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    PRODUCTION OF 1,3-2,4-DIBENZYLIDENE SORBITOL
    1.
    发明专利
    PRODUCTION OF 1,3-2,4-DIBENZYLIDENE SORBITOL 失效

    公开(公告)号：JPH0912579A

    公开(公告)日：1997-01-14

    申请号：JP15884995

    申请日：1995-06-26

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： FUKUIRI YASUSHI ,  OBUCHI SEIJI ,  OTA MASAHIRO

    IPC: C07D493/04

    Abstract: PURPOSE: To produce 1,3-2,4-dibenzylidene sorbitol which is useful as a transparency improver for a resin or a gelling agent for an organic solvent in high purity and high yield without gelling during the reaction by allowing benzaldehyde to react with a specific sorbitol in a specific solvent in the presence of a catalyst. CONSTITUTION: In the presence of (A) a catalyst and in a mixed solvent such as a mixture of cyclohexane with hexane at a volume ratio of 25/75-75/25, (C) a solid sorbitol (for example, of

    METHOD FOR PRODUCING AROMATIC POLYCARBONATE RESIN PARTICLE
    4.
    发明专利
    METHOD FOR PRODUCING AROMATIC POLYCARBONATE RESIN PARTICLE 失效

    公开(公告)号：JPH0892381A

    公开(公告)日：1996-04-09

    申请号：JP22616194

    申请日：1994-09-21

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： KUROKI TAKASHI ,  GOTO KENICHI ,  MORI YUKIKO ,  OBUCHI SEIJI ,  OTA MASAHIRO

    IPC: C08J3/12

    Abstract: PURPOSE: To stably obtain the aromatic polycarbonate particles having a high quality in a short retention time, namely in a high treating capacity. CONSTITUTION: The method for producing the aromatic polycarbonate resin particles comprises feeding and dispersing an aromatic polycarbonate- dichloromethane solution having a polymer concentration of 40-90wt.% and held at a temperature of 45-150 deg.C into an aqueous slurry containing the aromatic polycarbonate particles, subjected to a wet grinding treatment and simultaneously circulated through a fine hole, maintaining the temperature of the aqueous slurry at a temperature higher by 5-25 deg.C than the boiling point of the dichloromethane, simultaneously evaporating the dichloromethane, and retaining the mixture for an average retention time of 1-30min.

    BRANCHED POLYIMIDE AND PREPARATION THEREOF
    5.
    发明专利
    BRANCHED POLYIMIDE AND PREPARATION THEREOF 失效

    公开(公告)号：JPH07278300A

    公开(公告)日：1995-10-24

    申请号：JP7324994

    申请日：1994-04-12

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： YOSHIDA IKUNORI ,  OTA MASAHIRO

    IPC: C08J5/18 ,  C08G73/10

    Abstract: PURPOSE:To prepare a polyimide resin which is good in moldability, such as extrudability, as well as in stretchability by introducing a particular third component into a polyimide resin in a particular proportion to form a branched structure. CONSTITUTION:A polyimide resin comprising a repeating unit of the formula I wherein X represents a direct bond or a group selected from a C1 to C10 divalent hydrocarbon radical, hexafluoroisopropylidene, carbonyl, thio, sulfinyl, and sulfonyl groups and an oxide, Y1 to Y4 represent H or a group selected from lower alkyl and lower alkoxy groups, chlorine, and bromine, R represents a tetravalent group selected from C2 or higher aliph., cyclic aliph., monocyclic arom., and polycyclic arom. groups, and W represents a trivalent group having at least three carbon atoms, provided that three amino groups are bonded to respectively different carbon atoms and not bonded to carbon atoms adjacent to each other. W is pref. one of or a mixture of two or more of groups of the formula II.

