Process for producing alkenyl aromatic foams using a combination of atmospheric and organic gases and foams produced thereby

USRE38993E1 · kind E1 · reissue

Assignees

• REEDY INTERNATIONAL CORPORATION · US
• Genpak, LLC · US

Inventors

• Michael E. Reedy · Keyport, US
• Edward W. Rider, Jr. · Slate Hill, US

Key dates

• Filing date: Oct 3, 2000
• Grant date: Feb 28, 2006
• Expiry date: Oct 3, 2020

Classification

• Technology area (CPC —): General

Abstract

There is disclosed a process for producing alkenyl aromatic foams utilizing a combination of atmospheric and organic gases as blowing agent, preferably using greater than 30% by weight of atmospheric gas, and preferably also using a predetermined about of a masterbatch mix comprising a styrenic polymer, a rubbery block copolymer, and a solid blowing agent. Also disclosed are alkenyl aromatic foams produced by the process which exhibit increased densities, increased thermoforming capabilities, increased post-expansion properties, and increased retainment of the atmospheric and organic gases.