专利名称：Liquid polymers containing urethane and urea moieties and hydroxyl and/or amino
end groups and a process for the
preparation thereof
发明人：Robert F. Harris
申请号：US07/000227
reaction between pvp and amino
申请日：19870102
公开号：US04959499A
公开日：
19900925
专利内容由知识产权出版社提供
摘要：Novel polyahls having backbones containing urea, urethane and polyamine moieties and hydroxyl and/or amine terminal groups are prepared by contacting a polyamine such as an aminated polyether polyol or hexamethylene diamine with a cyclic alkylene carbonate such as propylene carbonate under conditions sufficient to form the polyahl and a monoalkylene glycol. The monoalkylene glycol is removed from the reaction mixture in order to drive the reaction to completion.
Such polyahls are useful in the preparation of isocyanate-functional prepolymers and polyurea/polyurethanes. The latter are suitably employed as flexible and rigid foams, coatings, RIM elastomers and other applications where conventional polyurethanes are employed.
申请人：THE DOW CHEMICAL COMPANY
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