WO2022220007A1 - 熱可塑性ポリイミド樹脂組成物及び成形品 - Google Patents
熱可塑性ポリイミド樹脂組成物及び成形品 Download PDFInfo
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- WO2022220007A1 WO2022220007A1 PCT/JP2022/012143 JP2022012143W WO2022220007A1 WO 2022220007 A1 WO2022220007 A1 WO 2022220007A1 JP 2022012143 W JP2022012143 W JP 2022012143W WO 2022220007 A1 WO2022220007 A1 WO 2022220007A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1042—Copolyimides derived from at least two different tetracarboxylic compounds or two different diamino compounds
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- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1003—Preparatory processes
- C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
- C08G73/101—Preparatory processes from tetracarboxylic acids or derivatives and diamines containing chain terminating or branching agents
- C08G73/1017—Preparatory processes from tetracarboxylic acids or derivatives and diamines containing chain terminating or branching agents in the form of (mono)amine
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- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1075—Partially aromatic polyimides
- C08G73/1082—Partially aromatic polyimides wholly aromatic in the tetracarboxylic moiety
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- 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
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
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- C08K7/00—Use of ingredients characterised by shape
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- C08K7/10—Silicon-containing compounds
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—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 a halogen; Compositions of derivatives of such polymers
- C08L27/02—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 a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—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 a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08L27/18—Homopolymers or copolymers or tetrafluoroethene
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K2003/343—Peroxyhydrates, peroxyacids or salts thereof
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- C—CHEMISTRY; METALLURGY
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- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/06—Elements
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/30—Applications used for thermoforming
Definitions
- the present invention relates to thermoplastic polyimide resin compositions and molded articles.
- polyimide resin Due to the rigidity of the molecular chain, resonance stabilization, and strong chemical bonding, polyimide resin is a useful engineering plastic with high thermal stability, high strength, and high solvent resistance, and is applied in a wide range of fields. Polyimide resins having crystallinity can further improve their heat resistance, strength and chemical resistance, and thus are expected to be used as metal substitutes. However, although the polyimide resin has high heat resistance, it does not show thermoplasticity and has a problem of low moldability.
- Patent Document 1 As polyimide molding materials, highly heat-resistant resin Vespel (registered trademark) and the like are known (Patent Document 1). Since it is necessary to perform molding, it is also disadvantageous in terms of cost. On the other hand, a resin such as a crystalline resin that has a melting point and is fluid at high temperatures can be molded easily and inexpensively.
- thermoplastic polyimide resins have been reported.
- Thermoplastic polyimide resins are excellent in moldability in addition to the inherent heat resistance of polyimide resins. Therefore, thermoplastic polyimide resins can also be applied to moldings used in harsh environments where general-purpose thermoplastic resins such as nylon and polyester could not be applied.
- Patent Document 2 a predetermined A thermoplastic polyimide resin is disclosed that contains a repeating unit of
- Patent Document 3 a flame-retardant polyimide containing a semi-aromatic polyimide resin and a predetermined amount of either graphite or a combination of two or more selected from the group consisting of graphite, fluororesin, and carbon fiber A molding material is disclosed. Further, in Patent Document 4, a polyimide resin composition containing a thermoplastic polyimide resin containing a predetermined repeating unit and a fluororesin that satisfies predetermined requirements is easy to mold, has high slidability and good appearance. It is disclosed that it is possible to produce a compacted product.
- the polyimide resin composition described in Patent Document 4 further contains at least one selected from the group consisting of carbon fiber and graphite for the purpose of improving various properties such as slidability, mechanical strength, and flame retardancy. It is stated that it can contain However, when the polyimide resin composition contains carbon fiber or graphite, the specific wear tends to increase, and there is room for further improvement in this respect. In particular, in the prior art, it was difficult to reduce the specific wear amount while keeping the coefficient of dynamic friction at a low level among the indices of slidability.
- the subject of the present invention is a thermoplastic polyimide resin composition capable of producing a highly slidable molded article having a high rigidity, a low coefficient of dynamic friction and a small amount of specific wear, and molding containing the thermoplastic polyimide resin composition It is about providing goods.
- thermoplastic polyimide resin A resin composition containing predetermined amounts of thermoplastic polyimide resin, carbon fiber, fluororesin, and inorganic filler can solve the above problems. That is, the present invention relates to the following.
- Thermoplastic polyimide resin A 30 to 60% by mass, carbon fiber (B) 5 to 50% by mass, fluororesin (C) 5 to 20% by mass, and inorganic filler (D) 1 to 40% by mass
- a thermoplastic polyimide resin composition containing % A molded article containing the thermoplastic polyimide resin composition described in [1] above.
- thermoplastic polyimide resin composition of the present invention it is possible to produce a highly slidable molded product with high rigidity, a low coefficient of dynamic friction, and a small amount of specific wear.
- the resin composition and molded article are suitable for applications requiring excellent rigidity and sliding properties, such as bearings for automobiles, bearings for copiers, etc., gears, bearings, bushes, mechanical seals, and transmission seals. etc. is suitably used.
- thermoplastic polyimide resin composition of the present invention is a thermoplastic polyimide resin (A) 30 to 60% by mass, carbon fiber (B) 5 to 50% by mass, fluorine It contains 5 to 20% by mass of resin (C) and 1 to 40% by mass of inorganic filler (D).
- thermoplastic polyimide resin composition of the present invention a highly slidable molded article having high rigidity, a low coefficient of dynamic friction and a small amount of specific wear can be produced.
- the flexural modulus is used as an index for "rigidity”
- the flexural strength is used as an index for "mechanical strength” or “strength”.
- the slidability is indexed by the coefficient of dynamic friction and the amount of specific wear, and the lower the coefficient of dynamic friction and the amount of specific wear, the higher the slidability.
- thermoplastic polyimide resin composition of the present invention achieves the above effect.
- the composition of the present invention has thermoplasticity and relatively high heat resistance and slidability as a thermoplastic resin composition.
- the carbon fiber (B) contributes to rigidity
- the fluororesin (C) contributes to improvement of slidability.
- predetermined amounts of these in the composition of the present invention high rigidity and slidability can be imparted.
- the molded article made of the resin composition containing the carbon fiber (B) has improved rigidity, the specific wear amount tends to increase even if the molded article contains the fluororesin (C).
- the composition of the present invention further contains a predetermined amount of the inorganic filler (D), thereby improving the hardness of the resulting molded article, thereby suppressing an increase in the specific wear loss.
- thermoplastic polyimide resin (A) (hereinafter also simply referred to as "component (A)") used in the present invention is thermoplastic, and preferably in the form of powder or pellets.
- the thermoplastic polyimide resin is formed by closing the imide ring after molding in the state of a polyimide precursor such as polyamic acid, for example, a polyimide resin having no glass transition temperature (Tg), or a temperature lower than the glass transition temperature It is distinguished from polyimide resin that decomposes at
- component (A) examples include wholly aromatic thermoplastic polyimide resins, semi-aromatic thermoplastic polyimide resins, and aliphatic thermoplastic polyimide resins.
- wholly aromatic thermoplastic polyimide resins include thermoplastic polyimide resins mainly containing repeating structural units derived from an aromatic tetracarboxylic acid component and an aromatic diamine component.
- An aromatic tetracarboxylic acid or its derivative can be used as the aromatic tetracarboxylic acid component.
- Commercially available wholly aromatic thermoplastic polyimide resins include, for example, "AURUM” manufactured by Mitsui Chemicals, Inc.
- thermoplastic polyimide resin a thermoplastic polyimide resin mainly containing repeating structural units derived from an aromatic tetracarboxylic acid component and an aliphatic diamine component, and derived from an aliphatic tetracarboxylic acid component and an aromatic diamine component and a thermoplastic polyimide resin mainly containing repeating structural units.
- the aliphatic diamine component may be either a chain aliphatic diamine or an aliphatic diamine containing a cyclic structure.
- aliphatic tetracarboxylic acid component a chain aliphatic tetracarboxylic acid, an aliphatic tetracarboxylic acid containing a cyclic structure, and derivatives thereof (anhydrides or alkyl esters) can be used.
- thermoplastic polyimide resins examples include thermoplastic polyimide resins that mainly contain repeating structural units derived from an aliphatic tetracarboxylic acid component and an aliphatic diamine component.
- the aliphatic tetracarboxylic acid component and the aliphatic diamine component are the same as above.
- mainly containing refers to the total of repeating structural units derived from the tetracarboxylic acid component and the diamine component, which constitute the main chain of the polyimide resin, preferably 50 to 100 mol%, more preferably 75 to 100 mol %, more preferably 80 to 100 mol %, still more preferably 85 to 100 mol %, and may contain other structural units as necessary.
- a semi-aromatic thermoplastic polyimide resin is preferable, and a repeating structural unit derived from an aromatic tetracarboxylic acid component and an aliphatic diamine component.
- the component (A) contains a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), and the repeating structural unit of the formula (1) and the repeating structural unit of the formula (2) ) is a polyimide resin (A1) in which the content ratio of the repeating structural unit of the formula (1) is 20 to 70 mol % with respect to the total repeating structural units of (A1).
- R 1 is a C 6-22 divalent aliphatic group containing at least one alicyclic hydrocarbon structure.
- R 2 is a C 5-16 divalent chain aliphatic group.
- X 1 and X 2 are each independently a tetravalent aromatic group having 6 to 22 carbon atoms.
- the polyimide resin will be simply referred to as “polyimide resin (A1)", and details will be described with the polyimide resin (A1) as an example.
- R 1 is a C 6-22 divalent aliphatic group containing at least one alicyclic hydrocarbon structure.
- the alicyclic hydrocarbon structure means a ring derived from an alicyclic hydrocarbon compound, and the alicyclic hydrocarbon compound may be saturated or unsaturated, and It may be cyclic or polycyclic.
- Examples of the alicyclic hydrocarbon structure include, but are not limited to, cycloalkane rings such as cyclohexane ring, cycloalkene rings such as cyclohexene, bicycloalkane rings such as norbornane ring, and bicycloalkene rings such as norbornene. Do not mean.
- a cycloalkane ring is preferred, a cycloalkane ring having 4 to 7 carbon atoms is more preferred, and a cyclohexane ring is even more preferred.
- R 1 has 6 to 22 carbon atoms, preferably 8 to 17 carbon atoms.
- R 1 contains at least one, preferably 1 to 3, alicyclic hydrocarbon structures.
- R 1 is preferably a divalent group represented by the following formula (R1-1) or (R1-2).
- (m 11 and m 12 are each independently an integer of 0 to 2, preferably 0 or 1, more preferably 1;
- m 13 to m 15 are each independently an integer of 0 to 2; Yes, preferably 0 or 1.)
- R 1 is particularly preferably a divalent group represented by the following formula (R1-3).
- R1-3 the positional relationship of the two methylene groups with respect to the cyclohexane ring may be cis or trans, and the ratio of cis to trans may be can be any value.
- X 1 is a tetravalent aromatic group having 6 to 22 carbon atoms.
- the aromatic ring in the aromatic group may be a single ring or a condensed ring, and examples include, but are not limited to, benzene ring, naphthalene ring, anthracene ring, and tetracene ring. Among these, benzene ring and naphthalene ring are preferred, and benzene ring is more preferred.
- X 1 has 6 to 22 carbon atoms, preferably 6 to 18 carbon atoms.
- X 1 contains at least one, preferably 1 to 3, aromatic rings.
- X 1 is preferably a tetravalent group represented by any one of formulas (X-1) to (X-4) below.
- R 11 to R 18 are each independently an alkyl group having 1 to 4 carbon atoms;
- p 11 to p 13 are each independently an integer of 0 to 2, preferably 0;
- p 14 , p 15 , p 16 and p 18 are each independently an integer of 0 to 3, preferably 0.
- p 17 is an integer of 0 to 4, preferably 0.
