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公开(公告)号:US07351765B2
公开(公告)日:2008-04-01
申请号:US10513691
申请日:2003-09-04
IPC分类号: C08F8/00
CPC分类号: C08F8/28 , Y10T428/31833 , C08F8/48 , C08F16/06
摘要: Polyvinyl acetals are obtained in a cost-effective and environmentally advantageous manner by employing as at least a portion of the aqueous acetalization medium, the mother liquor from a previous acetalization reaction.
摘要翻译: 通过采用至少一部分水性缩醛化介质,来自先前的缩醛化反应的母液,以成本有效和环境有利的方式获得聚乙烯醇缩醛。
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公开(公告)号:US20050171280A1
公开(公告)日:2005-08-04
申请号:US10513691
申请日:2003-09-04
CPC分类号: C08F8/28 , Y10T428/31833 , C08F8/48 , C08F16/06
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: 本发明涉及一种生产聚乙烯醇缩乙醛的方法,该方法可以通过将乙烯基酯聚合物皂化并随后用其中一种或多种醛选自具有1至15个碳原子的脂族和芳族醛, 原子,其中:a)聚乙烯醇存在于水介质中; b)pH值<1的任选地通过加入酸来设定; c)通过加入醛成分引发缩醛化, d)通过过滤将沉淀的聚乙烯醇缩乙醛与滤液分离。 本发明的方法的特征在于,10至100重量%的水性介质由先前制备的滤液组成,并且在d)中产生的滤液任选地再次用于另一种制剂。
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