Patent ID: 6528570
Filing Date: 2003-03-04
Classification: C08F,C08K

Abstract:
Expandable polymer particles containing a polymer of a vinylarene monomer, a porous silicate compound, and water, wherein the porous silicate compound is selected from the group consisting of alumino silicates and amorphous silica particles and the porous silicate compound is incorporated in said polymer in an amount ranging from about 0.1 to about 10% by weight based on the weight of vinylarene, water and porous silicate compound so as to retain said water in said particles in an amount ranging from 1.5% to about 20% by weight based on the weight of vinylarene, water and porous silicate for use of said water as essentially the sole blowing agent in said expandable particles for the production of pre-expanded polymer particles from said expandable particles.