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公开(公告)号：JPH072988A
公开(公告)日：1995-01-06
申请号：JP14736393
申请日：1993-06-18
Applicant: MITSUI TOATSU CHEMICALS
Inventor： YASUI OSAMU , OBUCHI SEIJI , OTA MASAHIRO
IPC: C08G63/06 , C08G63/78 , C08L101/16
Abstract: PURPOSE:To industrially and inexpensively obtain a high-mol. weight poly(hydroxy carboxylic acid) in a short time through direct polycondensation with dehydration. CONSTITUTION:The production process comprises heating a hydroxy carboxylic acid or an oligomer thereof in an organic solvent under reflux in the presence of a catalyst to remove the formed water and low-boiling compounds from the reaction system, and then conducting polycondensation with dehydration while refluxing the solvent and simultaneously removing the formed water from the system, the solvent being an ester.
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公开(公告)号：JPH06306149A
公开(公告)日：1994-11-01
申请号：JP9568193
申请日：1993-04-22
Applicant: MITSUI TOATSU CHEMICALS
Inventor： OTA MASAHIRO , YOSHIDA IKUNORI , OBUCHI SEIJI , ITO HIROYUKI
Abstract: PURPOSE:To produce a high-molecular polyhydroxycarboxylic acid industrially in a short time at a low cost from a hydroxycarboxylic acid or its oligomer directly by polycondensation by dehydration. CONSTITUTION:A hydroxycarboxylic acid is polycondensed by dehydration in the presence or absence of a catalyst and/or a solvent under the condition that a thin-film evaporation apparatus is used to separate and remove low- boiling components in the whole or a part of the polycondensation process.
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公开(公告)号：JPH06107781A
公开(公告)日：1994-04-19
申请号：JP25964292
申请日：1992-09-29
Applicant: MITSUI TOATSU CHEMICALS
Inventor： GOTO KENICHI , KIYOMIYA TATSUYA , MORI YUKIKO , KUROKI TAKASHI , FUKUIRI YASUSHI , OBUCHI SEIJI , OTA MASAHIRO
Abstract: PURPOSE:To obtain a polycarbonate having controlled molecular weight and excellent color tone and transparency and useful for molded article, etc., by polymerizing an alkaline aqueous solution of a dihydric phenol, etc., and a halogenated carbonyl compound under specific condition to suppress the hydrolysis reaction of phosgene. CONSTITUTION:The objective polycarbonate is produced by continuously supplying an alkaline aqueous solution of a dihydric phenol such as bisphenol A and a molecular weight modifier such as phenol together with a halogenated carbonyl compound such as phosgene (the amount is preferably 1.00-1.10 equivalent based on the dihydric phenol) to an organic solvent (e.g. dichloromethane) at pH 10.0-11.0 at a definite supplying ratio and polymerizing in the presence of a polymerization catalyst such as trimethylamine.
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公开(公告)号：JPH06107629A
公开(公告)日：1994-04-19
申请号：JP25800292
申请日：1992-09-28
Applicant: MITSUI TOATSU CHEMICALS
Inventor： YOSHIDA IKUNORI , OBUCHI SEIJI , OTA MASAHIRO
IPC: C07D207/452 , B01D9/02
Abstract: PURPOSE:To obtain high purity bismaleimides usable as an IC sealing agent by dissolving bismaleimides in an aprotic organic porous solvent, charging the solution into water or a specific organic solvent to crystallize bismaleimides. CONSTITUTION:Bismaleimides expressed by the formula [X is direct bond, 1-10C divalent hydrocarbon group, hexafluorinated isopropylidene, carbonyl, thio or sulfonyl; N atom occupy p-, o- or m-position to X; Y1 to Y4 are H, lower alkyl, lower alkoxy, Cl or Br) obtained by azeotropic dehydration in the presence of an acid catalyst or a reaction mixture containing the bismaleimides are dissolved in aprotic organic polar solvent such as N,N- dimethylformamide or N-methylpyrrolidone and the solution is charged into water or an organic solvent (e.g. methanol or ethanol) being a poor solvent of bismaleimides and capable of dissolving an acid of catalyst to crystallize bismaleimides.
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公开(公告)号：JPH05247227A
公开(公告)日：1993-09-24
申请号：JP5060592
申请日：1992-03-09
Applicant: MITSUI TOATSU CHEMICALS
Inventor： JINNO YOSHITSUGU , ITO HIROYUKI , OGAMI KUNINOBU , ISHIDA TOMONORI , OTA MASAHIRO
Abstract: PURPOSE:To produce polyimide particles good in handleability in filtration or solvent removal. CONSTITUTION:An aromatic diamine is polycondensed with a tetracarboxylic acid dianhydride in an organic solvent using a suitable agitating element 6 to precipitate polyimide particles. The element 6 comprises a plate member 1 for sweeping the tank bottom and, provided thereon, rod or plate members 2 and 3 extending almost perpendicularly or horizontally.
