Polyamide foam with compact skin-cellular core - from polyamide with specified reduced specific viscosity and glass transition temperature

摘要

A foam structure is claimed, having a density of 0.5-1.1 g/cm3, and consisting of a polyamide having a reduced specific viscosity (25 degrees C on a soln. of 1 g polyamide in 100 ml phenol/tetrachloroethane with a wt. ratio of 60-40) of 0.6-3.0 dl/g, and a glass transition temp. 100 degrees C, the polyamide being transparent in the unfoamed state.