Dicarboxylate-capped polyphenylene ether with trimellitic acid anhydride
salicylate ester
    7.
    发明授权
    Dicarboxylate-capped polyphenylene ether with trimellitic acid anhydride salicylate ester 失效
    二羧酸封端的聚苯醚与偏苯三酸酐水杨酸酯

    公开(公告)号:US4988775A

    公开(公告)日:1991-01-29

    申请号:US474880

    申请日:1990-02-05

    IPC分类号: C08G65/48 C08L71/12 C08L77/00

    摘要: Polyphenylene ethers are capped by reaction in the melt, with application of vacuum, with at least one trimellitic anhydride salicylate ester, preferably the 4-(phenyl salicylate) ester. The preferred melt processing method is extrusion with vacuum venting. By this method, the polyphenylene ether is capped with reactive dicarboxylate groups and also with salicylate groups, improving its thermal stability. The capped polyphenylene ether is capable of forming copolymers with polyamides, and said copolymers are useful as compatibilizers for polyphenylene ether-polyamide blends.

    摘要翻译: 聚苯醚在熔体中与真空下与至少一种偏苯三酸酐水杨酸酯,优选4-(苯基水杨酸酯)酯反应来封端。 优选的熔融加工方法是用真空排气挤出。 通过该方法,聚苯醚被反应性二羧酸酯基团和水杨酸酯基团封端,提高其热稳定性。 封端的聚苯醚能够与聚酰胺形成共聚物,所述共聚物可用作聚苯醚 - 聚酰胺共混物的相容剂。

    Catalytic method of preparing carboxy derivatives of polyphenylene ethers
    8.
    发明授权
    Catalytic method of preparing carboxy derivatives of polyphenylene ethers 失效
    制备聚苯醚羧基衍生物的催化方法

    公开(公告)号:US4808671A

    公开(公告)日:1989-02-28

    申请号:US184328

    申请日:1988-04-21

    IPC分类号: C08G65/48

    CPC分类号: C08G65/485

    摘要: Carboxylated polyphenylene ethers are prepared by reaction of the polyphenylene ether with an ester such as a 4-alkyl or 4-aryl ester of trimellitic anhydride. The methyl, ethyl and o-carbophenoxyphenyl esters are preferred; the latter caps the polyphenylene ether in addition to carboxylating it. The reaction takes place in the presence of a triaryl phosphite, at a temperature in the range of about 225.degree.-350.degree. C.