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    Process for the production of highly elastic molded polyurethane articles
    8.
    发明专利
    Process for the production of highly elastic molded polyurethane articles 未知

    公开(公告)号：GB1078542A

    公开(公告)日：1967-08-09

    申请号：GB4933864

    申请日：1964-12-04

    Applicant: BASF AG

    Inventor： GEHM ROBERT ,  KUNDE JOACHIM ,  MERTES FRIEDRICH

    IPC: C08G18/10

    Abstract: Elastic moulded polyurethane articles are prepared by reacting in solution in an inert polar solvent a linear isocyanate modified polyhydroxyl compound of M.W. 750-6000 and a melting point below 50 DEG C. having terminal -NCO groups with a dihydrazino-di-s-triazino compound in which monohydrazino-s-triazines are linked via a bivalent diamine radical, and moulding the resulting solution while removing the solvent by heating. The dihydrazino compound may have the formula where A is a diamine radical attached to the triazine rings via its nitrogen atoms and B is hydrogen chlorine or a monovalent aliphatic or aromatic group of 1-8 C or -OR, or -NR1R2, where R1 and R2 are hydrogen or monovalent aliphatic or aromatic groups of 1-8 C.

    PRODUCTION OF MODIFIED POLYALKYLENE TEREPHTHALATES
    10.
    发明专利
    PRODUCTION OF MODIFIED POLYALKYLENE TEREPHTHALATES 未知

    公开(公告)号：CA1050693A

    公开(公告)日：1979-03-13

    申请号：CA204585

    申请日：1974-07-11

    Applicant: BASF AG

    Inventor： STREHLER HUGO ,  BEER LUDWIG ,  KUNDE JOACHIM ,  MATTHIES HANS G ,  POHLEMANN HEINZ

    IPC: C08G63/00 ,  C08G63/181 ,  C08G63/183 ,  C08G63/78 ,  C08G63/18 ,  C08G63/22

    Abstract: A process for the production of a modified polyalkylene terephthalate from the radical of terephthalic acid and the radical of a glycol of two to six carbon atoms in which from 1 to 50 mole % of the terephthalic acid radical has been replaced by an aliphatic dicarboxylic acid radical of four to twelve carbon atoms. The aliphatic dicarboxylic acid is esterified by heating with the glycol in a molar ratio of from 1:1.2 to 1:1.8 at a temperature of from about 5 to 20.degree.C below the boiling point of the glycol until the degree of esterification is from 90 to 95 mole % based on the aliphatic dicarboxylic acid; a dialkyl terephthalate is transesterified with the glycol in a molar ratio of from 1:1.2 to 1:2 in the presence of a catalyst in an amount of from 0.01 to 0.2% by weight base on dialkyl-terephthalate by heating to a temperature of from 130.degree. to 240.degree.C at atmospheric pressure until at least 95% of the alkoxy groups present have been eliminated. The esterification product is mixed with the transesterification product and polycondensation is carried out at a temperature of from 240.degree. to 290.degree.C and a pressure of from 0.1 to 760 mm, in the presence of a catalyst in an amount of from 0.01 to 0.2% by weight based on the polyester. The polyester obtained is suitable for example for mouldings or as an adhesive.

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