- L 11 to L 13 are each independently a single bond, an ether group, a carbonyl group or an alkylene group having 1 to 4 carbon atoms.) Since X 1 is a tetravalent aromatic group having 6 to 22 carbon atoms, R 12 , R 13 , p 12 and p 13 in formula (X-2) are represented by formula (X-2). is selected so that the number of carbon atoms in the tetravalent aromatic group is within the range of 10 to 22. Similarly, L 11 , R 14 , R 15 , p 14 and p 15 in formula (X-3) are tetravalent aromatic groups having 12 to 22 carbon atoms.
- X 1 is particularly preferably a tetravalent group represented by the following formula (X-5) or (X-6).
- R 2 is a divalent chain aliphatic group having 5 to 16 carbon atoms, preferably 6 to 14 carbon atoms, more preferably 7 to 12 carbon atoms, still more preferably 8 to 10 carbon atoms.
- the chain aliphatic group means a group derived from a chain aliphatic compound, the chain aliphatic compound may be saturated or unsaturated, straight-chain It may be single or branched, and may contain a heteroatom such as an oxygen atom.
- R 2 is preferably an alkylene group having 5 to 16 carbon atoms, more preferably an alkylene group having 6 to 14 carbon atoms, still more preferably an alkylene group having 7 to 12 carbon atoms, and most preferably an alkylene group having 8 to 10 carbon atoms. It is an alkylene group.
- the alkylene group may be a straight-chain alkylene group or a branched alkylene group, but is preferably a straight-chain alkylene group.
- R 2 is preferably at least one selected from the group consisting of octamethylene group and decamethylene group, and particularly preferably octamethylene group.
- R 2 is a divalent chain aliphatic group having 5 to 16 carbon atoms containing an ether group.
- the number of carbon atoms is preferably 6 to 14 carbon atoms, more preferably 7 to 12 carbon atoms, still more preferably 8 to 10 carbon atoms.
- a divalent group represented by the following formula (R2-1) or (R2-2) is preferred.
- (m 21 and m 22 are each independently an integer of 1 to 15, preferably 1 to 13, more preferably 1 to 11, still more preferably 1 to 9.
- m 23 to m 25 are each independently an integer of 1 to 14, preferably 1 to 12, more preferably 1 to 10, and even more preferably 1 to 8.) Since R 2 is a divalent chain aliphatic group having 5 to 16 carbon atoms (preferably 6 to 14 carbon atoms, more preferably 7 to 12 carbon atoms, still more preferably 8 to 10 carbon atoms), m 21 and m 22 in formula (R2-1) are divalent groups represented by formula (R2-1) having 5 to 16 carbon atoms (preferably 6 to 14 carbon atoms, more preferably 7 carbon atoms to 12, more preferably 8 to 10 carbon atoms). That is, m 21 +m 22 is 5 to 16 (preferably 6 to 14, more preferably 7 to 12, still more preferably 8 to 10).
- m 23 to m 25 in formula (R2-2) are divalent groups represented by formula (R2-2) having 5 to 16 carbon atoms (preferably 6 to 14 carbon atoms, more preferably It is selected to fall within the range of 7 to 12 carbon atoms, more preferably 8 to 10 carbon atoms. That is, m 23 +m 24 +m 25 is 5 to 16 (preferably 6 to 14 carbon atoms, more preferably 7 to 12 carbon atoms, still more preferably 8 to 10 carbon atoms).
- X2 is defined in the same manner as X1 in Formula ( 1 ), and the preferred embodiments are also the same.
- the content ratio of the repeating structural unit of formula (1) to the total of the repeating structural unit of formula (1) and the repeating structural unit of formula (2) is 20 to 70 mol %.
- the content ratio of the repeating structural unit of formula (1) is within the above range, the polyimide resin can be sufficiently crystallized even in a general injection molding cycle. If the content ratio is 20 mol % or more, the moldability is good, and if it is 70 mol % or less, the crystallinity is high and the heat resistance is excellent.
- the content ratio of the repeating structural unit of formula (1) to the total of the repeating structural unit of formula (1) and the repeating structural unit of formula (2) is preferably 65 mol% or less, from the viewpoint of expressing high crystallinity.
- the content ratio of the repeating structural unit of formula (1) to the total of the repeating structural unit of formula (1) and the repeating structural unit of formula (2) is preferably 20 mol % or more and less than 40 mol %. Within this range, the crystallinity of the polyimide resin (A1) is high, and a molded article having more excellent heat resistance can be obtained.
- the content ratio is preferably 25 mol% or more, more preferably 30 mol% or more, and still more preferably 32 mol% or more from the viewpoint of moldability, and is even more preferable from the viewpoint of expressing high crystallinity. is 35 mol % or less.
- the total content ratio of the repeating structural units of the formula (1) and the repeating structural units of the formula (2) with respect to all repeating structural units constituting the polyimide resin (A1) is preferably 50 to 100 mol%, more preferably 75 ⁇ 100 mol%, more preferably 80 to 100 mol%, still more preferably 85 to 100 mol%.
- Polyimide resin (A1) may further contain a repeating structural unit of the following formula (3).
- the content ratio of the repeating structural unit of formula (3) to the sum of the repeating structural units of formula (1) and the repeating structural units of formula (2) is preferably 25 mol % or less.
- the lower limit is not particularly limited as long as it exceeds 0 mol %.
- the content ratio is preferably 5 mol % or more, more preferably 10 mol % or more, from the viewpoint of improving heat resistance, and is preferably 20 mol % or less, more preferably 20 mol % or less, from the viewpoint of maintaining crystallinity. Preferably, it is 15 mol % or less.
- R 3 is a C 6-22 divalent group containing at least one aromatic ring.
- X 3 is a C 6-22 tetravalent group containing at least one aromatic ring.
- R 3 is a C 6-22 divalent group containing at least one aromatic ring.
- the aromatic ring may be a single ring or a condensed ring, and examples include, but are not limited to, benzene ring, naphthalene ring, anthracene ring, and tetracene ring. Among these, benzene ring and naphthalene ring are preferred, and benzene ring is more preferred.
- R 3 has 6 to 22 carbon atoms, preferably 6 to 18 carbon atoms.
- R 3 contains at least one, preferably 1 to 3, aromatic rings. A monovalent or divalent electron-withdrawing group may be bonded to the aromatic ring.
- Examples of monovalent electron-withdrawing groups include nitro group, cyano group, p-toluenesulfonyl group, halogen, halogenated alkyl group, phenyl group and acyl group.
- Examples of divalent electron-withdrawing groups include fluorinated alkylene groups (e.g., -C(CF 3 ) 2 -, -(CF 2 ) p - (where p is an integer of 1 to 10)). -CO-, -SO 2 -, -SO-, -CONH-, -COO-, etc., in addition to halogenated alkylene groups.
- R 3 is preferably a divalent group represented by the following formula (R3-1) or (R3-2).
- (m 31 and m 32 are each independently an integer of 0 to 2, preferably 0 or 1;
- m 33 and m 34 are each independently an integer of 0 to 2, preferably 0 or 1.
- R 21 , R 22 and R 23 are each independently an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, or an alkynyl group having 2 to 4 carbon atoms.
- p 21 , p 22 and p 23 are integers of 0 to 4, preferably 0.
- L 21 is a single bond, an ether group, a carbonyl group or an alkylene group having 1 to 4 carbon atoms.) Since R 3 is a divalent group having 6 to 22 carbon atoms and containing at least one aromatic ring, m 31 , m 32 , R 21 and p 21 in formula (R3-1) are represented by formula (R3- It is selected so that the number of carbon atoms of the divalent group represented by 1) falls within the range of 6-22. Similarly, L 21 , m 33 , m 34 , R 22 , R 23 , p 22 and p 23 in formula (R3-2) have It is chosen to fall within the range of 12-22.
- X3 is defined in the same manner as X1 in Formula ( 1 ), and the preferred embodiments are also the same.
- the polyimide resin (A1) may further contain a repeating structural unit represented by the following formula (4).
- R 4 is a divalent group containing —SO 2 — or —Si(R x )(R y )O—, and R x and R y each independently represent a chain aliphatic group having 1 to 3 carbon atoms or a phenyl group, and X 4 is a tetravalent group having 6 to 22 carbon atoms and containing at least one aromatic ring.
- X 4 is defined in the same manner as X 1 in formula (1), and the preferred embodiments are also the same.
- the terminal structure of the polyimide resin (A1) is not particularly limited, it preferably has a chain aliphatic group having 5 to 14 carbon atoms at its terminal.
- the chain aliphatic group may be saturated or unsaturated, linear or branched.
- saturated chain aliphatic groups having 5 to 14 carbon atoms include n-pentyl group, n-hexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, n-undecyl group, Lauryl group, n-tridecyl group, n-tetradecyl group, isopentyl group, neopentyl group, 2-methylpentyl group, 2-methylhexyl group, 2-ethylpentyl group, 3-ethylpentyl group, isooctyl group, 2-ethylhexyl group , 3-ethylhexyl group, isononyl group, 2-ethyloctyl group, isodecyl group, isododecyl group, isotridecyl group, isotetradecyl group and the like.
- Examples of unsaturated chain aliphatic groups having 5 to 14 carbon atoms include 1-pentenyl group, 2-pentenyl group, 1-hexenyl group, 2-hexenyl group, 1-heptenyl group, 2-heptenyl group and 1-octenyl group. , 2-octenyl group, nonenyl group, decenyl group, dodecenyl group, tridecenyl group, tetradecenyl group and the like.
- the chain aliphatic group is preferably a saturated chain aliphatic group, and more preferably a saturated straight chain aliphatic group.
- the chain aliphatic group preferably has 6 or more carbon atoms, more preferably 7 or more carbon atoms, still more preferably 8 or more carbon atoms, and preferably 12 or less carbon atoms, more preferably 12 or less carbon atoms. has 10 or less carbon atoms, more preferably 9 or less carbon atoms. Only one type of chain aliphatic group may be used, or two or more types may be used.
- the chain aliphatic group is particularly preferably at least one selected from the group consisting of n-octyl group, isooctyl group, 2-ethylhexyl group, n-nonyl group, isononyl group, n-decyl group and isodecyl group. More preferably at least one selected from the group consisting of n-octyl group, isooctyl group, 2-ethylhexyl group, n-nonyl group and isononyl group, most preferably n-octyl group, isooctyl group and It is at least one selected from the group consisting of 2-ethylhexyl groups.
- the polyimide resin (A1) preferably has only chain aliphatic groups having 5 to 14 carbon atoms at its terminals in addition to terminal amino groups and terminal carboxy groups.
- the content thereof is preferably 10 mol % or less, more preferably 5 mol % or less, relative to the chain aliphatic group having 5 to 14 carbon atoms.
- the content of the chain aliphatic group having 5 to 14 carbon atoms in the polyimide resin (A1) is 100 in total for all repeating structural units constituting the polyimide resin (A1). It is preferably 0.01 mol % or more, more preferably 0.1 mol % or more, and still more preferably 0.2 mol % or more based on mol %. Further, in order to secure a sufficient molecular weight and obtain good mechanical strength, the content of the chain aliphatic group having 5 to 14 carbon atoms in the polyimide resin (A1) constitutes the polyimide resin (A1).
- the content of the chain aliphatic group having 5 to 14 carbon atoms in the polyimide resin (A1) can be determined by depolymerizing the polyimide resin (A1).
- the polyimide resin (A1) preferably has a melting point of 360° C. or lower and a glass transition temperature of 150° C. or higher.
- the melting point of the polyimide resin (A1) is preferably 280° C. or higher, more preferably 290° C. or higher, from the viewpoint of heat resistance, and is preferably 345° C. or lower, more preferably 345° C. or lower, from the viewpoint of achieving high moldability. is 340° C. or less, more preferably 335° C. or less.
- the glass transition temperature of the polyimide resin (A1) is more preferably 160° C. or higher, more preferably 170° C. or higher from the viewpoint of heat resistance, and preferably 250° C. from the viewpoint of expressing high moldability.
