초록

Process for producing alkenyl aromtic foams utilizing a cycloaliphatic gas as blowing agent, are described. Also disclosed are alkenyl aromatic foams produced by the process which exhibit increased thermal insulation properties.

대표청구항 ▼

[ What is claimed is:] [1.]1. A process for the production of alkenyl aromatic foams, said process comprising:(a) heating alkenyl aromatic resin to a temperature above its melting point to form a melted alkenyl aromatic resin;(b) adding to the melted alkenyl aromatic resin a masterbatch mix comprise

[ What is claimed is:] [1.]1. A process for the production of alkenyl aromatic foams, said process comprising:(a) heating alkenyl aromatic resin to a temperature above its melting point to form a melted alkenyl aromatic resin;(b) adding to the melted alkenyl aromatic resin a masterbatch mix comprised of:(i) styrene resin;(ii) rubbery block copolymer; and(iii) solid blowing agent, to form an alkenyl aromatic/masterbatch mix blend;(c) heating, if necessary, the alkenyl aromatic/masterbatch mix blend to a temperature sufficient to form a melted blend;(d) adding to the alkenyl aromatic/masterbatch mix blend or melted blend a non-solid blowing agent comprised of cycloaliphatic gas, wherein said cycloaliphatic gas is present in an amount equal to or greater than the amount of atmospheric gas to form an added melted blend;(e) mixing the added melted blend to form a mixed added melted blend; and(f) extruding and cooling the mixed added melted blend.