PROCESS OF FORMING A RESINOUS POLYMER CONTAINING AN HYDRIDE GROUPS

摘要

Anhydride-contg. polymers are foamed with (NH4)2CO2, NH4HCO3, or ammonium oxalate to give products having good heat distortion properties and avoiding org. blowing agents. Thus, maleic anhydride-styrene copolymer 400, 1:1 polystyrene-dibutyl phthalate binder 1.32, talc 4, and NH4HCO3 20g were mixed and extruded at 165≦̸C die temp. at 1000 spi to give a white foam with uniform cell structure having d. 2.4 lbs/ft3.