- both the melting point and the glass transition temperature of the polyimide resin (A1) can be measured by a differential scanning calorimeter, and specifically can be measured by the method described in Examples.
- the polyimide resin (A1) is measured by a differential scanning calorimeter, and after melting the polyimide resin, it is cooled at a cooling rate of 20 ° C./min.
- the heat quantity at the crystallization exothermic peak (hereinafter also simply referred to as “crystallization exothermic value”) observed when the It is preferably 17.0 mJ/mg or more, and more preferably 17.0 mJ/mg or more.
- the upper limit of the crystallization heat value is not particularly limited, it is usually 45.0 mJ/mg or less.
- the crystallization heat value of the polyimide resin (A1) can be measured by the method described in Examples.
- Logarithmic viscosity at 30 ° C. of a 0.5% by mass concentrated sulfuric acid solution of the polyimide resin (A1) is preferably in the range of 0.2 to 2.0 dL / g, more preferably 0.3 to 1.8 dL / g . If the logarithmic viscosity is 0.2 dL / g or more, sufficient mechanical strength is obtained when the resulting polyimide resin composition is molded, and if it is 2.0 dL / g or less, moldability and handling becomes better.
- the weight average molecular weight Mw of the polyimide resin (A1) is preferably 10,000 to 150,000, more preferably 15,000 to 100,000, still more preferably 20,000 to 80,000, still more preferably 30, 000 to 70,000, more preferably 35,000 to 65,000.
- the weight average molecular weight Mw of the polyimide resin (A1) can be measured by gel permeation chromatography (GPC) using polymethyl methacrylate (PMMA) as a standard sample.
- thermoplastic polyimide resin (A) can be produced by reacting a tetracarboxylic acid component and a diamine component.
- a method for producing the polyimide resin (A1) will be described below as an example.
- the tetracarboxylic acid component contains an aromatic tetracarboxylic acid and/or a derivative thereof
- the diamine component comprises an aliphatic diamine containing at least one alicyclic hydrocarbon structure and a chain containing aliphatic diamines.
- Aromatic tetracarboxylic acids are compounds in which four carboxy groups are directly bonded to an aromatic ring, and may contain alkyl groups in the structure. Further, the aromatic tetracarboxylic acid preferably has 6 to 26 carbon atoms. Examples of aromatic tetracarboxylic acids include pyromellitic acid, 2,3,5,6-toluenetetracarboxylic acid, 3,3′,4,4′-benzophenonetetracarboxylic acid, 3,3′,4,4′- Biphenyltetracarboxylic acid, 1,4,5,8-naphthalenetetracarboxylic acid and the like are preferred. Among these, pyromellitic acid is more preferable.
- Derivatives of aromatic tetracarboxylic acids include anhydrides and alkyl esters of aromatic tetracarboxylic acids.
- the tetracarboxylic acid derivative preferably has 6 to 38 carbon atoms.
- Anhydrides of aromatic tetracarboxylic acids include pyromellitic monoanhydride, pyromellitic dianhydride, 2,3,5,6-toluenetetracarboxylic dianhydride, 3,3',4,4' -diphenylsulfonetetracarboxylic dianhydride, 3,3',4,4'-benzophenonetetracarboxylic dianhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride, 1,4, 5,8-naphthalenetetracarboxylic dianhydride and the like.
- Alkyl esters of aromatic tetracarboxylic acids include dimethyl pyromellitic acid, diethyl pyromellitic acid, dipropyl pyromellitic acid, diisopropyl pyromellitic acid, dimethyl 2,3,5,6-toluenetetracarboxylate, and 3,3′. , dimethyl 4,4′-diphenylsulfonetetracarboxylate, dimethyl 3,3′,4,4′-benzophenonetetracarboxylate, dimethyl 3,3′,4,4′-biphenyltetracarboxylate, 1,4,5 , 8-naphthalenetetracarboxylic acid dimethyl.
- the alkyl group preferably has 1 to 3 carbon atoms.
- aromatic tetracarboxylic acid and/or its derivative at least one compound selected from the above may be used alone, or two or more compounds may be used in combination.
- the aliphatic diamine containing at least one alicyclic hydrocarbon structure preferably has 6 to 22 carbon atoms, such as 1,2-bis(aminomethyl)cyclohexane, 1,3-bis(aminomethyl)cyclohexane, 1, 4-bis(aminomethyl)cyclohexane, 1,2-cyclohexanediamine, 1,3-cyclohexanediamine, 1,4-cyclohexanediamine, 4,4'-diaminodicyclohexylmethane, 4,4'-methylenebis(2-methylcyclohexyl amine), carvonediamine, limonenediamine, isophoronediamine, norbornanediamine, bis(aminomethyl)tricyclo[5.2.1.0 2,6 ]decane, 3,3′-dimethyl-4,4′-diaminodicyclohexyl Methane, 4,4'-diaminodicyclohexylpropane and the like are preferred.
- Aliphatic diamines containing an alicyclic hydrocarbon structure generally have structural isomers, but the ratio of cis/trans isomers is not limited.
- the chain aliphatic diamine may be linear or branched, and preferably has 5 to 16 carbon atoms, more preferably 6 to 14 carbon atoms, and still more preferably 7 to 12 carbon atoms. In addition, if the chain portion has 5 to 16 carbon atoms, an ether bond may be included therebetween.
- Chain aliphatic diamines such as 1,5-pentamethylenediamine, 2-methylpentane-1,5-diamine, 3-methylpentane-1,5-diamine, 1,6-hexamethylenediamine, 1,7-hepta methylenediamine, 1,8-octamethylenediamine, 1,9-nonamethylenediamine, 1,10-decamethylenediamine, 1,11-undecamethylenediamine, 1,12-dodecamethylenediamine, 1,13-trideca Methylenediamine, 1,14-tetradecamethylenediamine, 1,16-hexadecamethylenediamine, 2,2'-(ethylenedioxy)bis(ethyleneamine) and the like are preferred.
- Chain aliphatic diamines may be used singly or in combination. Among these, chain aliphatic diamines having 8 to 10 carbon atoms can be preferably used, and at least one selected from the group consisting of 1,8-octamethylenediamine and 1,10-decamethylenediamine is particularly preferable. Available.
- the total amount of the aliphatic diamine and the chain aliphatic diamine containing at least one alicyclic hydrocarbon structure the aliphatic diamine containing at least one alicyclic hydrocarbon structure
- the molar ratio of charged amount is preferably 20 to 70 mol %.
- the molar amount is preferably 25 mol% or more, more preferably 30 mol% or more, still more preferably 32 mol% or more, and from the viewpoint of expressing high crystallinity, preferably 60 mol% or less, more preferably 50 mol% or more.
- mol % or less more preferably less than 40 mol %, more preferably 35 mol % or less.
- the diamine component may contain a diamine containing at least one aromatic ring.
- the diamine containing at least one aromatic ring preferably has 6 to 22 carbon atoms, such as orthoxylylenediamine, metaxylylenediamine, paraxylylenediamine, 1,2-diethynylbenzenediamine, 1,3-diethynyl.
- the lower limit of the molar ratio is not particularly limited as long as it exceeds 0 mol %. From the viewpoint of improving heat resistance, it is preferably 5 mol % or more, more preferably 10 mol % or more. Further, the molar ratio is preferably 25 mol % or less, preferably 20 mol % or less, more preferably 15 mol % or less from the viewpoint of maintaining crystallinity.
- the molar ratio is preferably 12 mol% or less, more preferably 10 mol% or less, even more preferably 5 mol% or less, and even more preferably 0 mol%. .
- the charging ratio of the tetracarboxylic acid component and the diamine component is preferably 0.9 to 1.1 mol of the diamine component with respect to 1 mol of the tetracarboxylic acid component.
- the polyimide resin (A1) it is preferable to mix a terminal blocking agent in addition to the tetracarboxylic acid component and the diamine component.
- a terminal blocking agent at least one selected from the group consisting of monoamines and dicarboxylic acids is preferable.
- the amount of the terminal blocker to be used may be an amount that can introduce a desired amount of terminal groups into the polyimide resin (A1), and is 0.0001 to 0.001 to 0.001 to 1 mol of the tetracarboxylic acid and/or derivative thereof. 1 mol is preferred, 0.001 to 0.06 mol is more preferred, and 0.002 to 0.035 mol is even more preferred.
- a monoamine terminal blocking agent is preferable as the terminal blocking agent, and from the viewpoint of improving heat aging resistance by introducing the chain aliphatic group having 5 to 14 carbon atoms described above at the end of the polyimide resin (A1). , monoamines having a chain aliphatic group of 5 to 14 carbon atoms are more preferred, and monoamines having a saturated linear aliphatic group of 5 to 14 carbon atoms are even more preferred.
- the terminal blocking agent is particularly preferably at least one selected from the group consisting of n-octylamine, isooctylamine, 2-ethylhexylamine, n-nonylamine, isononylamine, n-decylamine, and isodecylamine. , more preferably at least one selected from the group consisting of n-octylamine, isooctylamine, 2-ethylhexylamine, n-nonylamine, and isononylamine, most preferably n-octylamine, isooctylamine, and 2-ethylhexylamine.
- thermoplastic polyimide resin (A) A known polymerization method can be applied as the polymerization method for producing the thermoplastic polyimide resin (A).
- a method for producing the polyimide resin (A1) the method described in International Publication No. 2016/147996 can be used.
- the thermoplastic polyimide resin composition of the present invention contains carbon fiber as component (B) from the viewpoint of improving rigidity.
- component (B) used in the composition of the present invention include polyacrylonitrile-based carbon fibers and pitch-based carbon fibers.
- the form of the carbon fiber is not particularly limited, and depending on the form of the resulting thermoplastic polyimide resin composition and molded article, either continuous fiber or staple fiber can be used, or both can be used in combination.
- the component (B) is short fibers having an average fiber length of less than 10 mm from the viewpoint of extrusion moldability. preferable.
- the average fiber length of the component (B), which is short fibers, is more preferably 0.5 to 8 mm, more preferably 2 to 8 mm.
- the average fiber diameter of component (B) is preferably 1 to 100 ⁇ m, more preferably 3 to 50 ⁇ m, still more preferably 4 to 20 ⁇ m. When the average fiber diameter of the component (B) is within this range, processing is easy, and the resulting molded article has excellent rigidity.
- the average fiber length (in the case of short fibers) and average fiber diameter of component (B) are observed and measured by randomly selecting 50 or more fibers with a scanning electron microscope (SEM) or the like, and the number average is calculated. It is obtained by calculating
- the number of filaments of component (B) is usually in the range of 500-100,000, preferably 5,000-80,000, more preferably 10,000-70,000.
- the component (B) is preferably surface-treated with a surface treatment agent.
- the surface treatment agent is a concept including a sizing agent and a sizing agent.
- Examples of surface treatment agents include epoxy-based materials, urethane-based materials, acrylic materials, polyamide-based materials, polyester-based materials, vinyl ester-based materials, polyolefin-based materials, and polyether-based materials.
- a species or a combination of two or more species can be used. At least one selected from the group consisting of epoxy-based materials and urethane-based materials is preferable as the surface treatment agent from the viewpoint of obtaining higher rigidity.
- the amount of treatment with the component (B) surface treatment agent can be appropriately selected depending on the type of surface treatment agent, the form of the carbon fiber, and the like.
- the amount of the sizing agent attached is preferably is in the range of 1.5 to 10% by weight, more preferably 2 to 5% by weight.
- a commercially available product can also be used as the component (B).
- Examples of commercially available carbon fibers include chopped fibers “CFUW”, “CFEPP”, “CFEPU”, “CFA4", "FX1", “EX1”, and “BF-WS” manufactured by Nippon Polymer Sangyo Co., Ltd. , "CF-N” series, Mitsubishi Chemical's “Pyrofil Chopped Fiber” series, and Teijin Limited's "Tenax Chopped Fiber” series.
