WO2014199724A1 - 溶媒可溶型ポリイミド共重合体 - Google Patents
溶媒可溶型ポリイミド共重合体 Download PDFInfo
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- WO2014199724A1 WO2014199724A1 PCT/JP2014/060976 JP2014060976W WO2014199724A1 WO 2014199724 A1 WO2014199724 A1 WO 2014199724A1 JP 2014060976 W JP2014060976 W JP 2014060976W WO 2014199724 A1 WO2014199724 A1 WO 2014199724A1
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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
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
-
- 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
-
- 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
- C08G73/1046—Polyimides containing oxygen in the form of ether bonds in the main chain
- C08G73/105—Polyimides containing oxygen in the form of ether bonds in the main chain with oxygen only in the diamino moiety
-
- 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
- C08G73/1057—Polyimides containing other atoms than carbon, hydrogen, nitrogen or oxygen in the main chain
- C08G73/1064—Polyimides containing other atoms than carbon, hydrogen, nitrogen or oxygen in the main chain containing sulfur
-
- 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
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
- C08G73/1071—Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D179/00—Coating compositions based on 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 C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09D179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J179/00—Adhesives based on 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 C09J161/00 - C09J177/00
- C09J179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09J179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
Definitions
- the present invention relates to a solvent-soluble polyimide copolymer (hereinafter, also simply referred to as “polyimide copolymer”). Specifically, the present invention relates to a solvent that is highly satisfactory in storage stability and heat resistance and excellent in practicality. The present invention relates to a melt-type polyimide copolymer.
- Polyimide is a polymer material with the highest level of heat resistance, chemical resistance, and electrical insulation among organic materials, synthesized from pyromellitic dianhydride (PMDA) and 4,4'-diaminodiphenyl ether (pDADE).
- PMDA pyromellitic dianhydride
- pDADE 4,4'-diaminodiphenyl ether
- BPDA biphenyltetracarboxylic dianhydride
- pPD paraphenylenediamine
- the polyimide film is prepared by dissolving an acid dianhydride having two acid anhydride groups in the molecule and a diamine having two amino groups in the molecule in a solvent to obtain a polyimide precursor varnish called polyamic acid. It is synthesized by applying and drying this precursor varnish and heating at about 350 ° C. Conventionally, there is a high demand for handling polyimide in a solution state, and many developments have been made on solvent-soluble polyimides.
- Patent Literature 1 and Patent Literature 2 can be cited as techniques relating to a solvent-soluble polyimide.
- the polyimide copolymer obtained according to Patent Documents 1 and 2 has reduced heat resistance and mechanical strength as a compensation for solubilization in an organic solvent.
- heat resistance and mechanical strength are improved in order to improve these problems, it is difficult to maintain a state dissolved in an organic solvent, and storage stability is reduced. The current situation is that it is not satisfactory.
- an object of the present invention is to provide a solvent-soluble polyimide copolymer that is highly satisfactory in storage stability and heat resistance and excellent in practicality.
- the present inventor has obtained a polyimide in which a glass transition point is not observed below 500 ° C. by copolymerizing a predetermined acid dianhydride and a diamine and / or diisocyanate.
- the inventors have found that a copolymer can be obtained, and have completed the present invention.
- the solvent-soluble polyimide copolymer of the present invention is a copolymer of (A) 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride and (B) diamine and / or diisocyanate.
- the glass transition point is not observed below 500 ° C.
- the component (B) has the following general formulas (1) to (3), Wherein X is an amino group or an isocyanate group, R 1 to R 8 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, or 1 to 4 carbon atoms. And at least one of R 1 to R 8 is not a hydrogen atom) and is preferably one or more diamines and / or diisocyanates. In the solvent-soluble polyimide copolymer of the present invention, it is preferable that two of R 1 to R 4 are ethyl groups, and the remaining two are methyl groups and hydrogen atoms. Further, R 5 to R 8 are preferably a methyl group or an ethyl group.
