JP5399754B2 - ポリイミド樹脂前駆体及びその硬化物 - Google Patents
ポリイミド樹脂前駆体及びその硬化物 Download PDFInfo
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- JP5399754B2 JP5399754B2 JP2009085529A JP2009085529A JP5399754B2 JP 5399754 B2 JP5399754 B2 JP 5399754B2 JP 2009085529 A JP2009085529 A JP 2009085529A JP 2009085529 A JP2009085529 A JP 2009085529A JP 5399754 B2 JP5399754 B2 JP 5399754B2
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- acid
- curable resin
- urethane prepolymer
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- 229920001721 polyimide Polymers 0.000 title claims description 41
- 239000009719 polyimide resin Substances 0.000 title description 21
- 239000002243 precursor Substances 0.000 title description 10
- -1 aromatic tetracarboxylic acid Chemical class 0.000 claims description 44
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims description 38
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims description 38
- 239000011342 resin composition Substances 0.000 claims description 26
- 239000002981 blocking agent Substances 0.000 claims description 22
- 239000002904 solvent Substances 0.000 claims description 21
- 239000004642 Polyimide Substances 0.000 claims description 18
- 150000008065 acid anhydrides Chemical class 0.000 claims description 18
- 150000002009 diols Chemical class 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 125000005442 diisocyanate group Chemical group 0.000 claims description 11
- 125000005843 halogen group Chemical group 0.000 claims description 11
- 125000002947 alkylene group Chemical group 0.000 claims description 10
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 10
- 125000003545 alkoxy group Chemical group 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 8
- 125000002252 acyl group Chemical group 0.000 claims description 6
- 125000004414 alkyl thio group Chemical group 0.000 claims description 6
- 125000003277 amino group Chemical group 0.000 claims description 6
- GTDPSWPPOUPBNX-UHFFFAOYSA-N ac1mqpva Chemical compound CC12C(=O)OC(=O)C1(C)C1(C)C2(C)C(=O)OC1=O GTDPSWPPOUPBNX-UHFFFAOYSA-N 0.000 claims description 5
- 125000002102 aryl alkyloxo group Chemical group 0.000 claims description 5
- 125000005110 aryl thio group Chemical group 0.000 claims description 5
- 125000004104 aryloxy group Chemical group 0.000 claims description 5
- 125000000000 cycloalkoxy group Chemical group 0.000 claims description 5
- 125000005366 cycloalkylthio group Chemical group 0.000 claims description 5
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 5
- 125000004018 acid anhydride group Chemical group 0.000 claims description 4
- 125000004659 aryl alkyl thio group Chemical group 0.000 claims description 4
- 239000007795 chemical reaction product Substances 0.000 claims description 4
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 2
