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公开(公告)号：FI955175A0
公开(公告)日：1995-10-30
申请号：FI955175
申请日：1995-10-30
Applicant: MITSUI TOATSU CHEMICALS
Inventor： YOSHIDA YASUNORI , MIYAMOTO MICHIHIKO , OBUCHI SHOJI , IKEDA KAN , OHTA MASAHIRO
Abstract: The invention relates to a process for preparing a polyhydroxycarboxylic acid comprising conducting the dehydration polycondensation of a hydroxycarboxylic acid or an oligomer of the same in a reaction mixture containing said hydroxycarboxylic acid or the oligomer thereof and an organic solvent substantially in the absence of water to produce a polyhydroxycarboxylic acid having a weight average molecular weight of 50,000 or more, successively mixing and reacting the reaction mixture containing said polyhydroxycarboxylic acid with at least one linking reagent selected from the group consisting of (1) polyisocyanate compounds, (2) polybasic acid anhydrides, (3) cyclic imino esters, (4) cyclic imino ethers, (5) aromatic hydroxycarboxylic acids, (6) polyamino compounds, (7) polyhydric alcohols, (8) epoxy compounds, (9) polyfunctional aziridine compounds, (10) lactames, (11) lactones, and (12) diethylene glycol bischloroformates to obtain a polyhydroxycarboxylic acid having a weight average molecular weight of 100,000 or more. The polyhydroxycarboxylic acid obtained by the process of the invention has a weight average molecular weight of 100,000 or more and satisfactory mechanical strength in the form of molded articles and is useful as a degradable polymer for substituting medical materials and general purpose resins.
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公开(公告)号：FI935791A0
公开(公告)日：1993-12-22
申请号：FI935791
申请日：1993-12-22
Applicant: MITSUI TOATSU CHEMICALS
Inventor： OHTA MASAHIRO , OBUCHI SHOJI , YOSHIDA YASUNORI
Abstract: A preparation process of polyhydroxycarboxylic acid having an inherent viscosity of 0.3 dl/g or more by dehydrating polycondensation of lactic acid containing hydroxycarboxylic acid in an organic solvent in the presence or absence of a catalyst, comprising using a hydroxycarboxylic acid raw material which comprises one or more impurities selected from the group consisting of methanol, ethanol, acetic acid, pyruvic acid, fumaric acid, methyl lactate, ethyl lactate and butyl lactate in a total amount of 0.3 % by mole or less for the amount of said hydroxycarboxylic acid raw material.
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Patent Agency Ranking
公开(公告)号：DE69209172T2
公开(公告)日：1996-10-17
申请号：DE69209172
申请日：1992-01-20
Applicant: MITSUI TOATSU CHEMICALS
Inventor： OHTA MASAHIRO , MATSUYAMA AKIO , SENOUE EIJI , KUWANO FUMIAKI , YASUI OSAMU , YOSHIDA YASUNORI , RYU AKINORI , KOBAYASHI TADASHI
IPC: C07D209/48 , C07D209/66 , C07D487/04 , C08G73/10 , C08G73/12 , C08K5/3417 , C08K9/04 , C08L79/08 , C09D179/08
Abstract: A polyimide resin composition for molding, which comprises a polyimide resin and an aromatic bisimide compound and has a melt flowability and an excellent processability in addition to the heat resistance inherent in polyamide; a carbon fiber-reinforced polyimide resin composition which comprises a polyimide resin and carbon fibers coated with an aromatic bisimide compound and has excellent mechanical strengths; and novel bisimide compounds represented by general formula (I), which are very useful as the aromatic bisimide compounds in the above resin compositions, wherein X represents a direct bond, C1 to C10 divalent hydrocarbyl, hexafluoroisopropylidene, carbonyl, thio or sulfonyl; Y1 to Y4 represent each independently hydrogen, lower alkyl, lower alkoxy, chlorine or bromine; and R represents a divalent group selected from the group consisting of monocyclic aromatic groups, fused polycyclic aromatic groups, and nonfused polycyclic aromatic groups wherein aromatic groups are linked together directly or through cross-linking member(s).