- the solvent-soluble polyimide copolymer of the present invention is obtained by copolymerizing (A) 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride and (B) diamine and / or diisocyanate. It will be.
- the polyimide copolymer has a glass transition point higher than that of a conventional polyimide copolymer, and the glass transition point is not observed below 500 ° C. and is excellent in heat resistance. Moreover, it has the advantage that it is excellent also in storage stability.
- (B) diamine and / or diisocyanate are not particularly limited, and known ones can be used.
- R 21 to R 24 are each independently an alkyl group having 1 to 4 carbon atoms or a phenyl group
- R 31 and R 32 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, and a carbon number 2 It is preferably at least one selected from the group represented by: an alkenyl group having 4 to 4, an alkoxy group having 1 to 4 carbon atoms, a hydroxyl group, a carboxy group, or a trifluoromethyl group.
- the component (B) is, in particular, the following general formulas (1) to (3), Wherein X is an amino group or an isocyanate group, R 1 to R 8 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, or 1 to 4 carbon atoms. And at least one of R 1 to R 8 is not a hydrogen atom) and is preferably one or more diamines and / or diisocyanates. Among these, two of R 1 to R 4 in the above general formulas (1) to (2), which are easily available and inexpensive, and can achieve the effects of the present invention, are ethyl groups.
- R 5 to R 8 are preferably a methyl group or an ethyl group.
- the second acid dianhydride is not particularly limited as long as it is an acid dianhydride conventionally used in the production of polyimide, but 4,4′-oxydiphthalic dianhydride, 3,3 ′ , 4,4′-Diphenylsulfonetetracarboxylic dianhydride, 3,3 ′, 4,4′-benzophenonetetracarboxylic dianhydride, 2,2′-bis [(dicarboxyphenoxy) phenyl] propane dianhydride , Ethylene glycol bistrimellitic anhydride ester, pyromellitic dianhydride, 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride can be suitably used.
- (C) As a 2nd acid dianhydride you may use by 1 type, However, You may mix and use 2 or more types of acid dianhydrides.
- the amount of the (C) second acid dianhydride is preferably 1.5 mol or less per 1 mol of the component (A).
- the component (A) and the component (B) may be copolymerized.
- a polyimide copolymer oligomer having a mass average molecular weight of about 550 to 16,000 is produced, and the obtained polyimide copolymer oligomer;
- the second acid dianhydride or (D) the second diamine and / or diisocyanate may be copolymerized for production.
- the (D) second diamine and / or diisocyanate those usually used for the production of polyimide copolymers can be used as long as the effects of the present invention are not impaired.
- the same component as component B) may be used.
- D) When using what differs from the said (B) component as a 2nd diamine and / or diisocyanate, the amount is 2 mol or less with respect to 1 mol of (B) components.
- the mass average molecular weight is preferably 20,000 to 200,000, more preferably 35,000 to 150,000.
- the concentration of the polyimide copolymer in the organic solvent is not particularly limited, but can be, for example, about 5 to 35% by mass. Even if the concentration of the polyimide copolymer is less than 5% by mass, it can be used. However, if the concentration is dilute, the work efficiency of polyimide copolymer coating and the like deteriorates. On the other hand, when it exceeds 35% by mass, the fluidity of the polyimide copolymer is poor, application and the like become difficult, and workability is deteriorated.
- the polyimide copolymer of the present invention can be dissolved in an organic solvent.
- organic solvent examples include N-methyl-2-pyrrolidone, N, N-dimethylacetamide, sulfolane, N, N-dimethylformamide.
- These organic solvents may be used alone or in combination of two or more.
- the production method is not particularly limited, and a known method can be used.
- the method of forming a film, film or sheet examples include a method in which the solvent is distilled off to form a molded body after injection into a mold.
- the polyimide copolymer of the present invention is known according to its viscosity and the like, such as spin coating method, dipping method, spraying method, casting method, etc. After applying to the surface of the substrate by the above method, it may be dried.
