Enlarged cell size foams made from blends of alkenyl aromatic po

Details Enlarged cell size foams made from blends of alkenyl aromatic po Enlarged cell size foams made from blends of alkenyl aromatic po

1998-12-04

1999-11-30

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 54, 264DIG5, 428220, 521 79, 521 81, 521134, 521139, C08J 906, C08J 908, C08J 910, C08J 914

Patent

active

059937076

ABSTRACT:
This invention pertains to a composition and a process for preparing a closed cell alkenyl aromatic polymer foam having enlarged cell size, comprising one or more alkenyl aromatic polymers, one or more substantially random interpolymers, one or more blowing agents having zero ozone depletion potential and optionally one or more co-blowing agents, and optionally, one or more nucleating agents and optionally, one or more other additives.
This combination allows the manufacture of closed cell, low density alkenyl aromatic polymer foams of enlarged cell size, when blowing agents of relatively high nucleation potential are employed. When such blowing agents are used with alkenyl aromatic polymers in the absence of the substantially random interpolymers, small cell foams result.

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