Process for preparing poly(vinyl trifluoroacetate) and
poly(vinyltrifluoroacetate/vinyl ester) copolymers in supercritical Co.sub
.
    5.
    发明授权
    Process for preparing poly(vinyl trifluoroacetate) and poly(vinyltrifluoroacetate/vinyl ester) copolymers in supercritical Co.sub . 失效
    在超临界Co2中制备聚(乙烯基三氟乙酸酯)和聚(乙烯基三氟乙酸酯/乙烯基酯)共聚物的方法

    公开(公告)号:US5559198A

    公开(公告)日:1996-09-24

    申请号:US273421

    申请日:1994-07-08

    摘要: A method for the production of poly(vinyl trifluoroacetate) and copolymers thereof with vinyl esters is described. Poly(vinyl trifluoroacetate) (PVTFA) is obtained in relatively high yield under mild conditions by using carbon dioxide under supercritical conditions as a solvent. Synthesis of syndiotactic PVTFA on a commercial scale without the use of environmentally-harmful solvents is made possible by the invention, which provides a convenient route to syndiotactic polyvinyl alcohol.

    摘要翻译: 描述了制备聚(乙烯基三氟乙酸盐)及其与乙烯基酯的共聚物的方法。 通过在超临界条件下使用二氧化碳作为溶剂,在温和条件下以相对高的产率获得聚(乙烯基三氟乙酸盐)(PVTFA)。 通过本发明可以在商业规模上合成间同立构PVTFA而不使用环境有害的溶剂,这提供了间同立构聚乙烯醇的方便途径。