- any material may be used according to the use of the final product.
- textile products such as cloth, glass, polyethylene terephthalate, polyethylene naphthalate, polyethylene, polycarbonate, triacetyl cellulose, cellophane, polyimide, polyamide, polyphenylene sulfide, polyetherimide, polyethersulfone, aromatic polyamide, polysulfone, etc.
- Examples include synthetic resins, metals, ceramics, papers and the like.
- the base material may be colored by blending various pigments and dyes with the material constituting the base material, or the base material surface is coated with a resin blended with various pigments and dyes It may be.
- the surface may be subjected to physical etching such as sandblasting or chemical etching with a chemical solution, or mat-like processing such as forming irregularities by applying a resin containing filler, plasma treatment, corona treatment, primer
- An easily adhesive layer may be formed by coating or the like.
- an ordinary heating and drying furnace may be used.
- the atmosphere in the drying furnace include air and inert gas (nitrogen, argon).
- the drying temperature can be appropriately selected depending on the boiling point of the solvent in which the polyimide copolymer of the present invention is dissolved, but is usually 80 to 350 ° C., preferably 100 to 320 ° C., particularly preferably 120 to 250 ° C. That's fine.
- the drying time may be appropriately selected depending on the thickness, concentration, and type of solvent, and may be about 1 second to 360 minutes.
- a product having the polyimide copolymer of the present invention as a film can be obtained as it is, or a film can be obtained by separating the film from the substrate.
- fillers such as silica, alumina, mica, carbon powder, pigments, dyes, polymerization inhibitors, thickeners, thixotropic agents, precipitation inhibitors Antioxidants, dispersants, pH adjusters, surfactants, various organic solvents, various resins, and the like can be added.
- a molded body is obtained using a mold, a predetermined amount of the polyimide copolymer of the present invention is injected into the mold (especially a rotating mold is preferable), and then the same temperature as the molding conditions of the film, A molded body can be obtained by drying over time.
- the polyimide copolymer of the present invention is excellent in heat resistance, it is useful for coating agents, adhesives, insulation coating materials such as electric wires, inks, paints, interlayer insulation films, ultra-thin films, etc. that require heat resistance. is there.
- the polyimide copolymer of the present invention can be obtained by copolymerizing the component (A) and the component (B). As described above, in producing the polyimide copolymer of the present invention, As long as the effect of the present invention is not impaired, (C) the second acid dianhydride may be added as an acid dianhydride other than the component (A).
- the polymerization temperature and the polymerization time are preferably 150 to 200 ° C. and 60 to 600 minutes. If the polymerization temperature exceeds 200 ° C., it is not preferable because oxidation of the solvent and unreacted raw materials and increase of the resin concentration accompanying the volatilization of the solvent occur. On the other hand, if it is lower than 150 ° C., the imidization reaction may not proceed or may not be completed, which is not preferable.
- the copolymerization is carried out in an organic solvent, and the organic solvent used in that case is not particularly limited.
- organic solvent used in that case is not particularly limited.
- N-methyl-2-pyrrolidone, N, N-dimethylacetamide, sulfolane, N, N-dimethylformamide, N, N-diethylacetamide, etc., gamma-butyrolactone, alkylene glycol monoalkyl ether, alkylene glycol dialkyl ether, alkyl Carbitol acetate and benzoate can be preferably used.
- These organic solvents may be used alone or in combination of two or more.
- a known imidization catalyst can be used.