- thermoplastic polyimide resin composition of the present invention contains a fluororesin as component (C) from the viewpoint of improving slidability.
- the component (C) used in the composition of the present invention includes, for example, polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), a co-polymer of tetrafluoroethylene and hexafluoropropylene.
- FEP Polymer
- PFA copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether
- ETFE copolymer of tetrafluoroethylene and ethylene
- polytetrafluoroethylene is preferable from the viewpoint of improving slidability and heat resistance.
- Component (C) used in the present invention is preferably in the form of powder from the viewpoint of dispersibility in component (A) and handleability.
- its average particle size (D50) is not particularly limited, but from the viewpoint of dispersibility in component (A) and handleability, it is preferably 1 to 50 ⁇ m, more preferably 2 to 50 ⁇ m. 40 ⁇ m, more preferably 3-30 ⁇ m, even more preferably 5-20 ⁇ m.
- the average particle diameter (D50) can be measured with a laser diffraction light scattering particle size distribution analyzer.
- polytetrafluoroethylene includes, for example, Kitamura Co., Ltd. "KT-300M”, “KT-400M”, “KT-600M”, “KTL-450A”, “KTL-450”, “KTL-610", “KTL-610A”, “KTL-620", “KTL-20N”, “KTL-10N”, “KTL-10S”, “KTL-9N”, “KTL-9S”, “KTL” -8N", “KTL-4N", "KTL-2N”, “KTL-1N”, “KTL-8F”, “KTL-8FH”, “KTL-500F", 3M Dynion PTFE manufactured by 3M Japan Ltd.
- Examples include micropowder "TF9201Z”, “TF9205", “TF9207”, “Polyflon PTFE-M” series, “Polyflon PTFE-F” series and “Polyflon PTFE Rubron” series manufactured by Daikin Industries, Ltd.
- the thermoplastic polyimide resin composition of the present invention contains an inorganic filler as component (D) from the viewpoint of reducing the specific wear loss of the resulting molded article.
- component (D) in the present invention does not include fillers consisting only of carbon atoms, such as graphite and graphite.
- the shape of component (D) used in the composition of the present invention is not particularly limited, and examples thereof include spherical, plate-like and fibrous shapes.
- Component (D) includes, for example, silica, alumina, kaolinite, wollastonite (calcium silicate), mica, talc, clay, sericite, magnesium carbonate, calcium carbonate, magnesium sulfate, calcium oxide, titanium oxide, carbonization Silicon, antimony trisulfide, tin sulfide, copper sulfide, iron sulfide, bismuth sulfide, zinc sulfide, metal powder, glass powder, glass flakes, glass beads, glass balloon, metal fiber, silica fiber, silica-alumina fiber, alumina fiber, Zirconia fiber, boron nitride fiber, silicon nitride fiber, boron fiber, potassium titanate whisker, aluminum borate whisker, magnesium-based whisker, silicon-based whisker, etc., and one or more of these can be used. .
- the component (D) is preferably an inorganic filler containing calcium element, more preferably a group consisting of calcium carbonate and wollastonite, from the viewpoint of further reducing the specific wear amount of the resulting molded article.
- Inorganic fillers containing calcium elements have a moderately high Mohs hardness, which increases the hardness of the molded product obtained, and increases the amount of wear due to the abrasion powder generated by abrasion of the molded product acting as an abrasive. can be suppressed, it is thought that the specific wear amount can be further reduced.
- the size of component (D) also varies depending on the shape of the inorganic filler.
- the average particle diameter is preferably from 0.01 to 0.01 from the viewpoint of improving mechanical strength, reducing specific wear loss, and improving dispersibility in component (A). 50 ⁇ m, more preferably 0.1 to 30 ⁇ m, still more preferably 0.2 to 20 ⁇ m, still more preferably 0.2 to 15 ⁇ m, still more preferably 0.2 to 10 ⁇ m, still more preferably 0.5 to 5 ⁇ m be.
- the average particle size can be measured by the same method as for component (C).
- the average fiber length is preferably 5 to 300 ⁇ m, from the viewpoint of improving mechanical strength, reducing specific wear loss, and improving dispersibility in component (A) It is preferably 10 to 180 ⁇ m, and the average fiber diameter is preferably 0.1 to 100 ⁇ m, more preferably 0.2 to 50 ⁇ m, still more preferably 0.2 to 20 ⁇ m.
- the average fiber length and average fiber diameter of the fibrous inorganic filler can be measured in the same manner as for component (B).
- thermoplastic polyimide resin composition of the present invention is high in rigidity, and from the viewpoint of obtaining a highly slidable molded article with a low coefficient of dynamic friction and a small amount of specific wear. , preferably in the following range.
- the content of component (A) in the thermoplastic polyimide resin composition is 30-60% by mass, preferably 35-60% by mass, more preferably 40-55% by mass. If the content of component (A) in the thermoplastic polyimide resin composition is 30% by mass or more, molding processability is good, and if it is 60% by mass or less, rigidity and slidability are good.
- the content of component (B) in the thermoplastic polyimide resin composition is 5 to 50% by mass, preferably 5 to 40% by mass, more preferably 10 to 35% by mass, still more preferably 10 to 30% by mass. is. If the content of the component (B) in the thermoplastic polyimide resin composition is 5% by mass or more, the effect of improving rigidity is obtained, and if it is 50% by mass or less, molding processability is reduced, specific wear amount and dynamic friction coefficient are reduced. You can control the increase.
- the content of component (C) in the thermoplastic polyimide resin composition is 5-20% by mass, preferably 5-15% by mass. If the content of the component (C) in the thermoplastic polyimide resin composition is 5% by mass or more, the effect of improving slidability can be obtained, and if it is 20% by mass or less, the rigidity can be maintained.
- the content of component (D) in the thermoplastic polyimide resin composition is 1 to 40% by mass, preferably 5 to 40% by mass, more preferably 5 to 30% by mass, still more preferably 10 to 30% by mass. is. If the content of component (D) in the thermoplastic polyimide resin composition is 1% by mass or more, the specific wear amount can be reduced, and if it is 40% by mass or less, moldability can be maintained.
- the total content of components (A) to (D) in the thermoplastic polyimide resin composition is preferably 50% by mass or more, more preferably 65% by mass or more, and still more preferably 70% by mass, from the viewpoint of obtaining the effects of the present invention. % by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, still more preferably 95% by mass or more, and 100% by mass or less.
- the thermoplastic polyimide resin composition of the present invention may further contain graphite as component (E) from the viewpoint of imparting various properties such as blackness and flame retardancy.
- Graphite used as component (E) may be either natural graphite or artificial graphite, for example, flake graphite, flaky graphite (vein graphite, also referred to as massive graphite), earthy graphite, spherical graphite, etc. natural graphite, expanded graphite obtained by chemically treating flake graphite with concentrated sulfuric acid or the like and then heating it, expanded graphite obtained by heat-treating expanded graphite at a high temperature, and artificial graphite.
- natural graphite is preferable as the graphite used for the component (E), and at least one selected from the group consisting of flake graphite and flake graphite is more preferable.
- Component (E) may be surface-treated with a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, or the like, as long as the effects of the present invention are not impaired.
- the average particle size of component (E) is not particularly limited, but from the viewpoint of improving various properties such as blackness and flame retardancy, and from the viewpoint of dispersibility in component (A) and handleability, it is preferably 1 to 50 ⁇ m, More preferably 2 to 40 ⁇ m, still more preferably 3 to 30 ⁇ m, still more preferably 5 to 20 ⁇ m.
- the average particle size can be measured by the same method as for component (C).
- a commercially available product can also be used as the component (E) graphite.
- Examples of commercially available graphite include flake graphite "BF-3AK”, “BF-15AK”, “FBF”, “CBR”, “CPB-6S”, and “CPB-3” manufactured by Chuetsu Graphite Co., Ltd. , "96L”, “96L-3”, “K-3”, scale graphite “BF-10AK”, “HLP”, spherical graphite "WF-15C”, scale graphite powder CP series manufactured by Nippon Graphite Industry Co., Ltd.
- the content of component (E) in the thermoplastic polyimide resin composition is preferably 0.1 to 15 mass%, more preferably 1 to 15 mass. %, more preferably 5 to 15 mass %, even more preferably 5 to 10 mass %. If the content of the component (E) in the thermoplastic polyimide resin composition is 0.1% by mass or more, the effect of imparting various properties such as blackness and flame retardancy is easily obtained, and if it is 15% by mass or less, molding A decrease in workability can be suppressed. When emphasizing the mechanical strength and slidability improvement of the resulting molded article, the content of component (E) in the thermoplastic polyimide resin composition is preferably less than 10% by mass, more preferably It is 5% by mass or less.
- the thermoplastic polyimide resin composition of the present invention contains a matting agent, a nucleating agent, a plasticizer, an antistatic agent, an anti-coloring agent, an anti-gelling agent, a coloring agent, an antioxidant, a conductive agent, a resin modifier, Additives such as flame retardants can be incorporated as required.
- the amount of the above additive is not particularly limited, but from the viewpoint of expressing the effect of the additive without impairing the effect of the present invention, it is usually 50% by mass or less, preferably 35% by mass, in the thermoplastic polyimide resin composition. % by mass or less, more preferably 0.0001 to 30% by mass, still more preferably 0.001 to 15% by mass, even more preferably 0.01 to 10% by mass, still more preferably 0.01 to 5% by mass %.
- thermoplastic polyimide resin composition of the present invention may contain resins other than the component (A) as long as the properties thereof are not impaired.
- resins include polyamide resins, polyester resins, polycarbonate resins, polyetherimide resins, polyamideimide resins, polyphenylene etherimide resins, polyphenylene sulfide resins, polysulfone resins, polyethersulfone resins, polyarylate resins, liquid crystal polymers, and polyetherimide resins.
- thermoplastic polyimide resin composition of the present invention can take any form, but from the viewpoint of extrusion molding to produce a molded product, it is preferably powder or pellets, more preferably pellets. .
- a pellet made of a thermoplastic polyimide resin composition can be produced, for example, as follows. First, component (C), component (D), component (E) used as necessary, and various other optional components are added and dry-blended. Next, the dry blend and component (B) are side-fed to component (A) melted in advance in an extruder, melt-kneaded, extruded into strands, and cut into strands.
- a molded article having a desired shape can be easily produced by introducing the pellets into various molding machines and thermoforming them by the method described below.
- the present invention provides a molded article containing the thermoplastic polyimide resin composition. Since the thermoplastic polyimide resin composition of the present invention has thermoplasticity derived from the component (A), the molded article of the present invention can be easily produced by thermoforming. For example, after drying the pellets of the thermoplastic polyimide resin composition obtained by the above method, the pellets can be introduced into various molding machines and thermoformed to produce a molded article having a desired shape. Examples of thermoforming methods include injection molding, extrusion molding, sheet extrusion molding, blow molding, hot press molding, vacuum molding, pressure molding, laser molding, insert molding, welding, and welding. Molding is possible by any method. Among them, injection molding is preferable because molding can be performed without setting the molding temperature to a high temperature exceeding, for example, 400°C.
- thermoplastic polyimide resin composition of the present invention is excellent in moldability, and can be used to produce molded articles with high rigidity, low dynamic friction coefficient, low specific wear, and high slidability.
- the molded product can be applied to applications that require excellent rigidity and sliding properties, such as bearings for automobiles, bearings for copiers, etc., gears, bearings, bushes, mechanical seals, transmission seals, etc. .
- thermoplastic polyimide resin was prepared using "JIR-WINSPEC50" manufactured by JEOL Ltd.
- thermoplastic polyimide resin The melting point Tm, glass transition temperature Tg, crystallization temperature Tc, and crystallization heat value ⁇ Hm of the thermoplastic polyimide resin were measured using a differential scanning calorimeter ("DSC-6220" manufactured by SII Nanotechnology Co., Ltd.). It was measured.