    PRODUCTION OF POLYHYDROXYCARBOXYLIC ACID
    6.
    发明专利
    PRODUCTION OF POLYHYDROXYCARBOXYLIC ACID 失效

    公开(公告)号：JPH07216064A

    公开(公告)日：1995-08-15

    申请号：JP1083894

    申请日：1994-02-02

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： OBUCHI SEIJI ,  RYU AKINORI ,  OTA MASAHIRO

    IPC: C08G63/06 ,  C08G63/88 ,  C08G63/90 ,  C08L101/16

    Abstract: PURPOSE:To obtain a polyhydroxycarboxylic acid having high molecular weight and excellent biodegradability and useful for medical material, etc., in a short time at a low cost by condensing a hydroxycarboxylic acid (or its oligomer) in a specific organic solvent subjected to a specific treatment. CONSTITUTION:This polyhydroxycarboxylic acid is produced by the dehydrative condensation of (A) a hydroxycarboxylic acid or its oligomer such as lactic acid in the presence of (B) a catalyst such as tin(oxide) under heating and refluxing in (C) an ether-type organic solvent such as anisole or an (alkyl or halogen-substituted)diphenyl ether treated by contacting with an isocyanate such as diphenylmethane-4,4'-diisocyanate, xylylene diisocyanate or tolylene-2,4- diisocyanate and separating the solvent by distillation.

    PRODUCTION OF POLYIMIDE
    8.
    发明专利
    PRODUCTION OF POLYIMIDE 失效

    公开(公告)号：JPH07149897A

    公开(公告)日：1995-06-13

    申请号：JP30282893

    申请日：1993-12-02

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： YOSHIDA IKUNORI ,  OTA MASAHIRO

    IPC: C08G73/10

    Abstract: PURPOSE:To obtain a polyimide good in molding processability and thermal stability, useful for electrical and electronic parts, etc., by polymerization of each specific diamine and tetracarboxylic dianhydride in the presence of a dicarboxylic anhydride in a solvent with specific impurities at low levels. CONSTITUTION:The polyimide of formula IV can be obtained by polymerization of (A) a diamine compound of formula I (X is direct bond, 1-20C divalent hydrocarbon, CO, S, SO, SO2, O, etc.; Y1-Y4 are H, lower alkyl, Cl, Br, etc. each) and (B) a tetracarboxylic dianhydride of formula II (R is >=2C aliphatic group or tetravalent group like aromatic group) in the presence of (C) a dicarboxylic anhydride of formula III (Z is divalent aromatic group) with the molar ratios B/A and C/A of 0.9-1.0 and 0.001-2.0, respectively, in (D) a polymerization solvent (e.g. m-cresol)

    HEAT-RESISTANT ADHESIVE
    9.
    发明专利
    HEAT-RESISTANT ADHESIVE 失效

    公开(公告)号：JPH0741752A

    公开(公告)日：1995-02-10

    申请号：JP1099994

    申请日：1994-02-02

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： TAMAI MASAJI ,  KAWASHIMA SABURO ,  SONOBE YOSHIO ,  OTA MASAHIRO ,  YAMAGUCHI TERUHIRO

    IPC: C08G73/10 ,  C09J179/08

    Abstract: PURPOSE:To obtain a heat-resistant adhesive which does not deteriorate in heat resistance and adhesiveness even when used at high temperatures by forming it from a specified polymer. CONSTITUTION:The adhesive is formed from a polymer terminated with a group of formula VI (wherein R' is the below-mentioned R or the like) or a group of formula VII and comprising repeating units of formula I [wherein Y1 is a bivalent group of formula II (wherein R is a tetravalent group of formula III or the like)] and repeating unit of formula IV (wherein Y2 is a group of formula V).

    PRODUCTION OF POLY(HYDROXY CARBOXILIC ACID)
    10.
    发明专利
    PRODUCTION OF POLY(HYDROXY CARBOXILIC ACID) 失效

    公开(公告)号：JPH072991A

    公开(公告)日：1995-01-06

    申请号：JP14736693

    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. poly(hydroxy carboxylic acid) in a short time through direct polycondensation with dehydration. CONSTITUTION:The production process comprises heating 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 a halogenated hydrcarbon.

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