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Patent Agency Ranking
公开(公告)号：JPH05170905A
公开(公告)日：1993-07-09
申请号：JP19809691
申请日：1991-08-07
Applicant: MITSUI TOATSU CHEMICALS
Inventor： TAMAI MASAJI , OTA MASAHIRO , YAMAGUCHI TERUHIRO
IPC: C08G73/10
Abstract: PURPOSE:To obtain a polyimide having excellent heat resistance, moldability and processability by reacting a diaminodiphenyl ether with a 3,3'-4,4'- biphenyltetracarboxylic acid dianhydride in the presence of phthalic anhydride. CONSTITUTION:(A) A diamine component consisting essentially of a diaminodiphenyl ether of formula I is reacted with (B) a 3,3'-4,4'- biphenyltetracarboxylic acid dianhydride of formula II in the presence of (C) 0.001-1mol, preferably 0.01-0.5mol based on 1mol diamine compound of formula I of phthalic anhydride preferably in an organic solvent (e.g. N,N- dimethylformamide) at
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公开(公告)号：JPH05163352A
公开(公告)日：1993-06-29
申请号：JP32868691
申请日：1991-12-12
Applicant: MITSUI TOATSU CHEMICALS
Inventor： YOSHIDA IKUNORI , OTA MASAHIRO
Abstract: PURPOSE:To obtain the title compound excellent in molding stability, processability, etc., by reacting a dihalogenodiphenyl sulfone with a dihydric phenol compound in the presence of a specified phenol compound under specified conditions. CONSTITUTION:The title compound is produced by the reaction of a dihalogenodiphenyl sulfone (e.g. 4,4'-dichlorodiphenyl sulfone) with a dihydric bisphenol compound (e.g. 4,4'-dichlorodiphenyl sulfone) in the presence of an anhydrous alkali (hydrogen) carbonate (e.g. K2CO3) in an organic polar solvent (e.g. diphenyl sulfone), which reaction is conducted in the presence of a monophenol compound of the formula, wherein R is H, lower alkyl, alkoxyl, arylalkyl, cycloalkyl or an aromatic group; and n is 1-3.
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公开(公告)号：JPH05117225A
公开(公告)日：1993-05-14
申请号：JP27955691
申请日：1991-10-25
Applicant: MITSUI TOATSU CHEMICALS
Inventor： KOBAYASHI TADASHI , SASAGAWA KATSUYOSHI , OBUCHI SEIJI , FUKUIRI YASUSHI , OTA MASAHIRO
IPC: B01J23/745 , B01J23/74 , B01J27/049 , C07B61/00 , C07C319/02 , C07C319/04 , C07C321/26 , C07C323/09 , C07C323/20 , C07C323/21
Abstract: PURPOSE:To industrially obtain the title high-purity compound at a low cost by charging a polar solvent with a halogen-substituted benzene compound, sulfur, iron powder or an iron salt followed by successive addition of a hydrosulfide to carry out reaction. CONSTITUTION:A polar solvent such as N,N-dimethylformamide is charged with (A) a halogen-substituted benzene compound of formula I (X is Cl or Br; R1 to R4 are such that when X is Br, they are each H, Cl, Br, alkyl, alkenyl, alkoxy, aryl, etc., and when X is Cl, they are each H, Cl, alkyl, alkenyl, alkoxy, aryl, etc.) (e.g. pentachlorobenzene), (B) sulfur, and (C) iron powder or an iron salt, followed by successive addition of a hydrosulfide like sodium hydrosulfide pref. at 60-140 deg.C for >= one hour to carry out reaction, thus obtaining the objective orthobenzenethiol compound of formula II (e.g. 1,2,4- trichlorobenzenedithiol). This method can yield the objective dithiol compound useful as an intermediate for synthesizing near-infrared light absorbers, with no need for any purification processes such as recrystallization or distillation.
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公开(公告)号：JPH04320449A
公开(公告)日：1992-11-11
申请号：JP8650791
申请日：1991-04-18
Applicant: MITSUI TOATSU CHEMICALS
Inventor： OTA MASAHIRO , MATSUYAMA AKIO , SEGAMI EIJI , KUWANO FUMIAKI , YASUI OSAMU , KOBAYASHI TADASHI
Abstract: PURPOSE:To obtain the title composition improved in heat resistance, chemical resistance, mechanical strengths, etc., and excellent in transparency and impact resistance inherent in polycarbonate resin by mixing an aromatic polycarbonate resin with a specified polyether imide resin. CONSTITUTION:The title composition improved in mechanical strengths and heat resistance is obtained by mixing 100 pts.wt. aromatic polycarbonate resin [e.g. a resin comprising repeating units of formula I (wherein Y is a direct bond, a 1-10 C bivalent hydrocarbon group, hexafluoroisopropylidene, carbonyl, sulfonyl, ether or thio; and R1 to R4 are each H, lower alkyl, lower alkoxy, Cl or Br)] is mixed with above 1 to below 100 pts.wt. polyetherimide having as a basic skeleton repeating units of formula II (wherein X is a direct bond, a 1-10 C bivalent linear hydrocarbon group, hexafluoroisopropylidene, carbonyl, sulfonyl or thio, and the nitrogen atom of the imide ring is meta or para to the ether bond).
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公开(公告)号：JPH04103630A
公开(公告)日：1992-04-06
申请号：JP22105690
申请日：1990-08-24
Applicant: MITSUI TOATSU CHEMICALS
Inventor： KATAOKA TOSHIYUKI , OTA MASAHIRO , YAMAGUCHI TERUHIRO
IPC: C08G69/32
Abstract: PURPOSE:To obtain a highly heat-resistant and melt moldable new aromatic polyamide by polycondensing 4,4'-bis(3-aminophenoxy)-3,3',5,5'-tetramethylbiphenyl with aromatic dicarboxylic acids in an organic solvent. CONSTITUTION:A compound expressed by formula I is polycondensed with one or more of aromatic dicarboxylic acids, aromatic dicarboxylic acid dihalogenides and/or aromatic dicarboxylic acid derivatives in an organic solvent such as N,N-dimethylformamide at
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