发明授权
US4379862A Process for the preparation of polyurethane resins using low molecular weight polyhydroxyl compounds prepared by the condensation of formaldehyde 失效
使用由甲醛缩合制备的低分子量多羟基化合物制备聚氨酯树脂的方法

Process for the preparation of polyurethane resins using low molecular
weight polyhydroxyl compounds prepared by the condensation of
formaldehyde
摘要:
This invention relates to a process for the preparation of polyurethane resins by the reaction of polyisocyanates with a mixture of various low molecular weight hydroxyaldehydes, hydroxyketones and polyhydric alcohols obtained by an improved process for the condensation of formaldehyde with itself.
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