EXPANSIBLE VINYL AROMATIC COMPOSITION, EXPANDED GLUBES, EXPANDED ITEMS, AND PROCESSES FOR PREPARING VINYL AROMATIC EXPANSIBLE COMPOSITIONS, AND FOR PREPARING IN CONTINUOUS PASTA EXPANDABLE VINYL GRAIN COMPOSITIONS

摘要

An expandable composition comprising: a. a polymeric matrix selected from: a1. a copolymer containing: 90-99.995% of at least one vinyl aromatic monomer; and 0.005-10% by weight of a salt or ester of styrene sulfonic acid; or a2. a polymeric mixture comprising: 92-99.995% by weight of a vinyl aromatic (co) polymer; and 0.005-8% by weight of a product selected from a salt or ester of styrene sulfonic acid and a copolymer of styrene with a C1-C4 salt or ester of styrene sulfonic acid; and b. 1-10% by weight, calculated with respect to the polymeric matrix (a), of an expanding agent.