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US3997513A Solution for forming thermal resisting polymers 失效
用于形成耐热聚合物的溶液

Solution for forming thermal resisting polymers
摘要:
A concentrated solution suitable for forming thermal resisting polymers having a high degree of polymerization comprising a mixture of a prepolymer solution prepared by the reaction of an organic diisocyanate or diamine and a molar excess of 1,2,3,4-butanetetracarboxylic acid or an anhydride of the acid, and a blocked polyisocyanate.
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