- pyridine may generally be used as an imidization catalyst, but in addition to this, substituted or unsubstituted nitrogen-containing heterocyclic compounds, N-oxide compounds of nitrogen-containing heterocyclic compounds, substituted or unsubstituted amino acids Compounds, aromatic hydrocarbon compounds having an aromatic group, or aromatic heterocyclic compounds, particularly 1,2-dimethylimidazole, N-methylimidazole, N-benzyl-2-methylimidazole, 2-methylimidazole, 2- Lower alkyl imidazoles such as ethyl-4-methylimidazole and 5-methylbenzimidazole, imidazole derivatives such as N-benzyl-2-methylimidazole, isoquinoline, 3,5-dimethylpyridine, 3,4-dimethylpyridine, 2,5 -Dimethylpyridine, 2,4-dimethylpyridine, 4 Substituted pyridine
- the amount of the imidization catalyst used is preferably about 0.01 to 2 times equivalent, particularly about 0.02 to 1 time equivalent to the amic acid unit of the polyamic acid.
- an azeotropic solvent can be added to the organic solvent in order to efficiently remove water generated by the imidization reaction.
- aromatic hydrocarbons such as toluene, xylene, and solvent naphtha
- alicyclic hydrocarbons such as cyclohexane, methylcyclosexane, and dimethylcyclohexane
- the amount added is about 1 to 30% by mass, preferably 5 to 20% by mass, based on the total amount of organic solvent.
- the polyimide copolymer of the present invention is produced by a chemical imidization method, in the copolymer production process in which the component (A) and the component (B) are copolymerized, for example, in an organic solvent, such as acetic anhydride. After adding a dehydrating agent and a catalyst such as triethylamine, pyridine, picoline or quinoline to the polyamic acid solution, the same operation as in the thermal imidization method is performed. Thereby, the polyimide copolymer of this invention can be obtained.
- the polymerization temperature and the polymerization time are preferably 1 to 200 hours in a temperature range of from ordinary temperature to about 150 ° C.
- a dehydrating agent is used, but an organic acid anhydride such as an aliphatic acid anhydride, an aromatic acid anhydride, an alicyclic acid anhydride, a heterocyclic acid is used.
- An anhydride or a mixture of two or more thereof may be mentioned.
- Specific examples of the organic acid anhydride include acetic anhydride and the like.
- an imidization catalyst and an organic solvent are used, but the same one as in the thermal imidization method can be used.
- the polymerization method may be carried out by any known method and is not particularly limited.
- the method may be a method in which the whole amount of the component (A) is put in an organic solvent, and then the component (B) is added to the organic solvent in which the component (A) is dissolved to polymerize.
- a method may be employed in which the total amount of the components is put in an organic solvent and then added to the organic solvent in which the component (A) is dissolved for polymerization.
- the component (A) and the component (B) are copolymerized to produce a polyimide copolymer oligomer, and the resulting polyimide copolymer oligomer is used to produce a polyimide copolymer.
- the second diamine and / or diisocyanate may be copolymerized with the polyimide copolymer oligomer together with (C) the second acid dianhydride.
- the (C) second acid dianhydride As the (C) second acid dianhydride, (D) the second diamine and / or diisocyanate, those described above can be used.
- an organic solvent As an organic solvent, a catalyst, an azeotropic solvent and a dehydrating agent used when producing the polyimide copolymer oligomer, an organic solvent, a catalyst, and a catalyst used for producing the polyimide copolymer of the present invention based on each imidization method, An azeotropic solvent and a dehydrating agent can be appropriately selected and used.
- the polymerization temperature is 150 to 200 ° C. in the case of the thermal imidization method. If the polymerization temperature is less than 150 ° C., imidation may not proceed or may not be completed. On the other hand, if it exceeds 200 ° C., the oxidation of the solvent and unreacted raw materials and the increase in the resin concentration due to the volatilization of the solvent. This is because it occurs.
- the temperature is preferably 160 to 195 ° C.
- Example 1 In a 500 mL separable four-necked flask equipped with a stainless steel vertical agitator, nitrogen inlet tube, and Dean-Stark apparatus, 66.52 g (0.225 mol) of BPDA, 32.09 g of DETDA (0.18 mol), N-methyl -2-Pyrrolidone (NMP) 100 g, pyridine 3.56 g, and toluene 50 g were charged, and the inside of the reaction system was purged with nitrogen. BPDA was dissolved by stirring at 80 ° C. for 30 minutes under a nitrogen stream, and then heated to 180 ° C. and stirred for 2 hours. Water produced by the reaction was distilled out of the reaction system by azeotropy with toluene.
