solution of the additive was 3 hours, and the content of the iron compound in the aqueous solution in which the EVOH resin pellets were immersed was 6 ppm in terms of metal, the same as in Example 1.
- EVOH resin composition pellets were prepared. The iron compound content (metal conversion) per weight of the EVOH resin composition pellets was measured. Further, the EVOH resin composition pellets were made into a water / isopropanol solution having a concentration of 5% by weight in the same manner as in Example 1, and the ultraviolet transmittance of the solution was measured. The measurement results are shown in Table 1.
- Example 1 EVOH resin composition pellets were produced in the same manner as in Example 1 except that the iron pieces were not brought into contact with the aqueous solution of the additive and the iron compound was not contained in the aqueous solution in which the EVOH resin pellets were immersed.
- This EVOH resin composition pellet was made into a water / isopropanol solution in the same manner as in Example 1, and the ultraviolet transmittance of the solution was measured. The measurement results are shown in Table 1.
- the products of Examples 1 and 2 using the EVOH resin composition pellets of the present invention containing a predetermined amount of an iron compound have a lower ultraviolet transmittance than the product of Comparative Example 1 containing no iron compound. It was excellent in absorption capacity.
- the EVOH resin composition of the present invention can be suitably used as a packaging material for foods, medicines and the like because it has a good ultraviolet absorbing ability without blending a general ultraviolet absorber.
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Abstract
Description
包装材に紫外線吸収性を付与する方法としては、包装材料として用いられる樹脂中に紫外線吸収剤を配合することが一般的である。例えば、ポリオレフィンとEVOH樹脂からなる層を積層した積層構造体において、その一部の層、または全ての層に紫外線吸収剤を練りこむことで、紫外線の透過率を低減させた積層構造体が提案されている(例えば、特許文献1参照)。
また、充分な紫外線吸収能を得るには、多量の紫外線吸収剤を樹脂中に配合する必要があり、その結果、樹脂特性を低下させる傾向がある。
すなわち、本発明は、EVOH樹脂と鉄化合物とを含有するEVOH樹脂組成物であって、鉄化合物の含有量がEVOH樹脂組成物の重量あたり、金属換算にて0.01~100ppmであるEVOH樹脂組成物を第1の要旨とする。
また、本発明は、上記EVOH樹脂組成物を含有する層を少なくとも1層有する多層構造体を第2の要旨とする。
以下に各成分について説明する。
本発明で用いるEVOH樹脂は、通常、エチレンとビニルエステル系モノマーとの共重合体であるエチレン-ビニルエステル系共重合体をケン化させることにより得られる樹脂であり、非水溶性の熱可塑性樹脂である。上記ビニルエステル系モノマーとしては、経済的な面から、一般的には酢酸ビニルが用いられる。
重合法も公知の任意の重合法、例えば、溶液重合、懸濁重合、エマルジョン重合を用いて行うことができるが、一般的にはメタノールを溶媒とする溶液重合が用いられる。得られたエチレン-ビニルエステル系共重合体のケン化も公知の方法で行い得る。
このようにして製造されるEVOH樹脂は、エチレン由来の構造単位とビニルアルコール構造単位を主とし、ケン化されずに残存した若干量のビニルエステル構造単位を含む。
なお、かかるエチレン含有量は、ISO14663に基づいて測定することができる。
かかるEVOH樹脂のケン化度は、JIS K6726(ただし、EVOH樹脂は水/メタノール溶媒に均一に溶解した溶液にて)に基づいて測定することができる。
かかるMFRは、EVOH樹脂の重合度の指標となるものであり、エチレンとビニルエステル系モノマーを共重合する際の重合開始剤の量や、溶媒の量によって調整することができる。
