Process for preparing low-viscosity allophanates containing actinically curable groups
申请人:Ludewig Michael
公开号:US20060079660A1
公开(公告)日:2006-04-13
The present invention provides a process for preparing radiation-curing allophanates having residual monomer contents of less than 0.5% by weight and an NCO content of less than 1% by weight, wherein (A) compounds containing isocyanate groups, (B) hydroxy-functional compounds which contain groups which react, with polymerization, with ethylenically unsaturated compounds on exposure to actinic radiation (radiation-curing groups) and (C) optionally further compounds containing NCO-reactive groups, also optionally in the presence of a catalyst, are used to form NCO-group-containing urethanes having radiation-curing groups, which are subsequently reacted, without further addition of compounds containing isocyanate groups, in the presence of an allophanatization catalyst, the ratio of NCO groups of the compounds from A) to the OH groups of the compounds from B) and, where used, C) being 1.45:1.0 to 1.1:1.0.
本发明提供了一种制备辐射固化异番酸盐的工艺,其残余单体含量小于 0.其中(A)含有异氰酸酯基团的化合物;(B)羟基官能团化合物,其所含的基团在聚合反应中会与乙烯基不饱和化合物在暴露于光辐射下时发生反应(辐射固化基团);(C)可选地进一步含有 NCO 反应基团的化合物、也可选择在催化剂存在下使用,以形成具有辐射固化基团的含 NCO 基团的聚氨酯,随后在异氰酸酯催化剂存在下进行反应,无需再添加含异氰酸酯基团的化合物,A) 中化合物的 NCO 基团与 B) 和(如使用)C) 中化合物的 OH 基团的比例为 1.45:1.0 至 1.1:1.0。