- NMP N-methyl -2-Pyrrolidone
- R is a methyl group or an ethyl group
- Example 2 In the same apparatus as in Example 1, 41.49 g (0.141 mol) of BPDA, 33.52 g (0.188 mol) of DETDA, 84.89 g of NMP, 3.72 g of pyridine, and 50 g of toluene were charged, and the inside of the reaction system was purged with nitrogen. BPDA was dissolved by stirring at 80 ° C. for 30 minutes under a nitrogen stream, and then heated to 180 ° C. and stirred for 2 hours. Water produced by the reaction was distilled out of the reaction system by azeotropy with toluene.
- R is a methyl group or an ethyl group
- Example 3 In the same apparatus as in Example 1, 40.60 g (0.138 mol) of BPDA, 16.40 g (0.092 mol) of DETDA, 83.69 g of NMP, 2.91 g of pyridine, and 50 g of toluene were charged, and the inside of the reaction system was purged with nitrogen. BPDA was dissolved by stirring at 80 ° C. for 30 minutes under a nitrogen stream, and then heated to 180 ° C. and stirred for 2 hours. Water produced by the reaction was distilled out of the reaction system by azeotropy with toluene.
- R is a methyl group or an ethyl group
- Example 4 In the same apparatus as in Example 1, 36.19 g (0.123 mol) of BPDA, 25.46 g (0.082 mol) of 4,4′-methylenebis (2,6-diethylaniline) (M-DEA), 83.86 g of NMP Then, 2.60 g of pyridine and 50 g of toluene were charged, and the inside of the reaction system was purged with nitrogen. BPDA was dissolved by stirring at 80 ° C. for 30 minutes under a nitrogen stream, and then heated to 180 ° C. and stirred for 2 hours. Water produced by the reaction was distilled out of the reaction system by azeotropy with toluene.
- M-DEA 4,4′-methylenebis (2,6-diethylaniline)
- Example 5 In the same apparatus as in Example 1, 35.31 g (0.12 mol) of BPDA, 21.39 g (0.12 mol) of DETDA, 209.50 g of NMP, 1.90 g of pyridine and 50 g of toluene were charged, and the inside of the reaction system was purged with nitrogen. BPDA was dissolved by stirring at 80 ° C. for 30 minutes under a nitrogen stream, and then heated to 180 ° C. and stirred for 6 hours. Water generated during the reaction was removed from the reaction system as an azeotrope with toluene and pyridine. After completion of the reaction, the mixture was cooled to 120 ° C. to obtain a 20% by mass polyimide solution. The structure of the obtained polyimide copolymer is as shown in the following formula (18).
- R is a methyl group or an ethyl group
- Example 6 In the same apparatus as in Example 1, BPDA 47.08 g (0.16 mol), PMDA 17.68 g (0.08 mol), DETDA 42.79 g (0.24 mol), NMP 183.23 g, pyridine 3.8 g, and toluene 50 g were added. The reaction system was charged with nitrogen. BPDA and PMDA were dissolved by stirring at 80 ° C. for 30 minutes under a nitrogen stream, and then heated to 180 ° C. and stirred for 6 hours. Water generated during the reaction was removed from the reaction system as an azeotrope with toluene and pyridine. After completion of the reaction, when cooled to 120 ° C., 112.76 g of NMP was added to obtain a polyimide solution having a concentration of 25% by mass. The structure of the obtained polyimide copolymer is as the following formula (19).
- R is a methyl group or an ethyl group
- the glass transition temperature was measured using the film prepared in the film formability evaluation.
- the measurement used DSC6200 (made by Seiko Instruments Inc.). Incidentally, 10 ° C./min.
