Mitsubishi Chemical Industries Limited

Katsuhisa Koyama

Tsuneo Kimura

Flame resistance is imparted to polyamide resins by the process which comprises melting said polyamide at a temperature between the softening point of the polyamide and 250.degree.C, and adding a flameproofing quantity of a flameproofing agent to said melt, and thereafter solidifying said melt whereby said polyamide is flameproofed to an extent of UL-94, said flame proofing agent being selected from the group consisting of ##EQU1## wherein R is the same or different and represents hydrogen or lower alkyl, formamide and mixtures thereof.

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Kitakyushu, Japan

Katsuhisa Koyama