Preparation process of heat-resistant polymers from polycarboxylic acids or anhydrides in the presence of an alkali metal fluoride and quaternary onium salt
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.
Claims9
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, wherein said alkali metal fluoride is used in combination with a quaternary onium salt represented by the following formula:
- ##STR2## wherein Z represents a nitrogen atom or a phosphorus atom, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represent an alkyl, cycloalkyl, aralkyl or aryl group, or wherein any two adjacent R.sub.1, R.sub.2, R.sub.3 or R.sub.4 groups construct a structure of a heterocyclic compound with the central atom Z or further with other hetero atoms, and X represents a halogen atom, a nitrile or hydroxyl group.
Dependencies are inferred from the claim text.