Preparation of p-(1,1-dimethyl-2-hydroxyethyl)benzoic acid
    11.
    发明授权
    Preparation of p-(1,1-dimethyl-2-hydroxyethyl)benzoic acid 失效
    对 - (1,1-二甲基-2-羟乙基)苯甲酸的制备

    公开(公告)号:US4393233A

    公开(公告)日:1983-07-12

    申请号:US337900

    申请日:1982-01-07

    摘要: The subject polymers are novel homopolymers and copolymers. The homopolymers are characterized by relatively high T.sub.g of about 120.degree. C. relative to their T.sub.m of about 250.degree. C., whereby they can readily be fabricated into fibers, films and like structures from the melt, and retain strength above 100.degree. C. The copolymers have T.sub.g 's intermediate between those of the homopolymers of the constituent monomers, and can be fabricated as for the subject homopolymers.Novel processes of obtaining the monomer, p-(1,1-dimethyl-2-hydroxyethyl)benzoic acid, are disclosed.

    摘要翻译: 主题聚合物是新的均聚物和共聚物。 均聚物的特征在于相对于它们的Tm约为250℃的约120℃的相对高的Tg,由此它们可以容易地从熔体制成纤维,薄膜和类似结构,并保持高于100℃的强度。 共聚物的Tg在构成单体的均聚物之间的中间体,并且可以与目标均聚物一样制备。 公开了获得单体对 - (1,1-二甲基-2-羟乙基)苯甲酸的新方法。

    Polycarbonates with suppressed aging characteristics
    12.
    发明授权
    Polycarbonates with suppressed aging characteristics 失效
    具有抑制老化特性的聚碳酸酯

    公开(公告)号:US4374973A

    公开(公告)日:1983-02-22

    申请号:US283330

    申请日:1981-07-15

    IPC分类号: C08G63/64 C08G63/62

    CPC分类号: C08G63/64

    摘要: Polycarbonate copolymers from bisphenol-A containing terephthalate moieties constituting 5 or 10 mol percent of the polymer, whereby after long exposure to working temperature the polymer retains Izod impact resistance of at least 9 ft. -lbs. per inch of notch.

    摘要翻译: 来自双酚A的对苯二酸酯部分的聚碳酸酯共聚物构成聚合物的5或10摩尔%,由此在长时间暴露于工作温度之后,聚合物保持至少9英尺-1磅的艾佐德冲击抗力。 每英寸的切口。