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 claims 1
- NIHNNTQXNPWCJQ-UHFFFAOYSA-N fluorene Chemical group C1=CC=C2CC3=CC=CC=C3C2=C1 NIHNNTQXNPWCJQ-UHFFFAOYSA-N 0.000 description 37
- 229920005862 polyol Polymers 0.000 description 33
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- 150000003077 polyols Chemical class 0.000 description 28
- 239000000243 solution Substances 0.000 description 23
- 125000003118 aryl group Chemical group 0.000 description 20
- 229920005575 poly(amic acid) Polymers 0.000 description 20
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- 238000010438 heat treatment Methods 0.000 description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 12
- 239000010408 film Substances 0.000 description 11
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- 239000000203 mixture Substances 0.000 description 10
- 125000003983 fluorenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3CC12)* 0.000 description 9
- 238000006467 substitution reaction Methods 0.000 description 9
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical class C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 8
- 238000000465 moulding Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- VLDPXPPHXDGHEW-UHFFFAOYSA-N 1-chloro-2-dichlorophosphoryloxybenzene Chemical compound ClC1=CC=CC=C1OP(Cl)(Cl)=O VLDPXPPHXDGHEW-UHFFFAOYSA-N 0.000 description 7
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 7
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 7
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- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 6
- 239000004721 Polyphenylene oxide Substances 0.000 description 6
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 6
- 125000002723 alicyclic group Chemical group 0.000 description 6
- 125000001931 aliphatic group Chemical group 0.000 description 6
- 125000000217 alkyl group Chemical group 0.000 description 6
- 125000001624 naphthyl group Chemical group 0.000 description 6
- 229920000570 polyether Polymers 0.000 description 6
- FKTHNVSLHLHISI-UHFFFAOYSA-N 1,2-bis(isocyanatomethyl)benzene Chemical class O=C=NCC1=CC=CC=C1CN=C=O FKTHNVSLHLHISI-UHFFFAOYSA-N 0.000 description 5
- VPWNQTHUCYMVMZ-UHFFFAOYSA-N 4,4'-sulfonyldiphenol Chemical class C1=CC(O)=CC=C1S(=O)(=O)C1=CC=C(O)C=C1 VPWNQTHUCYMVMZ-UHFFFAOYSA-N 0.000 description 5
- 239000004962 Polyamide-imide Substances 0.000 description 5
- 125000005036 alkoxyphenyl group Chemical group 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 230000009477 glass transition Effects 0.000 description 5
- 229920002312 polyamide-imide Polymers 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
- 150000004945 aromatic hydrocarbons Chemical group 0.000 description 4
- 125000002619 bicyclic group Chemical group 0.000 description 4
- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 description 4
- 238000001723 curing Methods 0.000 description 4
- 150000004985 diamines Chemical class 0.000 description 4
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 4
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 4
- 125000006158 tetracarboxylic acid group Chemical group 0.000 description 4
- ARCGXLSVLAOJQL-UHFFFAOYSA-N trimellitic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C(C(O)=O)=C1 ARCGXLSVLAOJQL-UHFFFAOYSA-N 0.000 description 4
- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 description 3
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- NQXNYVAALXGLQT-UHFFFAOYSA-N 2-[4-[9-[4-(2-hydroxyethoxy)phenyl]fluoren-9-yl]phenoxy]ethanol Chemical compound C1=CC(OCCO)=CC=C1C1(C=2C=CC(OCCO)=CC=2)C2=CC=CC=C2C2=CC=CC=C21 NQXNYVAALXGLQT-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical group C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 229930185605 Bisphenol Natural products 0.000 description 3
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical group [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 125000001309 chloro group Chemical group Cl* 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 125000001153 fluoro group Chemical group F* 0.000 description 3
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 3
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 3
- 239000012948 isocyanate Substances 0.000 description 3
- 150000002513 isocyanates Chemical class 0.000 description 3
- 150000002596 lactones Chemical class 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- WHIVNJATOVLWBW-SNAWJCMRSA-N methylethyl ketone oxime Chemical compound CC\C(C)=N\O WHIVNJATOVLWBW-SNAWJCMRSA-N 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 229920005906 polyester polyol Polymers 0.000 description 3
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 3
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- 238000007789 sealing Methods 0.000 description 3
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 3
- 230000004580 weight loss Effects 0.000 description 3
- 125000004178 (C1-C4) alkyl group Chemical group 0.000 description 2
- 125000004169 (C1-C6) alkyl group Chemical group 0.000 description 2
- 125000006713 (C5-C10) cycloalkyl group Chemical group 0.000 description 2
- QPFMBZIOSGYJDE-UHFFFAOYSA-N 1,1,2,2-tetrachloroethane Chemical compound ClC(Cl)C(Cl)Cl QPFMBZIOSGYJDE-UHFFFAOYSA-N 0.000 description 2
- SBJCUZQNHOLYMD-UHFFFAOYSA-N 1,5-Naphthalene diisocyanate Chemical compound C1=CC=C2C(N=C=O)=CC=CC2=C1N=C=O SBJCUZQNHOLYMD-UHFFFAOYSA-N 0.000 description 2
- HXVNBWAKAOHACI-UHFFFAOYSA-N 2,4-dimethyl-3-pentanone Chemical compound CC(C)C(=O)C(C)C HXVNBWAKAOHACI-UHFFFAOYSA-N 0.000 description 2
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