- the glass transition temperature was heated to 500 ° C., and the glass transition temperature was the midpoint glass transition temperature. The obtained results are shown in Tables 1 and 2.
- the film prepared by the film formability evaluation was processed into a test piece having a length of 100 mm ⁇ 10 mm, and the tensile modulus, the stress at break, and the elongation at break were measured using a creep meter (RE2-30005B manufactured by Yamaden Co., Ltd.). The measurement was performed 5 times, and data showing the maximum stress at break was used. The distance between chucks is 50 mm, and the pulling speed is 5 mm / sec. It was.
- the polyimide copolymer of the present invention is soluble in a solvent but does not have a glass transition point of less than 500 ° C. and exhibits excellent heat resistance. Moreover, it turns out that it has sufficient mechanical strength. On the other hand, since Comparative Examples 1 and 2 do not have a structure in which the component (A) and the component (B) are polymerized, both the glass transition point and the mechanical strength are low, so that it cannot be practically used.
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Abstract
Description
(式中、Xはアミノ基またはイソシアネート基、R1~R8は、それぞれ独立して水素原子、炭素数1~4のアルキル基、炭素数2~4のアルケニル基、または炭素数1~4のアルコキシ基であり、R1~R8のうち少なくとも一つは水素原子ではない)で表される1種以上のジアミンおよび/またはジイソシアネートであることが好ましい。また、本発明の溶媒可溶型ポリイミド共重合体においては、前記R1~R4のうち2個がエチル基であり、残り2個がメチル基と水素原子であることが好ましい。さらに、前記R5~R8は、メチル基またはエチル基であることが好ましい。
本発明の溶媒可溶型ポリイミド共重合体は、(A)3,3’,4,4’-ビフェニルテトラカルボン酸二無水物と、(B)ジアミンおよび/またはジイソシアネートと、が共重合されてなるものである。上記ポリイミド共重合体は、従来のポリイミド共重合体と比較してガラス転移点が高く、500℃未満ではガラス転移点が観測されず耐熱性に優れている。また、貯蔵安定性にも優れているという利点も有している。
(式中、Xはアミノ基またはイソシアネート基、R11~R14は、それぞれ独立して水素原子、炭素数1~4のアルキル基、炭素数2~4のアルケニル基、炭素数1~4のアルコキシ基、水酸基、カルボキシ基、またはトリフルオロメチル基、YおよびZは、
R21~R24は、それぞれ独立して炭素数1~4のアルキル基またはフェニル基であり、R31およびR32はそれぞれ独立して水素原子、炭素数1~4のアルキル基、炭素数2~4のアルケニル基、炭素数1~4のアルコキシ基、水酸基、カルボキシ基、またはトリフルオロメチル基である)で表される群から選ばれる少なくとも1種であることが好ましい。
