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2. 发明授权

US5034475A Graft polymers, containing polyvinyl acetal groups, on polyurethane grafting substrates, processes for the preparation thereof, and the use thereof 失效
标题翻译：在聚氨酯接枝基材上含有聚乙烯醇缩醛基的接枝聚合物，其制备方法及其用途
公开(公告)号：US5034475A
公开(公告)日：1991-07-23
申请号：US424064
申请日：1989-10-19
申请人： Matthias Kroggel , Karl-Josef Rauterkus , Hans-Dieter Hermann
发明人： Matthias Kroggel , Karl-Josef Rauterkus , Hans-Dieter Hermann
IPC分类号： C08F8/28 , C08F283/00
CPC分类号： C08F283/006 , C08F8/12 , C08F8/48
摘要： Polymers with polyvinyl acetal groups, which contain acetalized polyvinyl alcohol groups on polyurethane grafting substrates and which are prepared from graft polymers, containing vinyl alcohol groups on polyurethane grafting substrates, by reaction with aldehydes according to known methods. The aldehydes used can be any known aldehydes capable of acetalization reactions.The polyurethane grafting substrates contain at least 2 urethane groups in the molecule and units from diisocyanates and diols, and polymer radicals of units of vinyl carboxylates having 3 to 20 carbon atoms and/or hydrolysis products thereof and, if appropriate, further monomer units are grafted onto the polyurethane grafting substrates. The proportion of vinyl alcohol units in the hydrolyzed or partially hydrolyzed graft polymers before the acetalization is >10% by weight.In the acetalized polymer, the content of residual unacetalized vinyl alcohol units is >7.5 mol %, relative to the molar content (=100 mol %) of vinyl alcohol units in the starting graft polyvinyl alcohol before acetalization.The graft polyvinyl acetals may be used as a constituent of coating compositions, as a coating agent constituent for the diverse substrates, as a material for thermoplastically processable moldings and as an interleaving film in laminated glasses.
摘要翻译：具有聚乙烯醇缩醛基的聚合物，其在聚氨酯接枝基材上含有缩醛化的聚乙烯醇基，并且通过根据已知方法与醛反应，通过在聚氨酯接枝基材上含有乙烯醇基团的接枝聚合物制备。使用的醛可以是能够进行缩醛化反应的任何已知的醛。聚氨酯接枝基材在分子中含有至少2个氨基甲酸酯基团和来自二异氰酸酯和二醇的单元和具有3至20个碳原子的羧酸乙烯酯单体和/或其水解产物的单元的聚合物基团，并且如果合适的话，其它单体单元被接枝到聚氨酯接枝基材上。在缩醛化之前的水解或部分水解的接枝聚合物中的乙烯醇单元的比例为> 10重量％。在缩醛化聚合物中，相对于缩醛化前的起始接枝聚乙烯醇中的乙烯醇单元的摩尔含量（= 100摩尔％），残余的非缩醛化乙烯醇单元的含量为> 7.5摩尔％。接枝聚乙烯醇缩醛可用作涂料组合物的组分，作为用于各种基材的涂料组分，作为热塑性可加工模制品的材料和层压玻璃中的交织膜。

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