发明授权
US5428124A Urea and biuret liquid prepolymers of MDI 失效
MDI的脲和缩二脲液体预聚物

Urea and biuret liquid prepolymers of MDI
摘要:
Storage stable, liquid prepolymers of diphenylmethane diisocyanate containing urea and/or biuret groups are prepared by reacting an aminocrotonate with a mixture of isocyanates having a specified diphenylmethane diisocyanate isomer content. These prepolymers have isocyanate group contents of from about 5 to about 30%.
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