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91. 发明专利

JPH03255067A FLUORINE-CONTAINING BISMALEIMIDE AND ITS PRODUCTION 失效
公开(公告)号：JPH03255067A
公开(公告)日：1991-11-13
申请号：JP5457490
申请日：1990-03-05
申请人： NITTO DENKO CORP
发明人： NISHIKIMI TADASHI , SHIRAI MITSUYOSHI , YAMAMOTO KAZUNARI , YAMAMOTO MICHIHARU , KIHARA YASUO , HAYASHI SHUNICHI
IPC分类号： C07D207/452 , C08G73/12
摘要： NEW MATERIAL:2,2-Bis(3-maleimido-4-methylphenyl)hexafluoropropane expressed by formula I. USE:Useful as an intermediate for polymers. Cured products obtained by reacting the compound expressed by formula l with an amine-terminated oligomer have characteristics such as a low dielectric constant and dielectric loss further with flexibility and are excellent also in heat resistance. PREPARATION:A fluorine-containing diamine expressed by formula II is made to react with maleic anhydride to initially provide a bismaleamic acid expressed by formula III, which is then cyclodehydrated in the second stage to form imide rings and afford the compound expressed by formula I. The dehydration is carried out in the coexistence of an acid catalyst such as p-toluenesulfonic acid in an amount of 0.01-0.5mol based on 1mol amic acid group by heating at 50-200 deg.C.

92. 发明专利

JPH03221524A FLUORINE-CONTAINING POLYAMIC ACID-BASED RESIN AND FLUORINE-CONTAINING POLYIMIDE 失效
公开(公告)号：JPH03221524A
公开(公告)日：1991-09-30
申请号：JP1649190
申请日：1990-01-26
申请人： NITTO DENKO CORP
发明人： YAMAMOTO MICHIHARU , NISHIKIMI TADASHI
IPC分类号： C08G73/10
摘要： PURPOSE:To obtain a fluorine-containing polyamic acid-based resin, having specific recurring units, capable of providing fluorine-containing polyimide-based resins with specified recurring units by curing, having low hygroscopicity and dielectric constant, excellent in heat resistance and suitable as insulating films. CONSTITUTION:A fluorine-containing polyamic acid-based resin, obtained by dissolving a fluorine-containing bifunctional diamine, e.g. 2,2-bis[4-(4- aminophenoxy)phenyl]hexafluoropropane and a tetracarboxylic acid (derivative) such as a fluorine-containing pyromellitic acid (derivative) in a solvent such as N-methylpyrrolidone and carrying out reaction at ambient temperature overnight, having recurring units expressed by formula I (R1 and R2 are H or alkyl; R3 is bifunctional group having fluorine atom and 1-4 benzene rings; n is 2-10), capable of providing fluorine-containing polyimide resins expressed by formula II by curing and having preferably 0.3-2.0dl/g intrinsic viscosity.

93. 发明专利

JPH03162450A THERMOSETTING RESIN COMPOSITION 失效
公开(公告)号：JPH03162450A
公开(公告)日：1991-07-12
申请号：JP30360089
申请日：1989-11-21
申请人： NITTO DENKO CORP
发明人： KIHARA YASUO , YAMAMOTO MICHIHARU , SHIRAI MITSUYOSHI
IPC分类号： C08K5/3415 , C08L79/00 , H05K1/03
摘要： PURPOSE:To obtain a thermosetting resin composition, excellent in heat resistance, processability and electrical characteristics and suitable as printing circuit boards, molded products, etc., by blending a specific polyazomethine with specified bismaleimide. CONSTITUTION:A thermosetting resin composition obtained by blending (A) a polyazomethine having recurring units expressed by formula I (Ar1 and Ar2 are bifunctional aromatic group) with (B) an unsaturated bismaleimide compound expressed by formula II (Ar3 is bifunctional aromatic group; D and D' are bifunctional organic group having unsaturated bond) in an amount of 0.05-5mol, preferably 0.1-2mol based on 1mol recurring units expressed by formula I.

94. 发明专利

JPH02208324A LOW-PERMITTIVITY SHEET, AND LAMINATE AND MULTILAYER CIRCUIT BOARD PREPARED BY USING SAME SHEET 失效
公开(公告)号：JPH02208324A
公开(公告)日：1990-08-17
申请号：JP2949389
申请日：1989-02-08
申请人： NITTO DENKO CORP
发明人： HINO ATSUSHI , UEDA ZENICHI , MOTOGAMI MITSURU , ERIGUCHI FUYUKI , KIHARA YASUO , YAMAMOTO MICHIHARU , SHIRAI MITSUYOSHI
IPC分类号： C08J5/18 , C08G73/10 , H05K1/03 , H05K3/46
摘要： PURPOSE:To obtain the title sheet improved in low permittivity properties, processability and dimensional stability by impregnating a porous substrate with a fluoropolyimide having specified repeating units. CONSTITUTION:A polyamide acid of an intrinsic viscosity of 0.2-0.7 (in N- methyl-2-pyrrolidone in a 0.5dl/g concentration at 30 deg.C) obtained by reacting a fluorinated tetracarboxylic acid (derivative) [e.g. bis(3,4-dicarboxyphenyl) difluoromethane] with a fluorinated diamine [e.g. 2,2,-bis(4-amino-2-alkylphneyl) hexafluoropropane] at 0-90 deg.C for 1-24hr in an organic polar solvent (e.g. N- methyl-2-pyrrolidone) is imidated to obtain a fluoropolyimide having repeating units of the formula (wherein Ar1 is a tetravalent aliphatic or aromatic group; Ar2 is a bivalent aromatic group, and at least one of Ar1 and Ar2 contains a perfluoroalkylene group). A porous fluororesin substrate of a pore diameter of 0.1-5mum, a void volume of 50-85% and a thickness of 5-500mum is impregnated with this polyimide to obtain a low-permittivity sheet of a permittivity

95. 发明专利

JPS6442444A METHOD FOR SEPARATING AND RECOVERING FLON 失效
公开(公告)号：JPS6442444A
公开(公告)日：1989-02-14
申请号：JP20052887
申请日：1987-08-10
申请人： NITTO DENKO CORP
发明人： YAMAMOTO MICHIHARU , MATSUMOTO KENJI , IWAMA AKIO
IPC分类号： B01D53/22 , C07C17/00 , C07C17/38 , C07C17/389 , C07C19/08 , C07C67/00
摘要： PURPOSE:To selectively and efficiently separate and recover flon from a gaseous mixture containing the flon, by using a permoselective composite membrane having a porous support membrane and an active thin film, formed on the above-mentioned support film and prepared by crosslinking a crosslinkable silicone polymer. CONSTITUTION:A gaseous mixture containing preferably 0.005-50vol.% flon is brought into contact with a permoselective composite membrane having an isotropic structure constituted of preferably a surface dense layer and a porous layer integrally supporting the above-mentioned dense layer, especially the porous support membrane, consisting of a polyimide or polysulfone and having 5,000-100,000 fractionation molecular weight and an active thin film, formed on the afore-mentioned support membrane, preferably on the above- mentioned dense layer and prepared by crosslinking a crosslinkable silicone polymer having preferably 10,000-300,000 average molecular weight to selectively permeate the flon. Thereby the flon useful as a refrigerant, etc., is efficiently recovered from the gaseous mixture containing the flon in an especially high concentration by a method enabling continuous treatment without requiring cyclic operation or thermal energy.

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