前記コモノマーとしては、プロピレン、1-ブテン、イソブテン等のオレフィン類、3-ブテン-1-オール、3-ブテン-1,2-ジオール、4-ペンテン-1-オール、5-ヘキセン-1,2-ジオール等のヒドロキシ基含有α-オレフィン類やそのエステル化物、アシル化物などの誘導体;2-メチレンプロパン-1,3-ジオール、3-メチレンペンタン-1,5-ジオール等のヒドロキシアルキルビニリデン類;1,3-ジアセトキシ-2-メチレンプロパン、1,3-ジプロピオニルオキシ-2-メチレンプロパン、1,3-ジブチロニルオキシ-2-メチレンプロパン等のヒドロキシアルキルビニリデンジアセテート類;アクリル酸、メタクリル酸、クロトン酸、(無水)フタル酸、(無水)マレイン酸、(無水)イタコン酸等の不飽和酸類あるいはその塩あるいは炭素数1~18のモノまたはジアルキルエステル類;アクリルアミド、炭素数1~18のN-アルキルアクリルアミド、N,N-ジメチルアクリルアミド、2-アクリルアミドプロパンスルホン酸あるいはその塩、アクリルアミドプロピルジメチルアミンあるいはその酸塩あるいはその4級塩等のアクリルアミド類;メタアクリルアミド、炭素数1~18のN-アルキルメタクリルアミド、N,N-ジメチルメタクリルアミド、2-メタクリルアミドプロパンスルホン酸あるいはその塩、メタクリルアミドプロピルジメチルアミンあるいはその酸塩あるいはその4級塩等のメタクリルアミド類;N-ビニルピロリドン、N-ビニルホルムアミド、N-ビニルアセトアミド等のN-ビニルアミド類;アクリルニトリル、メタクリルニトリル等のシアン化ビニル類;炭素数1~18のアルキルビニルエーテル、ヒドロキシアルキルビニルエーテル、アルコキシアルキルビニルエーテル等のビニルエーテル類;塩化ビニル、塩化ビニリデン、フッ化ビニル、フッ化ビニリデン、臭化ビニル等のハロゲン化ビニル化合物類;トリメトキシビニルシラン等のビニルシラン類;酢酸アリル、塩化アリル等のハロゲン化アリル化合物類;アリルアルコール、ジメトキシアリルアルコール等のアリルアルコール類;トリメチル-(3-アクリルアミド-3-ジメチルプロピル)-アンモニウムクロリド、アクリルアミド-2-メチルプロパンスルホン酸等のコモノマーがあげられる。これらは単独でもしくは2種以上併せて用いることができる。
本発明のEVOH樹脂組成物は、鉄化合物の含有量が、EVOH樹脂組成物の重量あたり金属換算にて0.01~100ppmであることを特徴とするものである。かかる鉄化合物の含有量は、特に好ましくは1~80ppm、さらに好ましくは3~70ppm、殊に好ましくは10~50ppmである。
鉄化合物の含有量が少なすぎると紫外線吸収能が不充分となる傾向があり、逆に多すぎると成形物が着色する傾向がある。
中でも、本発明の効果がより顕著な樹脂組成物が得られ、かつ、新たな製造工程を加えることが無い点で、(ii)の方法が好ましく用いられる。
かかるEVOH樹脂組成物ペレットは公知の手法にて固液分離し、公知の乾燥方法にて乾燥する。かかる乾燥方法として、種々の乾燥方法を採用することが可能であり、静置乾燥、流動乾燥およびこれらを組み合わせて行うことができる。
EVOH樹脂組成物ぺレットを電子天秤にて秤量(W1)し、150℃の熱風乾燥機中で5時間乾燥させ、デシケーター中で30分間放冷後の重量を秤量(W2)し、下記式より算出する。
含水率(重量%)=[(W1-W2)/W1]×100
本発明の多層構造体は、上記本発明のEVOH樹脂組成物を含む層を少なくとも1層有するものである。本発明のEVOH樹脂組成物を含む層(以下、単に「EVOH樹脂組成物層」という)は、本発明のEVOH樹脂組成物以外の熱可塑性樹脂を主成分とする他の基材(以下、基材に用いられる樹脂を「基材樹脂」と略記することがある。)と積層することで、さらに強度を付与したり、EVOH樹脂組成物層を水分等の影響から保護したり、他の機能を付与することができる。
上記の層構成において、それぞれの層間には、必要に応じて接着性樹脂を含有する接着性樹脂層を介層してもよい。
また、本発明のEVOH樹脂組成物から得られた多層延伸フィルムをシュリンク用フィルムとして用いる場合には、熱収縮性を付与するために、上記の熱固定を行わず、例えば延伸後のフィルムに冷風を当てて冷却固定するなどの処理を行えばよい。
特に、本発明のEVOH樹脂組成物からなる層は、紫外線吸収能が優れるため、食品、特には紫外線による変色が問題となりやすい精肉、ハム、ウィンナー等の畜肉用の包装材料として特に有用である。
尚、例中「部」とあるのは、断りのない限り重量基準を意味する。
鉄片(60mm×60mm×990mmのSS400のプレート:大同DMソリューション社製)を、添加物の水溶液(酢酸206ppm、リン酸二水素ナトリウム206ppm、リン酸カルシウム28ppm、酢酸ナトリウム280ppm、ホウ酸117ppm含む水溶液)へ24時間接触させることで、鉄化合物を金属換算にて30ppm有する水溶液を得た。この鉄化合物を含む添加物の水溶液に、エチレン構造単位の含有量44モル%、ケン化度99.6モル%、MFR12g/10分(210℃、荷重2160g)、EVOH樹脂の含水ペレット(EVOH樹脂ペレット)を接触(浸漬)させることにより、上記添加物と鉄化合物を上記EVOH樹脂ペレット中に含有させた。この後、118℃で14時間乾燥させることにより、EVOH樹脂組成物ペレットを得た。
測定結果を表1に示す。
実施例1において、鉄片を添加物の水溶液と接触させる時間を3時間とし、EVOH樹脂ペレットを浸漬する水溶液中の鉄化合物の含有量を金属換算で6ppmとした以外は実施例1と同様にして、EVOH樹脂組成物ペレットを作製した。
このEVOH樹脂組成物ペレットの重量あたりの鉄化合物の含有量(金属換算)を測定した。また、このEVOH樹脂組成物ペレットを実施例1と同様に、濃度5重量%の水/イソプロパノール溶液とし、その溶液の紫外線透過率を測定した。
測定結果を表1に示す。
実施例1において、鉄片を添加物の水溶液と接触させず、EVOH樹脂ペレットを浸漬する水溶液中に鉄化合物を含有させなかった以外は実施例1と同様にEVOH樹脂組成物ペレットを作製した。このEVOH樹脂組成物ペレットを実施例1と同様に水/イソプロパノール溶液とし、その溶液の紫外線透過率を測定した。
