Dense fluoropolymer film
    33.
    发明授权

    公开(公告)号:US11118044B2

    公开(公告)日:2021-09-14

    申请号:US14653413

    申请日:2013-12-17

    Abstract: The present invention pertains to a process for the manufacture of a dense film. The process includes processing, in a molten phase, a solid composition [composition (C)] comprising;
    at least one vinylidene fluoride (VDF) fluoropolymer comprising one or more carboxylic acid functional end groups [polymer (F)],
    at least one poly(alkylene oxide) (PAO) of formula (I): HO—(CH2CHRAO)n—RB  (I) wherein RA is a hydrogen atom or a C1-C5 alkyl group, RB is a hydrogen atom or a —CH3 alkyl group and n is an integer comprised between 2000 and 40000, preferably between 4000 and 35000, more preferably between 11500 and 30000, and -optionally, at least one inorganic filler [filler (I)]; thereby providing a dense film having a thickness of from 5 μm to 30 μm.
    The present invention also pertains to the dense film provided by this process and to the use of the dense film as dense separator in electrochemical devices.

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