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21. 发明授权

US4910332A Process for the preparation of polyisocyanates containing urethane groups and the products obtained 失效
标题翻译：制备含有氨基甲酸酯基团的多异氰酸酯的方法和所得产品
公开(公告)号：US4910332A
公开(公告)日：1990-03-20
申请号：US269230
申请日：1988-11-09
申请人： Lothar Kahl , Josef Pedain , Wolfgang Wellner
发明人： Lothar Kahl , Josef Pedain , Wolfgang Wellner
IPC分类号： C08G18/10 , C07C271/28 , C08G18/72 , C08G18/79 , C08G18/80 , C08G18/82
CPC分类号： C08G18/721 , C07C271/28 , C08G18/792 , C08G18/8009 , C08G18/8064
摘要： The present invention is directed to a process for the preparation of polyisocyanates containing urethane groups in which the content in monomeric starting diisocyanate is at most 0.4% by weight by reacting in a urethane-forming reaction(a) an excess quantity, based on component (b), of a diisocyanate component containing at least one aromatic diisocyanate which is free from urethane groups with(b) a polyol component containing at least one polyhydric alcohol in the molecular weight range of 62 to about 250followed by distillative removal of the unreacted excess starting diisocyanate (a), characterized in that before the distillative removal of the excess starting diisocyanate (a) is carried out,(c) an aliphatic polyisocyanate containing isocyanurate groups is incorporated in the urethane-containing reaction product of components (a) and (b) in a quantity of about 0.3 to 10% by weight, based on the undistilled reaction product of components (a) and (b), and the distillation residue is then optionally dissolved in an inert solvent and up to about 0.5 equivalents of an alcohol, per kg of solvent-free distillation residue on a solvent free basis is added to the resulting solution so that the amount of free starting diisocyanate (a) is further reduced and urethane groups are formed.The present invention is also directed to the polyisocyanates containing urethane groups obtained by this process.
摘要翻译：本发明涉及一种制备含有氨基甲酸酯基团的多异氰酸酯的方法，其中单体起始二异氰酸酯的含量至多为0.4重量％，其中在氨基甲酸酯形成反应（a）过量时，基于组分（ b），含有至少一种不含氨基甲酸酯基团的芳族二异氰酸酯的二异氰酸酯组分，（b）含有至少一种分子量范围为62至约250的多元醇的多元醇组分，然后蒸馏除去未反应的过量起始二异氰酸酯（a），其特征在于，在蒸馏除去过量的起始二异氰酸酯（a）之前，（c）将含有异氰脲酸酯基团的脂族多异氰酸酯引入组分（a）和（ b）基于组分（a）和（b）的未蒸馏反应产物，其量为约0.3至10重量％，蒸馏残余物然后任选地溶解在惰性溶剂中，并且在无溶剂基础上将每kg无溶剂蒸馏残余物最多至多约0.5当量的醇加入到所得溶液中，使得游离起始二异氰酸酯（a）的量进一步还原和氨基甲酸酯基团形成。本发明还涉及通过该方法获得的含有氨基甲酸酯基团的多异氰酸酯。

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