- a thermoplastic polyimide resin was subjected to a thermal history under the following conditions in a nitrogen atmosphere. The thermal history conditions were a first temperature increase (temperature increase rate of 10° C./min), then cooling (temperature decrease rate of 20° C./min), and then a second temperature increase (temperature increase rate of 10° C./min).
- the melting point Tm was determined by reading the peak top value of the endothermic peak observed the second time the temperature was raised.
- the glass transition temperature Tg was determined by reading the value observed at the second heating.
- the crystallization temperature Tc was determined by reading the peak top value of the exothermic peak observed during cooling.
- the crystallization heat value ⁇ Hm (mJ/mg) was calculated from the area of the exothermic peak observed during cooling.
- thermoplastic polyimide resin was measured using a differential scanning calorimeter ("DSC-6220" manufactured by SII Nanotechnology Co., Ltd.). After holding at 420 ° C. for 10 minutes in a nitrogen atmosphere to completely melt the thermoplastic polyimide resin, when performing a rapid cooling operation at a cooling rate of 70 ° C./min, the peak from the appearance of the crystallization peak observed Calculate the time it took to reach the top. In addition, in Table 1, when the semi-crystallization time was 20 seconds or less, it was described as " ⁇ 20".
- the cutting test piece After cutting the ISO multi-purpose test piece to a thickness of 80 mm ⁇ 10 mm ⁇ 4 mm, the cutting test piece was used to measure bending strength (unit: MPa) and bending elastic modulus (unit: GPa) at a temperature of 23 ° C. in accordance with ISO 178. It was measured.
- thermoplastic polyimide resin 1 2-(2-methoxyethoxy) ethanol (Nippon Emulsifier Co., Ltd. )) and 218.12 g (1.00 mol) of pyromellitic dianhydride (manufactured by Mitsubishi Gas Chemical Co., Ltd.) were introduced, and after nitrogen flow, the mixture was stirred at 150 rpm to form a uniform suspension. .
- 1,8- A mixed diamine solution was prepared by dissolving 93.77 g (0.65 mol) of octamethylenediamine (manufactured by Kanto Chemical Co., Ltd.) in 250 g of 2-(2-methoxyethoxy)ethanol. This mixed diamine solution was slowly added into the flask using a plunger pump. Heat was generated by the dropwise addition, but the internal temperature was adjusted to be within the range of 40 to 80°C.
- thermoplastic polyimide resin 1 powder was washed with 300 g of 2-(2-methoxyethoxy)ethanol and 300 g of methanol, filtered, and dried in a dryer at 180° C. for 10 hours to obtain 317 g of thermoplastic polyimide resin 1 powder. got When the IR spectrum of thermoplastic polyimide resin 1 was measured, characteristic absorption of the imide ring was observed at ⁇ (C ⁇ O) 1768, 1697 (cm ⁇ 1 ).
- Table 1 shows the composition and physical property measurement results of thermoplastic polyimide resin 1 in Production Example 1.
- the mol % of the tetracarboxylic acid component and the diamine component in Table 1 are values calculated from the amount of each component charged during the production of the polyimide resin.
- thermoplastic polyimide resin composition Each component was weighed so as to obtain the composition shown in Table 2, which will be described later.
- the fluororesin, inorganic filler, and graphite were blended in a tumbler.
- the temperature setting of the extruder was 340° C., and the screw rotation speed was 150 rpm.
- Comparative Example 3 is a thermoplastic polyimide resin A pellet consisting of 1) was produced. Using the obtained pellets, test pieces were prepared as described above, and various evaluations were performed. Table 2 shows the results.
- the molded articles made of the thermoplastic polyimide resin of this example had a specific wear amount of 12.0 (10 ⁇ 4 mm 3 /N ⁇ km) or less, which was obtained in Comparative Examples 1 to 4. Compared with the molded product, the specific wear amount was small and the dynamic friction coefficient was able to achieve 0.600 or less. In addition, the molded article of this example also had good mechanical properties, and in particular showed a higher value than those of Comparative Examples 1, 3 and 4 in flexural modulus. From the comparison between Example 4 and Comparative Example 2, it can be seen that the slidability is inferior when graphite is used instead of the component (D).
- thermoplastic polyimide resin composition of the present invention it is possible to produce a highly slidable molded product with high rigidity, a low coefficient of dynamic friction, and a small amount of specific wear.
- the resin composition and molded article are suitable for applications requiring excellent rigidity and sliding properties, such as bearings for automobiles, bearings for copiers, etc., gears, bearings, bushes, mechanical seals, and transmission seals. etc. is suitably used.
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Abstract
Description
例えば特許文献2には、少なくとも1つの芳香環を含むテトラカルボン酸及び/またはその誘導体、少なくとも1つの脂環式炭化水素構造を含むジアミン、及び鎖状脂肪族ジアミンを反応させて得られる、所定の繰り返し構成単位を含む熱可塑性ポリイミド樹脂が開示されている。
例えば特許文献3には、半芳香族ポリイミド樹脂を含有し、さらに黒鉛又は黒鉛、フッ素樹脂、及び炭素繊維からなる群から選ばれる2種以上の組み合わせのいずれかを所定量含有する難燃性ポリイミド成形材料が開示されている。また特許文献4には、所定の繰り返し単位を含む熱可塑性ポリイミド樹脂と、所定の要件を満たすフッ素樹脂とを含有するポリイミド樹脂組成物が、成形加工が容易で、高摺動性で且つ外観良好な成形体を作製しうることが開示されている。
本発明の課題は、剛性が高く、且つ、動摩擦係数が低く比摩耗量の少ない高摺動性の成形品を作製しうる熱可塑性ポリイミド樹脂組成物、及び該熱可塑性ポリイミド樹脂組成物を含む成形品を提供することにある。
すなわち本発明は、下記に関する。
[1]熱可塑性ポリイミド樹脂(A)30~60質量%、炭素繊維(B)5~50質量%、フッ素樹脂(C)5~20質量%、及び、無機充填材(D)1~40質量%を含有する熱可塑性ポリイミド樹脂組成物。
[2]上記[1]に記載の熱可塑性ポリイミド樹脂組成物を含む成形品。
本発明の熱可塑性ポリイミド樹脂組成物(以下、単に「本発明の組成物」ともいう)は、熱可塑性ポリイミド樹脂(A)30~60質量%、炭素繊維(B)5~50質量%、フッ素樹脂(C)5~20質量%、及び、無機充填材(D)1~40質量%を含有する。
本発明の熱可塑性ポリイミド樹脂組成物によれば、剛性が高く、且つ、動摩擦係数が低く比摩耗量の少ない高摺動性の成形品を作製することができる。なお本発明において「剛性」については曲げ弾性率、「機械的強度」又は「強度」については曲げ強度を指標とするものとする。また摺動性については動摩擦係数及び比摩耗量を指標とし、動摩擦係数、及び比摩耗量が低い値であるほど高摺動性であることを意味する。
本発明の組成物は熱可塑性ポリイミド樹脂(A)を含有することで、熱可塑性を有し、且つ熱可塑性樹脂組成物としては比較的高い耐熱性及び摺動性を有するものとなる。また炭素繊維(B)は剛性、フッ素樹脂(C)は摺動性の向上に寄与し、本発明の組成物にこれらを所定量含有させることで高い剛性及び摺動性を付与できる。
