Preparation process of heat-resistant polymers from polycarboxcylic acids and anhydrides in the presence of an alkali metal fluoride
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsMasahiro Kouno, Akihiro Yamaguchi, Masanori Osawa, Kohei Shizuka, Hiromi Nakano, Kazumi Mizutani
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Abstract
Disclosed herein is a process for preparing heat-resistant polymers by reacting an organic polyisocyanate with one or more compounds selected from the group consisting of organic polycarboxylic acids and organic polycarboxylic acid anhydrides in the presence of an alkali metal fluoride or an alkali metal fluoride combined with a quaternary onium salt as a catalyst.
Claims5
A process for preparing a heat-resistant polymer which comprises reacting an organic polyisocyanate with one or more compounds selected from the group consisting of organic polycarboxylic acids and organic polycarboxylic acid anhydrides in the presence of an alkali metal fluoride as a catalyst.
Dependencies are inferred from the claim text.