VERFAHREN ZUR HERSTELLUNG VON POLYVINYLACETALEN

    公开(公告)号:EP1539830A1

    公开(公告)日:2005-06-15

    申请号:EP03757786.3

    申请日:2003-09-04

    IPC分类号: C08F8/28

    摘要: The invention relates to a method for producing polyvinylacetals that can be obtained by saponifying a vinylester polymer and subsequently acetalizing the polyvinyl alcohol, which is obtained therewith, with one or more aldehydes selected from the group consisting of aliphatic and aromatic aldehydes having 1 to 15 C atoms, whereby: a) the polyvinyl alcohol is present in an aqueous medium; b) a pH value of

    摘要翻译: 本发明涉及一种制备聚乙烯醇缩醛的方法,该方法可以通过将乙烯基酯聚合物皂化并随后用与一种或多种选自具有1至15℃的脂族和芳族醛的醛缩醛化由其获得的聚乙烯醇 其中:a)聚乙烯醇存在于水性介质中; b)任选地通过加入酸来设定<1的pH值; c)通过加入醛组分引发缩醛化,并且; d)通过过滤将沉淀的聚乙烯醇缩醛与滤液分离。 本发明的方法的特征在于,10-100重量%的含水介质由之前制备的滤液组成,d)中制得的滤液任选地再用于另一制剂中。