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    Co-polymers of perfluoronitrosomethane and hexafluoropropylene and process of preparing same
    4.
    发明授权
    Co-polymers of perfluoronitrosomethane and hexafluoropropylene and process of preparing same 失效
    全氟亚硝基甲烷和六氟丙烯的共聚物及其制备方法

    公开(公告)号：US3114741A

    公开(公告)日：1963-12-17

    申请号：US83997359

    申请日：1959-09-14

    申请人： NAT RES DEV

    发明人： NEVILLE HASZELDINE ROBERT ,  JOHN WILLIS CHRISTOPHER

    IPC分类号： C08F214/28 ,  C08G73/26

    CPC分类号： C08F214/28 ,  C08G73/26

    摘要： A perfluorinated nitrosoalkane (RNO) and hexafluoropropylene are copolymerized at at least 50 DEG C. and 30 atmospheres absolute to yield a copolymer having repeating units of the structure where R is a perfluoroalkyl group and X is F and Y is CF, or vice versa. It is preferred to use equimolar proportions of the monomers, which proportion is found in the product regardless of the initial proportions of the reactants. In the specific example trifluoronitrosomethane is used. The copolymer products range from oils to waxes and elastomeric gels and are insoluble in water and common organic solvents. They may be used as coolants, heat transfer media, coating and sealing compositions, flexible hosing and lubricants, especially under chemically corrosive conditions.ALSO:Polymers comprising structural units of the formula where R is a perfluoroalkyl group and X is F and Y is CF3 or vice versa are obtained by heating hexafluoropropylene with a perfluoronitrosoalkane under pressure. To obtain high polymers (see Group IV(a)) the minimum pressure is 30 atmospheres absolute. At pressures up to 60 atmospheres a temperature of 100 DEG C. is needed; above 60 atmospheres the minimum temperature is 50 DEG C.