METHOD OF PRODUCING THERMOPLASTIC RESIN-BASE POROUS MATERIALS Russian patent published in 1997 - IPC

FIELD: polymers. SUBSTANCE: porous material is produced by mixing thermoplastic resin with filling agent followed by frothing the mixture during forming at heating. Filling agent: mineral filling agent at porosity 10-12% and humidity up to 15% taken from group involving: zeolite, schungite, apatite (particle size is 0.04-1.0 mm) at amount 10-75 wt.-% per 100 wt.-% mixture. Frothing is carried out at polymer melting point for 15-20 min. Properties: contraction is 7-22%, porosity of material is 8-62%. Material is used in different branches (heat-insulating materials, encapsulation of aromatic substances, poisons, repellents). EFFECT: improved method of producing, enhanced quality. 2 tbl