Fluorine-containing polyether and process for preparing the same
    1.
    发明授权
    Fluorine-containing polyether and process for preparing the same 失效
    含氟聚醚及其制备方法

    公开(公告)号:US4904417A

    公开(公告)日:1990-02-27

    申请号:US201032

    申请日:1988-06-01

    摘要: A fluorine-containing polyether of the formula:A--X--A'wherein A and A' are the same or different and are each --COF, --COCl or --COOH, and X is --CF.sub.2 CF.sub.2 --R.sub.f --O--C.sub.m F.sub.2m --O--R.sub.f 'CF.sub.2 CF.sub.2 -- in which R.sub.f and R.sub.f ' are the same or different and are each a group containing a perfluoroalkylpolyether group, and m is a number of from 1 to 6, and a fluorine-containing polyether of the formula:Z--X.sub.n --Z'wherein X is the same as defined above, Z and Z' are the same or different and are each --COF, --COCl, --COOH or --CF.sub.2 CF.sub.2 --R.sub.f --B in which R.sub.f is the same as defined above and B is a fluorine atom or a C.sub.1 -C.sub.5 perfluoroalkyl group, and n is a number of from 0 to 100 provided that when n is 1, Z and Z' are each --CF.sub.2 CF.sub.2 R.sub.f B, provided that when n is 0, both Z and Z' are each --CF.sub.2 CF.sub.2 R.sub.f B or when n is 1, at least one of Z and Z' is --CF.sub.2 CF.sub.2 R.sub.f B.

    Termiticides
    2.
    发明授权
    Termiticides 失效
    杀白蚁剂

    公开(公告)号:US5279820A

    公开(公告)日:1994-01-18

    申请号:US613074

    申请日:1990-11-15

    摘要: A termiticide comprising, as an active ingredient, a polymer which comprises repeating units of the formula:--C.sub.x F.sub.2x O--wherein x is an integer of 1 to 4, or the formula:--CX.sub.1 X.sub.2 CF.sub.2 CF.sub.2 O--wherein X.sub.1 and X.sub.2 are the same or different and each a hydrogen atom, a fluorine atom or a chlorine atom, provided that X.sub.1 and X.sub.2 are not fluorine atoms simultaneously, and has at least one polar group at polymer chain ends, which has no or little toxicity on the human beings or animals and long-lasting termiticidal effects.

    摘要翻译: 一种杀白蚁剂,其包含作为活性成分的聚合物,其包含下式的重复单元:-C x F 2 x O - ,其中x为1〜4的整数,或式:-CX 1 X 2 CF 2 CF 2 O-,其中X 1和X 2相同或不同, 氢原子,氟原子或氯原子,条件是X1和X2不同时为氟原子,并且在聚合物链末端具有至少一个极性基团,对人或动物无毒性或毒性较小, 持久的杀螨作用。

    Process for producing polyhydroxycarboxlic acid
    7.
    发明授权
    Process for producing polyhydroxycarboxlic acid 失效
    生产多羟基羧酸的方法

    公开(公告)号:US5883222A

    公开(公告)日:1999-03-16

    申请号:US849389

    申请日:1997-06-03

    IPC分类号: C08G63/82 C08G63/56

    CPC分类号: C08G63/823

    摘要: The present invention provides a process for producing polyhydroxycarboxylic acids having a weight-average molecular weight of 50,000 or above which are excellent as biodegradable plastics by subjecting Lactides to ring-opening polymerization in the presence of an inorganic solid acid catalyst carrying silica and/or a light metal.

    摘要翻译: PCT No.PCT / JP96 / 02874 Sec。 371日期:1997年6月3日 102(e)日期1996年6月3日PCT提交1996年10月3日PCT公布。 公开号WO97 / 12926 日期1997年04月10日本发明提供一种生产重均分子量为50,000以上的多羟基羧酸的方法,其通过在载体上无机固体酸催化剂的存在下使乳酸进行开环聚合,作为可生物降解的塑料是优异的 二氧化硅和/或轻金属。