測定結果を表1に示す。
Claims (2)
- エチレン-ビニルアルコール系共重合体と鉄化合物とを含有するエチレン-ビニルアルコール系共重合体組成物であって、鉄化合物の含有量がエチレン-ビニルアルコール系共重合体組成物の重量あたり、金属換算にて0.01~100ppmであることを特徴とするエチレン-ビニルアルコール系共重合体組成物。
- 請求項1記載のエチレン-ビニルアルコール系共重合体組成物を含有する層を少なくとも1層有することを特徴とする多層構造体。
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| US16/064,307 US11186666B2 (en) | 2015-12-28 | 2016-12-28 | Ethylene-vinyl alcohol copolymer composition pellets, and multilayer structure |
| SG11201804720PA SG11201804720PA (en) | 2015-12-28 | 2016-12-28 | Ethylene-vinyl alcohol copolymer composition and multilayer structure |
| JP2016575983A JP7066968B2 (ja) | 2015-12-28 | 2016-12-28 | エチレン-ビニルアルコール系共重合体組成物ペレットおよび多層構造体 |
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| WO2019004260A1 (ja) * | 2017-06-27 | 2019-01-03 | 日本合成化学工業株式会社 | エチレン-ビニルアルコール系共重合体組成物、ペレットおよび多層構造体 |
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| JP2019007005A (ja) * | 2017-06-27 | 2019-01-17 | 日本合成化学工業株式会社 | 樹脂組成物、溶融成形用材料および多層構造体 |
| US11242451B2 (en) | 2017-06-27 | 2022-02-08 | Mitsubishi Chemical Corporation | Melt-formable ethylene-vinyl alcohol copolymer composition, pellets, and multilayer structure |
| US11384184B2 (en) | 2017-06-27 | 2022-07-12 | Mitsubishi Chemical Corporation | Melt-formable ethylene-vinyl alcohol copolymer composition, pellets, and multilayer structure |
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| US11384184B2 (en) | 2017-06-27 | 2022-07-12 | Mitsubishi Chemical Corporation | Melt-formable ethylene-vinyl alcohol copolymer composition, pellets, and multilayer structure |
| US11512190B2 (en) | 2017-06-27 | 2022-11-29 | Mitsubishi Chemical Corporation | Ethylene-vinyl alcohol copolymer composition, pellets, and multilayer structure |
| US11613642B2 (en) | 2017-06-27 | 2023-03-28 | Mitsubishi Chemical Corporation | Ethylene-vinyl alcohol copolymer composition, pellets, and multilayer structure |
| JP7425394B2 (ja) | 2017-06-27 | 2024-01-31 | 三菱ケミカル株式会社 | 樹脂組成物、溶融成形用材料および多層構造体 |
| US12473421B2 (en) | 2017-06-27 | 2025-11-18 | Mitsubishi Chemical Corporation | Ethylene-vinyl alcohol copolymer composition, pellets, and multilayer structure |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201736481A (zh) | 2017-10-16 |
| JPWO2017115847A1 (ja) | 2018-10-18 |
| US11186666B2 (en) | 2021-11-30 |
| CN108473747A (zh) | 2018-08-31 |
| US20190002612A1 (en) | 2019-01-03 |
| EP3398990A4 (en) | 2019-10-02 |
| JP7066968B2 (ja) | 2022-05-16 |
| EP3398990B1 (en) | 2026-01-07 |
| EP3398990A1 (en) | 2018-11-07 |
| SG11201804720PA (en) | 2018-07-30 |
| TWI771282B (zh) | 2022-07-21 |
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