Polyamide foam prodn - by mixing polymerising first compsn contg molten lactam/catalyst and second liquid compsn contg pr

摘要

Polyamide foam is produced by (a) forming a compsn. (I) contg. a lactam and a basic catalyst at a temp. above the m.p. of the lactam, (b) forming a liquid compsn. (II) contg. a promoter and a blowing agent at ambient temp., (c) mixing compsns. (I) and (II) with vigorous stirring to initiate the polymsn. (d) pouring the reaction mixt. into a container before the polymsn. of the lactam has exceeded 10 esp. 5%, and (e) completing the polymsn. A wide range of blowing agents can be used, including agents which volatilise and agents which decompose. Process is easily controlled and uniform foam pdts. are obtained.