Patent ID: 9662814
Date: 2017-05-30
CPC Classifications: B29C,B32B,C08J,Y10T

Claim:
1. A process for producing a porous material containing homogeneous gas-containing inclusions having an average size of below 1 μm, comprising: (a) providing a compact packing of starting material corresponding to the porous material, said compact packing being a matrix of individual particles of the starting material in contact with one another, wherein the starting material is a thermoplastic polymer obtainable by emulsion polymerization; and the individual particles are spheres with particle radii of from 20 to 500 nm; (b) adding a supercritical gas or supercritical mixture of gases; (c) surpassing a glass transition temperature (T (d) releasing to atmospheric pressure and solidifying by falling below the T