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- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical group [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
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- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 2
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- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 description 2
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- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 2
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- 150000003512 tertiary amines Chemical class 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
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- KMOUUZVZFBCRAM-OLQVQODUSA-N (3as,7ar)-3a,4,7,7a-tetrahydro-2-benzofuran-1,3-dione Chemical compound C1C=CC[C@@H]2C(=O)OC(=O)[C@@H]21 KMOUUZVZFBCRAM-OLQVQODUSA-N 0.000 description 1
- 125000003837 (C1-C20) alkyl group Chemical group 0.000 description 1
- 125000006681 (C2-C10) alkylene group Chemical group 0.000 description 1
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Description
本発明の硬化性樹脂組成物(ポリイミド前駆体)は、末端イソシアネート基がブロック剤で封止されたウレタンプレポリマー(A)及び酸無水物(B)を含む。
ウレタンプレポリマー(A)は、末端イソシアネート基を有するウレタンプレポリマーをブロック剤で封止することにより得られる。本発明では、ウレタンプレポリマーの末端イソシアネート基をブロック剤で封止することにより、樹脂組成物の保存安定性を向上できる。
ポリイソシアネート類としては、分子中に2個以上のイソシアネート基を有する限り特に制限されず、例えば、脂肪族ポリイソシアネート、脂環族ポリイソシアネート、芳香脂肪族ポリイソシアネート、芳香族ポリイソシアネート、ポリイソシアネートの誘導体などが挙げられる。
前記ポリオール類としては、例えば、脂肪族ジオール[アルカンジオール(エチレングリコール、プロピレングリコール、トリメチレングリコール、1,3−ブチレングリコール、1,4−ブチレングリコール、1,5−ペンタンジオール、ネオペンチルグリコール、1,6−ヘキサンジオールなどのC2−22アルカンジオール)など]、脂環族ジオール(1,4−シクロヘキサンジオール、1,4−シクロヘキサンジメタノールなどのシクロアルカンジオール類、水添ビスフェノールAなどの水添ビスフェノール類、又はこれらのC2−4アルキレンオキサイド付加体など)、芳香族ジオール(キシリレングリコールなどの芳香脂肪族ジオール、ビスフェノールA、ビスフェノールS、ビスフェノールFなどのビスフェノール類、又はこれらのC2−4アルキレンオキサイド付加体、フルオレン骨格を含有するジオール類など)などのジオール類、トリオール類(グリセリン、トリメチロールエタン、トリメチロールプロパン、1,2,6−ヘキサントリオール、トリエタノールアミンなど)、テトラオール類(ペンタエリスリトール、ソルビタン又はこれらの誘導体など)など]、ポリマーポリオール類などが挙げられる。
フルオレン骨格を有するジオールは、下記式(1)で表されるジオールであってもよい。
ウレタンプレポリマー(A)は、前記ポリイソシアネート類と前記ポリオール類とを反応させて、末端イソシアネート基を有するプレポリマーを生成した後、ブロック剤でイソシアネート基を封止することにより製造できる。
得られたウレタンプレポリマーは、ブロック剤との反応に先立って分離してもよいが、通常、前記ウレタンプレポリマーを含む反応系に、そのまま、ブロック剤を混合して反応を行う。
酸無水物(B)としては、複数の酸無水物基を有していればよく、テトラカルボン酸二無水物、特に、ポリイミド樹脂で使用される慣用の酸無水物である芳香族又は脂環族テトラカルボン酸二無水物が利用できる。芳香族又は脂環族テトラカルボン酸二無水物には、単環式又は縮合環式芳香族テトラカルボン酸二無水物(例えば、ピロメリット酸二無水物やナフタレンテトラカルボン酸二無水物など)、及び下記式(2)で表される芳香族テトラカルボン酸二無水物が含まれる。
本発明の硬化性樹脂組成物は、前記ウレタンプレポリマー(A)及び酸無水物(B)を含み、ポリイミド樹脂の前駆体として用いられる。本発明の樹脂組成物は、プレポリマー(A)の種類や分子量に応じて、(半)固形状物又は液状物として調製でき、ウレタンプレポリマー(A)がフルオレン骨格を有する場合には、通常、固形状物として調製できる。さらに、フルオレン骨格を有する固形状の混合物(コンパウンド)は、ウレタンプレポリマー(A)の末端イソシアネート基がブロック剤で封止されているため、保存安定性及び取り扱い性に優れている。すなわち、本発明の樹脂組成物は安定であるため、成形材料としての取り扱い性にも優れており、従来のように、溶媒を用いて溶液にすることなく、そのまま成形に供することができる。さらに、後述するように、成形性及び加工性に優れており、低温かつ短時間で簡便に樹脂組成物をイミド化できる。