(式中、Xはアミノ基またはイソシアネート基、R1~R8は、それぞれ独立して水素原子、炭素数1~4のアルキル基、炭素数2~4のアルケニル基、または炭素数1~4のアルコキシ基であり、R1~R8のうち少なくとも一つは水素原子ではない)で表される1種以上のジアミンおよび/またはジイソシアネートであることが好ましい。これらの中でも、入手が容易で安価であり、かつ、本発明の効果を良好に得ることができる、上記一般式(1)~(2)中のR1~R4のうち2個がエチル基であり、残り2個がメチル基と水素原子であるジエチルトルエンジアミン(DETDA)が好ましい。上記一般式(3)中のR5~R8はメチル基またはエチル基であることが好ましい。
本発明のポリイミド共重合体は、上記(A)成分と(B)成分とを共重合させることにより得ることができるが、上述のとおり、本発明のポリイミド共重合体を製造するに当たっては、上記本発明の効果を損なわない範囲で、(A)成分以外の酸二無水物として(C)第2の酸二無水物を添加してもよい。
本発明のポリイミド共重合体を化学イミド化法により製造する場合、上記(A)成分と上記(B)成分とを共重合させる共重合体製造工程において、例えば、有機溶媒中、無水酢酸等の脱水剤と、トリエチルアミン、ピリジン、ピコリン又はキノリン等の触媒とを、ポリアミド酸溶液に添加した後、熱イミド化法と同様の操作を行う。これにより、本発明のポリイミド共重合体を得ることができる。本発明のポリイミド共重合体を化学イミド化法により製造する場合における重合温度および重合時間は、好適には通常常温から150℃程度の温度範囲で1~200時間である。
本発明のポリイミド共重合体の製造においては、重合方法は公知のいずれの方法で行ってもよく、特に限定されるものではない。例えば、(A)成分全量を有機溶媒中に入れ、その後、(B)成分を(A)成分を溶解させた有機溶媒に加えて重合する方法であってもよく、また、先に(B)成分全量を有機溶媒中に入れ、その後、(A)成分を溶解させた有機溶媒に加えて重合する方法であってもよい。
<実施例1>
ステンレススチール製錨型撹拌機、窒素導入管、ディーン・スターク装置を取り付けた500mLのセパラブル4つ口フラスコにBPDA66.52g(0.225モル)、DETDA32.09g(0.18モル)、N-メチル-2-ピロリドン(NMP)100g、ピリジン3.56g、トルエン50gを仕込み、反応系内を窒素置換した。窒素気流下80℃にて30分間撹拌することによりBPDAを溶解させ、その後180℃まで昇温して2時間加熱撹拌をおこなった。反応によって生成した水は、トルエンとの共沸によって反応系外へ留去した。
実施例1と同様の装置にBPDA41.49g(0.141モル)、DETDA33.52g(0.188モル)、NMP84.89g、ピリジン3.72g、トルエン50gを仕込み、反応系内を窒素置換した。窒素気流下80℃にて30分間撹拌することによりBPDAを溶解させ、その後180℃まで昇温して2時間加熱撹拌をおこなった。反応によって生成した水は、トルエンとの共沸によって反応系外へ留去した。
実施例1と同様の装置にBPDA40.60g(0.138モル)、DETDA16.40g(0.092モル)、NMP83.69g、ピリジン2.91g、トルエン50gを仕込み、反応系内を窒素置換した。窒素気流下80℃にて30分間撹拌することによりBPDAを溶解させ、その後180℃まで昇温して2時間加熱撹拌をおこなった。反応によって生成した水は、トルエンとの共沸によって反応系外へ留去した。
実施例1と同様の装置にBPDA36.19g(0.123モル)、4,4’-メチレンビス(2,6-ジエチルアニリン)(M-DEA)25.46g(0.082モル)、NMP83.86g、ピリジン2.60g、トルエン50gを仕込み、反応系内を窒素置換した。窒素気流下80℃にて30分間撹拌することによりBPDAを溶解させ、その後180℃まで昇温して2時間加熱撹拌をおこなった。反応によって生成した水は、トルエンとの共沸によって反応系外へ留去した。
実施例1と同様の装置にBPDA35.31g(0.12モル)、DETDA21.39g(0.12モル)、NMP209.50g、ピリジン1.90g、トルエン50gを仕込み、反応系内を窒素置換した。窒素気流下80℃にて30分間撹拌することによりBPDAを溶解させ、その後180℃まで昇温して6時間加熱撹拌をおこなった。反応中に生成する水はトルエン、ピリジンとの共沸混合物として反応系外へ除いた。反応終了後、120℃まで冷却し、20質量%濃度のポリイミド溶液を得た。得られたポリイミド共重合体の構造は、下記の式(18)のとおりである。