しかしながら炭素繊維(B)を含有する樹脂組成物からなる成形品は、剛性は向上するものの、フッ素樹脂(C)を含有していても比摩耗量が増大する傾向があった。本発明の組成物はさらに所定量の無機充填材(D)を含有することで、得られる成形品の硬度が向上し、それにより比摩耗量の増大を抑制できたと考えられる。
本発明に用いる熱可塑性ポリイミド樹脂(A)(以下、単に「成分(A)」ともいう)は熱可塑性であり、その形態としては粉末又はペレットであることが好ましい。熱可塑性ポリイミド樹脂は、例えばポリアミド酸等のポリイミド前駆体の状態で成形した後にイミド環を閉環して形成される、ガラス転移温度(Tg)を持たないポリイミド樹脂、あるいはガラス転移温度よりも低い温度で分解してしまうポリイミド樹脂とは区別される。
全芳香族熱可塑性ポリイミド樹脂の市販品としては、例えば三井化学(株)製「AURUM」が挙げられる。
より好ましくは、成分(A)は、下記式(1)で示される繰り返し構成単位及び下記式(2)で示される繰り返し構成単位を含み、該式(1)の繰り返し構成単位と該式(2)の繰り返し構成単位の合計に対する該式(1)の繰り返し構成単位の含有比が20~70モル%のポリイミド樹脂(A1)である。
(R1は少なくとも1つの脂環式炭化水素構造を含む炭素数6~22の2価の脂肪族基である。R2は炭素数5~16の2価の鎖状脂肪族基である。X1及びX2は、それぞれ独立に、炭素数6~22の4価の芳香族基である。)
以下、当該ポリイミド樹脂を単に「ポリイミド樹脂(A1)」ともいい、ポリイミド樹脂(A1)を例として詳細を説明する。
R1は少なくとも1つの脂環式炭化水素構造を含む炭素数6~22の2価の脂肪族基である。ここで、脂環式炭化水素構造とは、脂環式炭化水素化合物から誘導される環を意味し、該脂環式炭化水素化合物は、飽和であっても不飽和であってもよく、単環であっても多環であってもよい。
脂環式炭化水素構造としては、シクロヘキサン環等のシクロアルカン環、シクロヘキセン等のシクロアルケン環、ノルボルナン環等のビシクロアルカン環、及びノルボルネン等のビシクロアルケン環が例示されるが、これらに限定されるわけではない。これらの中でも、好ましくはシクロアルカン環、より好ましくは炭素数4~7のシクロアルカン環、さらに好ましくはシクロヘキサン環である。
R1の炭素数は6~22であり、好ましくは8~17である。
R1は脂環式炭化水素構造を少なくとも1つ含み、好ましくは1~3個含む。
(m11及びm12は、それぞれ独立に、0~2の整数であり、好ましくは0又は1、より好ましくは1である。m13~m15は、それぞれ独立に、0~2の整数であり、好ましくは0又は1である。)
なお、上記の式(R1-3)で表される2価の基において、2つのメチレン基のシクロヘキサン環に対する位置関係はシスであってもトランスであってもよく、またシスとトランスの比は如何なる値でもよい。
X1の炭素数は6~22であり、好ましくは6~18である。
X1は芳香環を少なくとも1つ含み、好ましくは1~3個含む。
(R11~R18は、それぞれ独立に、炭素数1~4のアルキル基である。p11~p13は、それぞれ独立に、0~2の整数であり、好ましくは0である。p14、p15、p16及びp18は、それぞれ独立に、0~3の整数であり、好ましくは0である。p17は0~4の整数であり、好ましくは0である。L11~L13は、それぞれ独立に、単結合、エーテル基、カルボニル基又は炭素数1~4のアルキレン基である。)
なお、X1は炭素数6~22の4価の芳香族基であるので、式(X-2)におけるR12、R13、p12及びp13は、式(X-2)で表される4価の芳香族基の炭素数が10~22の範囲に入るように選択される。
同様に、式(X-3)におけるL11、R14、R15、p14及びp15は、式(X-3)で表される4価の芳香族基の炭素数が12~22の範囲に入るように選択され、式(X-4)におけるL12、L13、R16、R17、R18、p16、p17及びp18は、式(X-4)で表される4価の芳香族基の炭素数が18~22の範囲に入るように選択される。
R2は炭素数5~16の2価の鎖状脂肪族基であり、好ましくは炭素数6~14、より好ましくは炭素数7~12、更に好ましくは炭素数8~10である。ここで、鎖状脂肪族基とは、鎖状脂肪族化合物から誘導される基を意味し、該鎖状脂肪族化合物は、飽和であっても不飽和であってもよく、直鎖状であっても分岐状であってもよく、酸素原子等のヘテロ原子を含んでいてもよい。
R2は、好ましくは炭素数5~16のアルキレン基であり、より好ましくは炭素数6~14、更に好ましくは炭素数7~12のアルキレン基であり、なかでも好ましくは炭素数8~10のアルキレン基である。前記アルキレン基は、直鎖アルキレン基であっても分岐アルキレン基であってもよいが、好ましくは直鎖アルキレン基である。
R2は、好ましくはオクタメチレン基及びデカメチレン基からなる群から選ばれる少なくとも1種であり、特に好ましくはオクタメチレン基である。
(m21及びm22は、それぞれ独立に、1~15の整数であり、好ましくは1~13、より好ましくは1~11、更に好ましくは1~9である。m23~m25は、それぞれ独立に、1~14の整数であり、好ましくは1~12、より好ましくは1~10、更に好ましくは1~8である。)
なお、R2は炭素数5~16(好ましくは炭素数6~14、より好ましくは炭素数7~12、更に好ましくは炭素数8~10)の2価の鎖状脂肪族基であるので、式(R2-1)におけるm21及びm22は、式(R2-1)で表される2価の基の炭素数が5~16(好ましくは炭素数6~14、より好ましくは炭素数7~12、更に好ましくは炭素数8~10)の範囲に入るように選択される。すなわち、m21+m22は5~16(好ましくは6~14、より好ましくは7~12、更に好ましくは8~10)である。
同様に、式(R2-2)におけるm23~m25は、式(R2-2)で表される2価の基の炭素数が5~16(好ましくは炭素数6~14、より好ましくは炭素数7~12、更に好ましくは炭素数8~10)の範囲に入るように選択される。すなわち、m23+m24+m25は5~16(好ましくは炭素数6~14、より好ましくは炭素数7~12、更に好ましくは炭素数8~10)である。
式(1)の繰り返し構成単位と式(2)の繰り返し構成単位の合計に対する、式(1)の繰り返し構成単位の含有比は、高い結晶性を発現する観点から、好ましくは65モル%以下、より好ましくは60モル%以下、更に好ましくは50モル%以下である。
中でも、式(1)の繰り返し構成単位と式(2)の繰り返し構成単位の合計に対する式(1)の繰り返し構成単位の含有比は20モル%以上、40モル%未満であることが好ましい。この範囲であるとポリイミド樹脂(A1)の結晶性が高くなり、より耐熱性に優れる成形品を得ることができる。
上記含有比は、成形加工性の観点からは、好ましくは25モル%以上、より好ましくは30モル%以上、更に好ましくは32モル%以上であり、高い結晶性を発現する観点から、より更に好ましくは35モル%以下である。
前記含有比は、耐熱性の向上という観点からは、好ましくは5モル%以上、より好ましくは10モル%以上であり、一方で結晶性を維持する観点からは、好ましくは20モル%以下、より好ましくは15モル%以下である。
(R3は少なくとも1つの芳香環を含む炭素数6~22の2価の基である。X3は少なくとも1つの芳香環を含む炭素数6~22の4価の基である。)
R3の炭素数は6~22であり、好ましくは6~18である。
R3は芳香環を少なくとも1つ含み、好ましくは1~3個含む。
また、前記芳香環には1価もしくは2価の電子求引性基が結合していてもよい。1価の電子求引性基としてはニトロ基、シアノ基、p-トルエンスルホニル基、ハロゲン、ハロゲン化アルキル基、フェニル基、アシル基などが挙げられる。2価の電子求引性基としては、フッ化アルキレン基(例えば-C(CF3)2-、-(CF2)p-(ここで、pは1~10の整数である))のようなハロゲン化アルキレン基のほかに、-CO-、-SO2-、-SO-、-CONH-、-COO-などが挙げられる。
(m31及びm32は、それぞれ独立に、0~2の整数であり、好ましくは0又は1である。m33及びm34は、それぞれ独立に、0~2の整数であり、好ましくは0又は1である。R21、R22、及びR23は、それぞれ独立に、炭素数1~4のアルキル基、炭素数2~4のアルケニル基、又は炭素数2~4のアルキニル基である。p21、p22及びp23は0~4の整数であり、好ましくは0である。L21は、単結合、エーテル基、カルボニル基又は炭素数1~4のアルキレン基である。)
なお、R3は少なくとも1つの芳香環を含む炭素数6~22の2価の基であるので、式(R3-1)におけるm31、m32、R21及びp21は、式(R3-1)で表される2価の基の炭素数が6~22の範囲に入るように選択される。
同様に、式(R3-2)におけるL21、m33、m34、R22、R23、p22及びp23は、式(R3-2)で表される2価の基の炭素数が12~22の範囲に入るように選択される。
(R4は-SO2-又は-Si(Rx)(Ry)O-を含む2価の基であり、Rx及びRyはそれぞれ独立に、炭素数1~3の鎖状脂肪族基又はフェニル基を表す。X4は少なくとも1つの芳香環を含む炭素数6~22の4価の基である。)
X4は、式(1)におけるX1と同様に定義され、好ましい様態も同様である。
該鎖状脂肪族基は、飽和であっても不飽和であってもよく、直鎖状であっても分岐状であってもよい。ポリイミド樹脂(A1)が上記特定の基を末端に有すると、耐熱老化性に優れる成形品を得ることができる。
炭素数5~14の飽和鎖状脂肪族基としては、n-ペンチル基、n-ヘキシル基、n-ヘプチル基、n-オクチル基、n-ノニル基、n-デシル基、n-ウンデシル基、ラウリル基、n-トリデシル基、n-テトラデシル基、イソペンチル基、ネオペンチル基、2-メチルペンチル基、2-メチルヘキシル基、2-エチルペンチル基、3-エチルペンチル基、イソオクチル基、2-エチルヘキシル基、3-エチルヘキシル基、イソノニル基、2-エチルオクチル基、イソデシル基、イソドデシル基、イソトリデシル基、イソテトラデシル基等が挙げられる。
炭素数5~14の不飽和鎖状脂肪族基としては、1-ペンテニル基、2-ペンテニル基、1-ヘキセニル基、2-ヘキセニル基、1-ヘプテニル基、2-ヘプテニル基、1-オクテニル基、2-オクテニル基、ノネニル基、デセニル基、ドデセニル基、トリデセニル基、テトラデセニル基等が挙げられる。
中でも、上記鎖状脂肪族基は飽和鎖状脂肪族基であることが好ましく、飽和直鎖状脂肪族基であることがより好ましい。また耐熱老化性を得る観点から、上記鎖状脂肪族基は好ましくは炭素数6以上、より好ましくは炭素数7以上、更に好ましくは炭素数8以上であり、好ましくは炭素数12以下、より好ましくは炭素数10以下、更に好ましくは炭素数9以下である。上記鎖状脂肪族基は1種のみでもよく、2種以上でもよい。
上記鎖状脂肪族基は、特に好ましくはn-オクチル基、イソオクチル基、2-エチルヘキシル基、n-ノニル基、イソノニル基、n-デシル基、及びイソデシル基からなる群から選ばれる少なくとも1種であり、更に好ましくはn-オクチル基、イソオクチル基、2-エチルヘキシル基、n-ノニル基、及びイソノニル基からなる群から選ばれる少なくとも1種であり、最も好ましくはn-オクチル基、イソオクチル基、及び2-エチルヘキシル基からなる群から選ばれる少なくとも1種である。
またポリイミド樹脂(A1)は、耐熱老化性の観点から、末端アミノ基及び末端カルボキシ基以外に、炭素数5~14の鎖状脂肪族基のみを末端に有することが好ましい。上記以外の基を末端に有する場合、その含有量は、好ましくは炭素数5~14の鎖状脂肪族基に対し10モル%以下、より好ましくは5モル%以下である。
ポリイミド樹脂(A1)中の上記炭素数5~14の鎖状脂肪族基の含有量は、ポリイミド樹脂(A1)を解重合することにより求めることができる。
ポリイミド樹脂(A1)の融点、ガラス転移温度は、いずれも示差走査型熱量計により測定することができ、具体的には実施例に記載の方法で測定できる。
またポリイミド樹脂(A1)は、結晶性、耐熱性、機械的強度、耐薬品性を向上させる観点から、示差走査型熱量計測定により、該ポリイミド樹脂を溶融後、降温速度20℃/分で冷却した際に観測される結晶化発熱ピークの熱量(以下、単に「結晶化発熱量」ともいう)が、5.0mJ/mg以上であることが好ましく、10.0mJ/mg以上であることがより好ましく、17.0mJ/mg以上であることが更に好ましい。結晶化発熱量の上限値は特に限定されないが、通常、45.0mJ/mg以下である。ポリイミド樹脂(A1)の結晶化発熱量は、具体的には実施例に記載の方法で測定できる。
μ=ln(ts/t0)/C
t0:濃硫酸の流れる時間
ts:ポリイミド樹脂溶液の流れる時間
C:0.5(g/dL)
ポリイミド樹脂(A1)の重量平均分子量Mwは、ポリメチルメタクリレート(PMMA)を標準試料としてゲルろ過クロマトグラフィー(GPC)法により測定することができる。
熱可塑性ポリイミド樹脂(A)は、テトラカルボン酸成分とジアミン成分とを反応させることにより製造することができる。以下、ポリイミド樹脂(A1)の製造方法を例として説明する。
ポリイミド樹脂(A1)の製造においては、該テトラカルボン酸成分は芳香族テトラカルボン酸及び/又はその誘導体を含有し、該ジアミン成分は少なくとも1つの脂環式炭化水素構造を含む脂肪族ジアミン及び鎖状脂肪族ジアミンを含有する。
鎖状脂肪族ジアミンは1種類あるいは複数を混合して使用してもよい。これらのうち、炭素数が8~10の鎖状脂肪族ジアミンが好適に使用でき、特に1,8-オクタメチレンジアミン及び1,10-デカメチレンジアミンからなる群から選ばれる少なくとも1種が好適に使用できる。
また、上記モル比は、25モル%以下であることが好ましく、結晶性を維持する観点からは、好ましくは20モル%以下、より好ましくは15モル%以下である。なお、上記モル比は、ポリイミド樹脂の着色を少なくする観点からは、好ましくは12モル%以下、より好ましくは10モル%以下、更に好ましくは5モル%以下、より更に好ましくは0モル%である。