本発明の硬化性樹脂組成物は、溶媒を用いることなく、そのまま加熱又は熱硬化してイミド化することによりポリイミド樹脂(ポリイミド成形体)とすることができる。成形方法としては、例えば、液状樹脂組成物の場合には、射出成形、圧縮成形、トランスファー成形、注型成形などを利用でき、(半)固体状樹脂組成物の場合には、射出成形、圧縮成形(加圧成形)などを利用できる。特に、固体状樹脂組成物の場合、粉体状のコンパウンドを熱プレス(粉末加圧成形)するだけで、厚肉の成形体を簡便に得ることができる。
9,9−ビス[4−(2−ヒドロキシエトキシ)フェニル]フルオレン(BPEF、大阪ガスケミカル(株)製)10.02gに、乾燥したN−メチル−2−ピロリドン(NMP)84.22gを添加し、さらに1,5−ナフタレンジイソシアネート(NDI、三井化学ポリウレタン(株)製)9.64gを添加して室温で15分間撹拌し、添加したNDIを完全に溶解させた。この溶液に、1重量%に希釈したジ−n−ブチルスズジラウレート(DTD、ナカライテスク(株)製)のNMP溶液を1.02g添加し、さらに1時間撹拌して、末端にイソシアネート基を有するウレタンプレポリマーを得た。このプレポリマーのイソシアネート基含有割合(NCO%)を測定したところ、7.80%であった。また、イソシアネート基が存在することを反応溶液のIR分析で確認した。続いて、反応溶液に2−ブタノンオキシム3.77gを添加して、室温で3時間撹拌し、末端イソシアネート基をブロックした。イソシアネート基の消失を反応溶液のIR分析で確認した。反応溶液をメタノール500mlに滴下し、析出した白色の固体をろ過、乾燥し、BPEF−NDIのブロック化ウレタンプレポリマー11.79gを収率50%で得た。
ジフェニルメタンジイソシアネート(MDI、日本ポリウレタン工業(株)製)11.70gに、乾燥したジオキサン40.01gと、1重量%に希釈したDTDのジオキサン溶液を1.02gとを添加した。乾燥したジオキサン49.32gにBPEF10.04gを溶解させて、前記MDIを含む溶液に添加し、室温で1.5時間撹拌撹拌して、末端にイソシアネート基を有するウレタンプレポリマーを得た。このプレポリマーのイソシアネート基含有割合(NCO%)を測定したところ、8.00%であった。また、イソシアネート基が存在することを反応溶液のIR分析で確認した。続いて、反応溶液に2−ブタノンオキシム3.80gを添加して、室温で2時間撹拌し、末端イソシアネート基をブロックした。イソシアネート基の消失を反応溶液のIR分析で確認した。反応溶液をメタノール500mlに滴下し、析出した白色の固体をろ過、乾燥し、BPEF−MDIのブロック化ウレタンポリマー14.35gを収率57%で得た。
実施例1で得られたBPEF−NDIのブロック化ウレタンポリマー1gに対してピロメリット酸二無水物(PMDA)0.087g(ウレタンプレポリマーに対して当量比で0.5)、0.17g(同じく当量比で1.0)、0.26g(同じく当量比で1.5)の割合で配合した混合物(ポリイミド樹脂の前駆体)を作製した。この混合物を200℃に加熱した加圧成形機で30MPaの圧力で1時間プレスして、厚み0.3mmのポリイミド樹脂(硬化物)のフィルムを得た。当量比1.0のフィルムのガラス転移温度は309℃、10%重量減少温度288℃であった。
実施例2で得られたBPEF−MDIのブロック化ウレタンポリマー1gに対してピロメリット酸二無水物(PMDA)0.089g(ウレタンプレポリマーに対して当量比で0.5)、0.18g(同じく当量比で1.0)、0.27g(同じく当量比で1.5)の割合で配合した混合物(ポリイミド樹脂の前駆体)を作製した。この混合物を200℃に加熱した加圧成形機で30MPaの圧力で1時間プレスして、厚み0.3mmのポリイミド樹脂(硬化物)のフィルムを得た。当量比1.0のフィルムのガラス転移温度は323℃、10%重量減少温度318℃であった。
三口セパラブルフラスコに、9,9−ビスアニリンフルオレン(BAF、JFEケミカル(株)製)8.71gを添加し、さらに乾燥したNMP75.04gを添加した。この溶液を窒素でバブリングして、0℃で撹拌しながら、この溶液にPMDA5.74gを添加し、メカニカルスターラーで2時間撹拌した後、室温で17時間撹拌した。反応溶液を蒸留水1.5リットルに滴下し、得られた固体をメタノールで洗浄した後、乾燥し、NMPを含むポリアミド酸22.22gを得た。ポリアミド酸の重量平均分子量は37900、数平均分子量は6390であった。
BAFの代わりに4,4′−メチレンジアニリン(東京化成工業(株)製)4.97gを用いた以外は比較例1と同様にして、NMPを含むポリアミド酸17.27gを得た。ポリアミド酸の重量平均分子量は44400、数平均分子量は7890であった。
比較例1で得られたポリアミド酸を23重量%含むジメチルホルムアミド溶液をガラス板上にキャストし、加熱により乾燥及び熱イミド化を行った。加熱処理は、120℃で30分間処理した後、150℃、200℃、250℃、300℃、350℃で各10分間処理して段階的に行い、ポリイミドフィルムを得た。フィルムのガラス転移温度は349℃、3%重量減少温度は500℃であった。
比較例2で得られたポリアミド酸を23重量%含むジメチルホルムアミド溶液をガラス板上にキャストし、加熱により乾燥及び熱イミド化を行った。加熱処理は、120℃で30分間処理した後、150℃、200℃、250℃、300℃、350℃で各10分間処理して段階的に行い、ポリイミドフィルムを得た。フィルムのガラス転移温度は検出されなかったが、3%重量減少温度は500℃であった。
Claims (6)
- 末端イソシアネート基がブロック剤で封止されたウレタンプレポリマー(A)及び酸無水物(B)を含む硬化性樹脂組成物であって、
前記ウレタンプレポリマー(A)が、下記式(1)で表されるジオールとジイソシアネートとの反応生成物をケトオキシム類で末端封止したプレポリマーであり、酸無水物(B)が芳香族テトラカルボン酸二無水物である硬化性樹脂組成物。
- ジイソシアネートが芳香族ジイソシアネートである請求項1記載の硬化性樹脂組成物。
- ウレタンプレポリマー(A)の末端封止イソシアネート基と、酸無水物(B)の酸無水物基との当量比が、前者/後者=1/0.5〜1/3である請求項1又は2記載の硬化性樹脂組成物。
- 請求項1〜3のいずれかに記載の硬化性樹脂組成物を加熱するポリイミド成形体の製造方法。
- 溶媒を用いることなく、180〜300℃で加熱する請求項4記載の製造方法。
- 請求項4又は5記載の方法により得られるポリイミド成形体。
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