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    RECOVERY OF SOLVENT FOR POLYCONDENSATION REACTION
    12.
    发明专利
    RECOVERY OF SOLVENT FOR POLYCONDENSATION REACTION 失效

    公开(公告)号：JPS5796019A

    公开(公告)日：1982-06-15

    申请号：JP17261280

    申请日：1980-12-09

    Applicant: UBE INDUSTRIES

    Inventor： KANEDA TAKAHO ,  ISHIKAWA SEIJI ,  NAKAGAWA KANJI ,  UEDA MASAHIRO

    IPC: C08G69/00 ,  C08G69/46

    Abstract: PURPOSE:The polycondensation reaction for aromatic polyamide is conducted in a solvent such as dimethylacetamide or methylpyrrolidone and the resultant small-piece polyamide containing the solvent is subjected to extraction with an organic chlorine solvent to permit the recovery of the solvent for polycondensation reaction in high yield. CONSTITUTION:The reaction of an aromatic dibasic acid dichloride with an aromatic diamine is conducted in a solvent selected from (A) N,N-dimethylacetamide and N-methylpyrrolidone or a mixture thereof with (B) another solvent selected from 1,3-dimethyl-2-imidazolidinone, N-methylcaprolactam and N-acetylpyrrolidine at -10-80 deg.C to produce small-piece product of aromatic polyamide such as poly-p-phenylene terephthalamide or its copolyamide containing the solvent. Then, the solvent is extracted with an organic chlorine solvent such as dichloroethane and recovered by distillation.

    AROMATIC POLYAMIDE FIBER AND ITS PRODUCTION
    13.
    发明专利
    AROMATIC POLYAMIDE FIBER AND ITS PRODUCTION 失效

    公开(公告)号：JPS569425A

    公开(公告)日：1981-01-30

    申请号：JP8491579

    申请日：1979-07-06

    Applicant: UBE INDUSTRIES

    Inventor： KANEDA TAKAHO ,  ISHIKAWA SEIJI ,  DAIMON HIROSHI ,  UEDA MASAHIRO ,  HONDOU TADAHIRO

    IPC: D01F6/80

    Abstract: PURPOSE:To obtain the titled fiber having improved initial modulus, tensile strength, knot strength and heat resistance, by wet spinning a solution of a polyamide comprising a dichlorobenzidinesulfonic acid as a diamine component in a conc. sulfuric acid. CONSTITUTION:A polyamide consisting of (A) a dichlorobenzidinesulfonic acid of formula I and (B) p-phenylene-diamine of formula II as an amine component and (C) terephthalic acid of formula III as an acid component is dissolved in a >=98% conc sulfuric acid. The resulting solution is extruded to give the objective fiber having an initial modules >=400g/d and a tensile strength >=14g/d. The molar ratio of (A) to (B) is preferably 10:90-50:50. The fiber is then heat-treated if necessary at 200-600 deg.C within 15sec under a tension of 5g/d or lower. EFFECT:Improved adhesiveness to various plastics and rubbers.

    PREPARATION OF 3*3**4*4**BIPHENYLTETRACARBOXYLIC ACID SALT
    14.
    发明专利
    PREPARATION OF 3*3**4*4**BIPHENYLTETRACARBOXYLIC ACID SALT 失效

    公开(公告)号：JPS5520705A

    公开(公告)日：1980-02-14

    申请号：JP9247078

    申请日：1978-07-31

    Applicant: UBE INDUSTRIES

    Inventor： KANEDA TAKAHO ,  DAIMON HIROSHI ,  UEDA MASAHIRO ,  HONDOU TADAHIRO

    IPC: C07C63/331 ,  C07B37/04 ,  C07C51/00 ,  C07C51/347 ,  C07C67/00

    Abstract: PURPOSE:To prepare a 3,3',4,4'-brphenyltertracarboxylic acid salt, selectively, in high yield, by carrying out coupling reaction of a mixture of halogenated o-phthalic acid salts containing a 4-halogeno-o-phthalic acid salt in an aqueous solution containing an alkali hydroxide. CONSTITUTION:A desired compound is prepared by carrying out the thermal coupling reaction of a mixture of halogenated o-phthalic acid salts containing a 4-halogeno-o-phthalic acid salt (30 - 99.5 mole % on the basis of the total amount of the halogenated-o-phthalic acid salts) in an aqueous solution containing an alkali hydroxide at 50 - 150 deg.C for 0.2 - 30 hr in the presence of a matallic Pd catalyst carried on a carrier, preferably Pd/C or Pd/calcium carbonate catalyst, and a samll amount of methanol. The by-produced o-phthalic acid salts are recovered as o-phthalic acid or its anhydride and can be recycled for the preparation of the halogenated phthalic acid salts. USE:Raw material of polyimide resin.

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