中でも、末端封止剤としてはモノアミン類末端封止剤が好ましく、ポリイミド樹脂(A1)の末端に前述した炭素数5~14の鎖状脂肪族基を導入して耐熱老化性を向上させる観点から、炭素数5~14の鎖状脂肪族基を有するモノアミンがより好ましく、炭素数5~14の飽和直鎖状脂肪族基を有するモノアミンが更に好ましい。
末端封止剤は、特に好ましくはn-オクチルアミン、イソオクチルアミン、2-エチルヘキシルアミン、n-ノニルアミン、イソノニルアミン、n-デシルアミン、及びイソデシルアミンからなる群から選ばれる少なくとも1種であり、更に好ましくはn-オクチルアミン、イソオクチルアミン、2-エチルヘキシルアミン、n-ノニルアミン、及びイソノニルアミンからなる群から選ばれる少なくとも1種であり、最も好ましくはn-オクチルアミン、イソオクチルアミン、及び2-エチルヘキシルアミンからなる群から選ばれる少なくとも1種である。
本発明の熱可塑性ポリイミド樹脂組成物は、剛性向上の観点から、成分(B)として炭素繊維を含有する。
本発明の組成物に用いる成分(B)としては、例えばポリアクリロニトリル系炭素繊維、ピッチ系炭素繊維が挙げられる。炭素繊維の形態には特に制限はなく、得られる熱可塑性ポリイミド樹脂組成物及び成形品の形態に応じて、連続繊維、短繊維のいずれも用いることができ、両者を併用してもよい。
成分(B)の平均繊維径は、好ましくは1~100μm、より好ましくは3~50μm、更に好ましくは4~20μmである。成分(B)の平均繊維径がこの範囲であると、加工が容易であり、得られる成形品の剛性が優れたものとなる。
なお、成分(B)の平均繊維長(短繊維の場合)及び平均繊維径は、走査型電子顕微鏡(SEM)等により50本以上の繊維を無作為に選んで観察、計測し、個数平均を算出することにより求められる。
表面処理剤としては、例えば、エポキシ系材料、ウレタン系材料、アクリル系材料、ポリアミド系材料、ポリエステル系材料、ビニルエステル系材料、ポリオレフィン系材料、及びポリエーテル系材料が挙げられ、これらのうち1種又は2種以上を組み合わせて用いることができる。より高い剛性を得る観点からは、表面処理剤としてはエポキシ系材料及びウレタン系材料からなる群から選ばれる少なくとも1種が好ましい。
本発明の熱可塑性ポリイミド樹脂組成物は、摺動性向上の観点から、成分(C)としてフッ素樹脂を含有する。
本発明の組成物に用いる成分(C)としては、例えば、ポリテトラフルオロエチレン(PTFE)、ポリクロロトリフルオロエチレン(PCTFE)、ポリフッ化ビニリデン(PVDF)、テトラフルオロエチレンとヘキサフルオロプロピレンとの共重合体(FEP)、テトラフルオロエチレンとパーフルオロアルキルビニルエーテルとの共重合体(PFA)、テトラフルオロエチレンとエチレンとの共重合体(ETFE)、テトラフルオロエチレンとパーフルオロアルコキシエチレンとの共重合体、等が挙げられ、これらのうち1種又は2種以上を用いることができる。中でも、摺動性及び耐熱性向上の観点から、ポリテトラフルオロエチレンが好ましい。
上記平均粒径(D50)は、レーザー回折光散乱式粒度分布測定器により測定することができる。
本発明の熱可塑性ポリイミド樹脂組成物は、得られる成形品の比摩耗量を低減する観点から、成分(D)として無機充填材を含有する。なお本発明における成分(D)には、黒鉛、グラファイト等の、炭素原子のみからなる充填材は含まれないものとする。
本発明の組成物に用いる成分(D)の形状は特に限定されるものではなく、例えば球状、板状、繊維状のものが挙げられる。
成分(D)としては、例えば、シリカ、アルミナ、カオリナイト、ワラストナイト(ケイ酸カルシウム)、マイカ、タルク、クレー、セリサイト、炭酸マグネシウム、炭酸カルシウム、硫酸マグネシウム、酸化カルシウム、酸化チタン、炭化ケイ素、三硫化アンチモン、硫化錫、硫化銅、硫化鉄、硫化ビスマス、硫化亜鉛、金属粉末、ガラスパウダー、ガラスフレーク、ガラスビーズ、ガラスバルーン、金属繊維、シリカ繊維、シリカ・アルミナ繊維、アルミナ繊維、ジルコニア繊維、窒化ホウ素繊維、窒化珪素繊維、ホウ素繊維、チタン酸カリウムウィスカー、ホウ酸アルミニウムウィスカー、マグネシウム系ウィスカー、珪素系ウィスカー等が挙げられ、これらのうち1種又は2種以上を用いることができる。
また、繊維状の無機充填材の場合は、機械的強度向上、比摩耗量の低減、及び成分(A)への分散性向上の観点から、その平均繊維長は、好ましくは5~300μm、より好ましくは10~180μmであり、平均繊維径は、好ましくは0.1~100μm、より好ましくは0.2~50μm、更に好ましくは0.2~20μmである。繊維状の無機充填材の平均繊維長及び平均繊維径は、成分(B)と同様の方法で測定することができる。
本発明の熱可塑性ポリイミド樹脂組成物中の成分(A)~(D)の含有量は、剛性が高く、且つ、動摩擦係数が低く比摩耗量の少ない高摺動性の成形品を得る観点から、好ましくは以下の範囲である。
本発明の熱可塑性ポリイミド樹脂組成物は、黒色度、難燃性等の諸特性を付与する観点から、さらに成分(E)として黒鉛を含有することができる。
成分(E)として用いられる黒鉛は、天然黒鉛及び人造黒鉛のいずれでもよく、例えば、鱗片状黒鉛(Flake Graphite)、鱗状黒鉛(塊状黒鉛とも称されるVein Graphite)、土状黒鉛、球状黒鉛等の天然黒鉛、鱗片状黒鉛を濃硫酸等で化学処理した後に加熱して得られる膨張黒鉛、膨張黒鉛を高温で加熱処理することで得られる膨張化黒鉛、並びに人造黒鉛が挙げられる。
上記の中でも、成分(E)に用いる黒鉛としては天然黒鉛が好ましく、鱗片状黒鉛及び鱗状黒鉛からなる群から選ばれる1種以上がより好ましい。
成分(E)の平均粒径は特に制限されないが、黒色度、難燃性等の諸特性を向上させる観点、成分(A)への分散性及び取り扱い性の観点から、好ましくは1~50μm、より好ましくは2~40μm、更に好ましくは3~30μm、より更に好ましくは5~20μmである。
上記平均粒径は、成分(C)と同様の方法で測定することができる。
なお、得られる成形品の機械的強度及び摺動性向上を重視する場合は、熱可塑性ポリイミド樹脂組成物中の成分(E)の含有量は、好ましくは10質量%未満であり、より好ましくは5質量%以下である。
本発明の熱可塑性ポリイミド樹脂組成物には、艶消剤、核剤、可塑剤、帯電防止剤、着色防止剤、ゲル化防止剤、着色剤、酸化防止剤、導電剤、樹脂改質剤、難燃剤等の添加剤を、必要に応じて配合することができる。
上記添加剤の配合量には特に制限はないが、本発明の効果を損ねることなく添加剤の効果を発現させる観点から、熱可塑性ポリイミド樹脂組成物中、通常、50質量%以下、好ましくは35質量%以下であり、より好ましくは0.0001~30質量%、更に好ましくは0.001~15質量%、より更に好ましくは0.01~10質量%、より更に好ましくは0.01~5質量%である。
成分(A)以外の樹脂を併用する場合、熱可塑性ポリイミド樹脂組成物の特性が阻害されない範囲であれば、その配合比率には特に制限はない。
熱可塑性ポリイミド樹脂組成物からなるペレットは、例えば次のように作製することができる。まず、成分(C)、成分(D)、及び必要に応じて用いる成分(E)、その他各種任意成分を添加してドライブレンドする。次に、予め押出機内で溶融させた成分(A)に対し、該ドライブレンド物及び成分(B)をサイドフィードして溶融混練してストランドを押出し、ストランドをカットすることにより得ることができる。当該ペレットを各種成形機に導入して後述の方法で熱成形することにより、所望の形状を有する成形品を容易に製造することができる。
本発明は、前記熱可塑性ポリイミド樹脂組成物を含む成形品を提供する。
本発明の熱可塑性ポリイミド樹脂組成物は、成分(A)に由来する熱可塑性を有するため、熱成形することにより容易に本発明の成形品を製造できる。例えば、前記方法で得られた熱可塑性ポリイミド樹脂組成物のペレットを乾燥させた後、各種成形機に導入して熱成形し、所望の形状を有する成形品を製造することができる。熱成形方法としては射出成形、押出成形、シート押出成形、ブロー成形、熱プレス成形、真空成形、圧空成形、レーザー成形、インサート成形、溶接、溶着等が挙げられ、熱溶融工程を経る成形方法であればいずれの方法でも成形が可能である。中でも射出成形は、成形温度を例えば400℃を超える高温に設定することなく成形可能であるため好ましい。
また、各製造例及び実施例における各種測定、評価は以下のように行った。
熱可塑性ポリイミド樹脂のIR測定は日本電子(株)製「JIR-WINSPEC50」を用いて行った。
熱可塑性ポリイミド樹脂を190~200℃で2時間乾燥した後、該ポリイミド樹脂0.100gを濃硫酸(96%、関東化学(株)製)20mLに溶解したポリイミド樹脂溶液を測定試料とし、キャノンフェンスケ粘度計を使用して30℃において測定を行った。対数粘度μは下記式により求めた。
μ=ln(ts/t0)/C
t0:濃硫酸の流れる時間
ts:ポリイミド樹脂溶液の流れる時間
C:0.5g/dL
熱可塑性ポリイミド樹脂の融点Tm、ガラス転移温度Tg、結晶化温度Tc、及び結晶化発熱量ΔHmは、示差走査熱量計装置(エスアイアイ・ナノテクノロジー(株)製「DSC-6220」)を用いて測定した。
窒素雰囲気下、熱可塑性ポリイミド樹脂に下記条件の熱履歴を課した。熱履歴の条件は、昇温1度目(昇温速度10℃/分)、その後冷却(降温速度20℃/分)、その後昇温2度目(昇温速度10℃/分)である。
融点Tmは昇温2度目で観測された吸熱ピークのピークトップ値を読み取り決定した。ガラス転移温度Tgは昇温2度目で観測された値を読み取り決定した。結晶化温度Tcは冷却時に観測された発熱ピークのピークトップ値を読み取り決定した。
また結晶化発熱量ΔHm(mJ/mg)は冷却時に観測された発熱ピークの面積から算出した。
熱可塑性ポリイミド樹脂の半結晶化時間は、示差走査熱量計装置(エスアイアイ・ナノテクノロジー(株)製「DSC-6220」)を用いて測定した。
窒素雰囲気下、420℃で10分保持し、熱可塑性ポリイミド樹脂を完全に溶融させたのち、冷却速度70℃/分の急冷操作を行った際に、観測される結晶化ピークの出現時からピークトップに達するまでにかかった時間を計算した。なお表1中、半結晶化時間が20秒以下である場合は「<20」と表記した。
熱可塑性ポリイミド樹脂の重量平均分子量(Mw)は、昭和電工(株)製のゲルろ過クロマトグラフィー(GPC)測定装置「Shodex GPC-101」を用いて下記条件にて測定した。
カラム:Shodex HFIP-806M
移動相溶媒:トリフルオロ酢酸ナトリウム2mM含有HFIP
カラム温度:40℃
移動相流速:1.0mL/min
試料濃度:約0.1質量%
検出器:IR検出器
注入量:100μm
検量線:標準PMMA
各例で製造したペレットを150℃で6時間乾燥させた後、射出成形機(ファナック(株)製「ROBOSHOT α-S30iA」)を用いて、シリンダー温度380℃、金型温度200℃の条件で射出成形し、ISO多目的試験片を作製した。
射出成形において、樹脂流速は、ISO引張試験片中央部の断面積から計算して300mm/sとなるように設定した。また、射出条件は、金型に対し樹脂を約80%充填した時に二次圧(VP)切替となるように設定し、保圧に切り替えた。保圧は一次圧の80%で15秒とした。
ISO多目的試験片を80mm×10mm×4mm厚に切削後、ISO178に準拠して、前記切削試験片を用いて、温度23℃で曲げ強度(単位:MPa)及び曲げ弾性率(単位:GPa)を測定した。
各例で製造したペレットを150℃で6時間乾燥させた後、射出成形機(日精樹脂工業(株)製「PNX60」)を用いて、シリンダー温度385℃、金型温度200℃の条件で射出成形し、JIS K7218:1986 A法で規定する中空円筒試験片を作製した。
JIS K7218:1986 A法に準拠して、前記中空円筒試験片を用い、相手材としてS45C板を用いて、摩擦摩耗試験機((株)エー・アンド・デイ製「MODEL EMF-III-F」)により比摩耗量及び動摩擦係数を測定した。測定は23℃、50%R.H.環境下で、試験速度:0.5m/s、荷重:80N、試験時間:6時間の条件にて行った。
ディーンスターク装置、リービッヒ冷却管、熱電対、4枚パドル翼を設置した2Lセパラブルフラスコ中に2-(2-メトキシエトキシ)エタノール(日本乳化剤(株)製)500gとピロメリット酸二無水物(三菱ガス化学(株)製)218.12g(1.00mol)を導入し、窒素フローした後、均一な懸濁溶液になるように150rpmで撹拌した。一方で、500mLビーカーを用いて、1,3-ビス(アミノメチル)シクロヘキサン(三菱ガス化学(株)製、シス/トランス比=7/3)49.79g(0.35mol)、1,8-オクタメチレンジアミン(関東化学(株)製)93.77g(0.65mol)を2-(2-メトキシエトキシ)エタノール250gに溶解させ、混合ジアミン溶液を調製した。この混合ジアミン溶液を、プランジャーポンプを使用してフラスコ中に徐々に加えた。滴下により発熱が起こるが、内温は40~80℃に収まるよう調整した。混合ジアミン溶液の滴下中はすべて窒素フロー状態とし、撹拌翼回転数は250rpmとした。滴下が終わったのちに、2-(2-メトキシエトキシ)エタノール130gと、末端封止剤であるn-オクチルアミン(関東化学(株)製)1.284g(0.010mol)を加えさらに撹拌した。この段階で、淡黄色のポリアミド酸溶液が得られた。次に、撹拌速度を200rpmとした後に、2Lセパラブルフラスコ中のポリアミド酸溶液を190℃まで昇温した。昇温を行っていく過程において、液温度が120~140℃の間にポリイミド樹脂粉末の析出と、イミド化に伴う脱水が確認された。190℃で30分保持した後、室温まで放冷を行い、濾過を行った。得られたポリイミド樹脂粉末は2-(2-メトキシエトキシ)エタノール300gとメタノール300gにより洗浄、濾過を行った後、乾燥機で180℃、10時間乾燥を行い、317gの熱可塑性ポリイミド樹脂1の粉末を得た。