実施例1と同様の装置にBPDA47.08g(0.16モル)、PMDA17.68g(0.08モル)、DETDA42.79g(0.24モル)、NMP183.23g、ピリジン3.8g、トルエン50gを仕込み、反応系内を窒素置換した。窒素気流下80℃にて30分間撹拌することによってBPDAとPMDAを溶解させ、その後180℃まで昇温して6時間加熱撹拌をおこなった。反応中に生成する水はトルエン、ピリジンとの共沸混合物として反応系外へ除いた。反応終了後、120℃まで冷却したところでNMP112.76gを添加することにより、25質量%濃度のポリイミド溶液を得た。得られたポリイミド共重合体の構造は、下記の式(19)のとおりである。
実施例1と同様の装置にDSDA46.58g(0.13モル)、ビス[4-(4-アミノフェノキシ)フェニル]スルホン(pBAPS)56.22g(0.13モル)、NMP182.22g、ピリジン2.06g、トルエン50gを仕込み、反応系内を窒素置換した。窒素気流下80℃にて30分間撹拌することによりPMDAを溶解させ、その後180℃まで昇温して6時間加熱撹拌をおこなった。反応中に生成する水はトルエン、ピリジンとの共沸混合物として反応系外へ除いた。反応終了後、120℃まで冷却したところでNMP112.13gを添加することにより、25%濃度のポリイミド溶液を得た。
実施例1と同様の装置にBPDA38.25g(0.13モル),pBAPS 56.22g(0.13モル),NMP269.37g,ピリジン2.06g,トルエン50gを仕込み、反応系内を窒素置換した。窒素気流下80℃にて30分間撹拌することによりPMDAを溶解させ、その後180℃まで昇温して6時間加熱撹拌をおこなった。反応中に生成する水はトルエン、ピリジンとの共沸混合物として反応系外へ除いた。反応終了後、120℃まで冷却したところでNMP192.40gを添加することにより、20%濃度のポリイミド溶液を得た。
実施例および比較例で得られたポリイミド共重合体をスピンコート法を用いてシリコンウエハ上に塗布し、120℃のホットプレート上で10分間仮乾燥をおこなった。仮乾燥したフィルムをシリコンウエハから剥離し、ステンレス製の枠に固定して180℃で1時間、250℃で30分間、320℃で1時間乾燥を実施した。成膜性の評価は、120℃仮乾燥時にシリコンウエハから剥離する際に単独で膜形状を維持できない場合を×、250℃乾燥終了時は単独で膜形状を維持できるが、320℃乾燥後に膜形状を維持できないほど脆性化する場合を△、320℃乾燥後においても単独で膜形状を維持できる場合を○とした。得られた結果を、表1、2に示す。
成膜性評価で作成したフィルムを用いて、ガラス転移温度の測定を行った。測定は、DSC6200(セイコーインスツル株式会社製)を用いた。尚、10℃/min.の昇温速度で500℃まで加熱し、ガラス転移温度は中間点ガラス転移温度を適用した。得られた結果を、表1、2に示す。
成膜性評価で作成したフィルムを用いて、5%熱重量減少温度の測定をおこなった。測定は、TG/DTA6200(セイコーインスツル株式会社製)を用いた。尚、昇温条件は、10℃/min.の速度で昇温して、質量が5%減少したときの温度を測定し、5%熱重量減少温度とした。得られた結果を表1、2に示す。
成膜性評価で作成したフィルムを100mm長×10mm幅の試験片に加工しクリープメータ(株式会社山電製 RE2-33005B)を用い引張弾性率、破断点応力、破断点伸度を測定した。測定は各5回行い、最大の破断点応力を示したデータを用いた。なおチャック間距離は50mm、引張り速度は5mm/sec.とした。
Claims (4)
- (A)3,3’,4,4’-ビフェニルテトラカルボン酸二無水物と、(B)ジアミンおよび/またはジイソシアネートと、が共重合されてなる、500℃未満にガラス転移点が観測されないことを特徴とする溶媒可溶型ポリイミド共重合体。
- 前記R1~R4のうち2個がエチル基であり、残り2個がメチル基と水素原子である請求項2記載の溶媒可溶型ポリイミド共重合体。
- 前記R5~R8がメチル基またはエチル基である請求項2記載の溶媒可溶型ポリイミド共重合体。
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