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公开(公告)号：FI955175A
公开(公告)日：1996-05-03
申请号：FI955175
申请日：1995-10-30
Applicant: MITSUI TOATSU CHEMICALS
Inventor： YOSHIDA YASUNORI , MIYAMOTO MICHIHIKO , OBUCHI SHOJI , IKEDA KAN , OHTA MASAHIRO
Abstract: The invention relates to a process for preparing a polyhydroxycarboxylic acid comprising conducting the dehydration polycondensation of a hydroxycarboxylic acid or an oligomer of the same in a reaction mixture containing said hydroxycarboxylic acid or the oligomer thereof and an organic solvent substantially in the absence of water to produce a polyhydroxycarboxylic acid having a weight average molecular weight of 50,000 or more, successively mixing and reacting the reaction mixture containing said polyhydroxycarboxylic acid with at least one linking reagent selected from the group consisting of (1) polyisocyanate compounds, (2) polybasic acid anhydrides, (3) cyclic imino esters, (4) cyclic imino ethers, (5) aromatic hydroxycarboxylic acids, (6) polyamino compounds, (7) polyhydric alcohols, (8) epoxy compounds, (9) polyfunctional aziridine compounds, (10) lactames, (11) lactones, and (12) diethylene glycol bischloroformates to obtain a polyhydroxycarboxylic acid having a weight average molecular weight of 100,000 or more. The polyhydroxycarboxylic acid obtained by the process of the invention has a weight average molecular weight of 100,000 or more and satisfactory mechanical strength in the form of molded articles and is useful as a degradable polymer for substituting medical materials and general purpose resins.
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公开(公告)号：DE69209172D1
公开(公告)日：1996-04-25
申请号：DE69209172
申请日：1992-01-20
Applicant: MITSUI TOATSU CHEMICALS
Inventor： OHTA MASAHIRO , MATSUYAMA AKIO , SENOUE EIJI , KUWANO FUMIAKI , YASUI OSAMU , YOSHIDA YASUNORI , RYU AKINORI , KOBAYASHI TADASHI
IPC: C07D209/48 , C07D209/66 , C07D487/04 , C08G73/10 , C08G73/12 , C08K5/3417 , C08K9/04 , C08L79/08 , C09D179/08
Abstract: A polyimide resin composition for molding, which comprises a polyimide resin and an aromatic bisimide compound and has a melt flowability and an excellent processability in addition to the heat resistance inherent in polyamide; a carbon fiber-reinforced polyimide resin composition which comprises a polyimide resin and carbon fibers coated with an aromatic bisimide compound and has excellent mechanical strengths; and novel bisimide compounds represented by general formula (I), which are very useful as the aromatic bisimide compounds in the above resin compositions, wherein X represents a direct bond, C1 to C10 divalent hydrocarbyl, hexafluoroisopropylidene, carbonyl, thio or sulfonyl; Y1 to Y4 represent each independently hydrogen, lower alkyl, lower alkoxy, chlorine or bromine; and R represents a divalent group selected from the group consisting of monocyclic aromatic groups, fused polycyclic aromatic groups, and nonfused polycyclic aromatic groups wherein aromatic groups are linked together directly or through cross-linking member(s).
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公开(公告)号：DE4418643A1
公开(公告)日：1994-12-01
申请号：DE4418643
申请日：1994-05-27
Applicant: MITSUI TOATSU CHEMICALS
Inventor： ICHIKAWA FUMIAKI , KOBAYASHI MINEO , OHTA MASAHIRO , YOSHIDA YASUNORI , OBUCHI SHOJI , ITOH HIROYUKI
Abstract: The invention relates to a process for the preparation of poly(hydroxy carboxylic acids) by carrying out a dehydration polycondensation of hydroxy carboxylic acids in the presence or absence of a catalyst and in the presence or absence of an organic solvent, which comprises using a vertical reactor for high-viscosity reaction mixtures in all or in some of the dehydration polycondensation steps, and carrying out the polycondensation at elevated temperature, while components of low boiling point are separated off and removed. The process allows high-molecular-weight poly(hydroxy carboxylic acids) to be prepared simply and inexpensively on a large industrial scale.
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公开(公告)号：FI935791A
公开(公告)日：1994-06-26
申请号：FI935791
申请日：1993-12-22
Applicant: MITSUI TOATSU CHEMICALS
Inventor： OHTA MASAHIRO , OBUCHI SHOJI , YOSHIDA YASUNORI
IPC: C08G63/06
Abstract: A preparation process of polyhydroxycarboxylic acid having an inherent viscosity of 0.3 dl/g or more by dehydrating polycondensation of lactic acid containing hydroxycarboxylic acid in an organic solvent in the presence or absence of a catalyst, comprising using a hydroxycarboxylic acid raw material which comprises one or more impurities selected from the group consisting of methanol, ethanol, acetic acid, pyruvic acid, fumaric acid, methyl lactate, ethyl lactate and butyl lactate in a total amount of 0.3 % by mole or less for the amount of said hydroxycarboxylic acid raw material.
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