熱可塑性ポリイミド樹脂1のIRスペクトルを測定したところ、ν(C=O)1768、1697(cm-1)にイミド環の特性吸収が認められた。対数粘度は1.30dL/g、Tmは323℃、Tgは184℃、Tcは266℃、結晶化発熱量は21.0mJ/mg、半結晶化時間は20秒以下、Mwは55,000であった。
・PMDA;ピロメリット酸二無水物
・1,3-BAC;1,3-ビス(アミノメチル)シクロヘキサン
・OMDA;1,8-オクタメチレンジアミン
後述する表2に示す組成となるように、各成分をそれぞれ秤量した。フッ素樹脂、無機充填材、及び黒鉛はタンブラーにてブレンドした。二軸押出機((株)パーカーコーポレーション製「HK-25D」、スクリュー径25mmΦ、L/D=41)の根元から、製造例1で得られた熱可塑性ポリイミド樹脂1を投入し、溶融した後で、前記ブレンド成分、及び炭素繊維の順にサイドフィードして溶融混練し、ストランドを押し出した。押出機の温度設定は340℃、スクリュー回転数は150rpmとした。
押出機より押し出されたストランドを空冷後、ペレタイザー((株)星プラスチック製「ファンカッターFC-Mini-4/N」)によってペレット化し、樹脂組成物からなるペレット(比較例3は熱可塑性ポリイミド樹脂1からなるペレット)を作製した。
得られたペレットを用いて、前述の通り試験片を作製し、各種評価を行った。結果を表2に示す。
<(A)熱可塑性ポリイミド樹脂>
製造例1で得られた熱可塑性ポリイミド樹脂1
<(B)炭素繊維>
日本ポリマー産業(株)製「EX1-MC C-6」、サイジング剤:エポキシ系、サイジング剤量:3.0質量%、平均繊維径:7μm、平均繊維長:6mm、フィラメント数:12,000
<(C)フッ素樹脂>
(株)喜多村製「KT-600M」、ポリテトラフルオロエチレン粉末、平均粒径(D50):14μm
<(D)無機充填材>
(D1)IMERYS社製「NYGLOS8 10013」、ワラストナイト、平均繊維径:12μm、平均繊維長:156μm
(D2)IMERYS社製「NYAD M1250」、ワラストナイト、平均繊維径:4μm、平均繊維長:12μm
(D3)日東粉化工業(株)製「炭酸カルシウム NS#100」、平均粒径:2.1μm
(D4)大塚化学(株)製「ティスモ D-102」、平均繊維径:0.3~0.6μm、平均繊維長10~20μm
<(E)黒鉛>
(株)中越黒鉛工業所製「BF-10AK」、鱗状黒鉛、平均粒径(D50):10μm
Claims (9)
- 熱可塑性ポリイミド樹脂(A)30~60質量%、炭素繊維(B)5~50質量%、フッ素樹脂(C)5~20質量%、及び、無機充填材(D)1~40質量%を含有する熱可塑性ポリイミド樹脂組成物。
- 前記成分(D)がカルシウム元素を含有する無機充填材である、請求項1に記載の熱可塑性ポリイミド樹脂組成物。
- 前記成分(D)が炭酸カルシウム及びワラストナイトからなる群から選ばれる少なくとも1種である、請求項1又は2に記載の熱可塑性ポリイミド樹脂組成物。
- 前記熱可塑性ポリイミド樹脂組成物中の前記成分(D)の含有量が5~30質量%である、請求項1~3のいずれか1項に記載の熱可塑性ポリイミド樹脂組成物。
- 前記熱可塑性ポリイミド樹脂組成物中の前記成分(B)の含有量が10~30質量%である、請求項1~4のいずれか1項に記載の熱可塑性ポリイミド樹脂組成物。
- 前記成分(C)がポリテトラフルオロエチレンである、請求項1~5のいずれか1項に記載の熱可塑性ポリイミド樹脂組成物。
- さらに黒鉛(E)を0.1~15質量%含有する、請求項1~6のいずれか1項に記載の熱可塑性ポリイミド樹脂組成物。
- 請求項1~8のいずれか1項に記載の熱可塑性ポリイミド樹脂組成物を含む成形品。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/554,844 US20240209207A1 (en) | 2021-04-15 | 2022-03-17 | Thermoplastic polyimide resin composition and molded product |
| JP2023514532A JPWO2022220007A1 (ja) | 2021-04-15 | 2022-03-17 | |
| KR1020237034639A KR20230169151A (ko) | 2021-04-15 | 2022-03-17 | 열가소성 폴리이미드 수지 조성물 및 성형품 |
| CN202280027890.8A CN117178025A (zh) | 2021-04-15 | 2022-03-17 | 热塑性聚酰亚胺树脂组合物和成形品 |
| EP22787933.5A EP4324883A4 (en) | 2021-04-15 | 2022-03-17 | THERMOPLASTIC POLYIMIDE RESIN COMPOSITION AND MOLDED PRODUCT |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021069111 | 2021-04-15 | ||
| JP2021-069111 | 2021-04-15 |
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| Publication Number | Publication Date |
|---|---|
| WO2022220007A1 true WO2022220007A1 (ja) | 2022-10-20 |
Family
ID=83640562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2022/012143 Ceased WO2022220007A1 (ja) | 2021-04-15 | 2022-03-17 | 熱可塑性ポリイミド樹脂組成物及び成形品 |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20240209207A1 (ja) |
| EP (1) | EP4324883A4 (ja) |
| JP (1) | JPWO2022220007A1 (ja) |
| KR (1) | KR20230169151A (ja) |
| CN (1) | CN117178025A (ja) |
| TW (1) | TW202307133A (ja) |
| WO (1) | WO2022220007A1 (ja) |
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|---|---|---|---|---|
| JPS638455A (ja) * | 1986-06-30 | 1988-01-14 | Mitsui Toatsu Chem Inc | ポリイミド樹脂組成物 |
| JPH05161368A (ja) * | 1991-11-29 | 1993-06-25 | Canon Inc | 振動波モータ |
| JPH05262976A (ja) * | 1991-12-25 | 1993-10-12 | Ntn Corp | オイルシールリング |
| JPH0881629A (ja) * | 1994-09-13 | 1996-03-26 | Mitsui Toatsu Chem Inc | オイルシールリング |
| WO2012070401A1 (ja) * | 2010-11-24 | 2012-05-31 | 旭硝子株式会社 | シート状記録材剥離用摺動部材、自動車用シールリング、並びに、産業ガス圧縮機用シールリング及び摺動部材 |
| WO2015020020A1 (ja) * | 2013-08-06 | 2015-02-12 | 三菱瓦斯化学株式会社 | ポリイミド樹脂組成物及びポリイミド樹脂-繊維複合材 |
| WO2016147996A1 (ja) | 2015-03-19 | 2016-09-22 | 三菱瓦斯化学株式会社 | ポリイミド樹脂 |
| WO2021024625A1 (ja) * | 2019-08-08 | 2021-02-11 | 三菱瓦斯化学株式会社 | ポリイミド樹脂組成物及び成形体 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4443870B2 (ja) | 2003-07-07 | 2010-03-31 | 克雄 庄司 | 超砥粒ホイール及びその製造方法 |
| JP2006225433A (ja) * | 2005-02-15 | 2006-08-31 | Kurabo Ind Ltd | 摺動部材用樹脂組成物および摺動部材 |
| ES2549149T3 (es) | 2012-02-08 | 2015-10-23 | Mitsubishi Gas Chemical Company, Inc. | Resina de poliimida termoplástica cristalina |
| DE102012104308A1 (de) * | 2012-05-18 | 2013-11-21 | Ensinger Gmbh | Polymerwerkstoff, insbesondere für tribologische Anwendungen |
| US12466935B2 (en) | 2019-08-08 | 2025-11-11 | Mitsubishi Gas Chemical Company, Inc. | Flame-retardant polyimide shaping material and shaped body |
-
2022
- 2022-03-17 WO PCT/JP2022/012143 patent/WO2022220007A1/ja not_active Ceased
- 2022-03-17 US US18/554,844 patent/US20240209207A1/en active Pending
- 2022-03-17 EP EP22787933.5A patent/EP4324883A4/en active Pending
- 2022-03-17 JP JP2023514532A patent/JPWO2022220007A1/ja active Pending
- 2022-03-17 CN CN202280027890.8A patent/CN117178025A/zh active Pending
- 2022-03-17 KR KR1020237034639A patent/KR20230169151A/ko active Pending
- 2022-03-17 TW TW111109804A patent/TW202307133A/zh unknown
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| JPS638455A (ja) * | 1986-06-30 | 1988-01-14 | Mitsui Toatsu Chem Inc | ポリイミド樹脂組成物 |
| JPH05161368A (ja) * | 1991-11-29 | 1993-06-25 | Canon Inc | 振動波モータ |
| JPH05262976A (ja) * | 1991-12-25 | 1993-10-12 | Ntn Corp | オイルシールリング |
| JPH0881629A (ja) * | 1994-09-13 | 1996-03-26 | Mitsui Toatsu Chem Inc | オイルシールリング |
| WO2012070401A1 (ja) * | 2010-11-24 | 2012-05-31 | 旭硝子株式会社 | シート状記録材剥離用摺動部材、自動車用シールリング、並びに、産業ガス圧縮機用シールリング及び摺動部材 |
| WO2015020020A1 (ja) * | 2013-08-06 | 2015-02-12 | 三菱瓦斯化学株式会社 | ポリイミド樹脂組成物及びポリイミド樹脂-繊維複合材 |
| WO2016147996A1 (ja) | 2015-03-19 | 2016-09-22 | 三菱瓦斯化学株式会社 | ポリイミド樹脂 |
| WO2021024625A1 (ja) * | 2019-08-08 | 2021-02-11 | 三菱瓦斯化学株式会社 | ポリイミド樹脂組成物及び成形体 |
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| Title |
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| See also references of EP4324883A4 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4324883A4 (en) | 2024-11-06 |
| EP4324883A1 (en) | 2024-02-21 |
| TW202307133A (zh) | 2023-02-16 |
| KR20230169151A (ko) | 2023-12-15 |
| CN117178025A (zh) | 2023-12-05 |
| JPWO2022220007A1 (ja) | 2022-10-20 |
| US20240209207A1 (en) | 2024-06-27 |
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