Method of manufacturing polystyrene foam with polymer processing additives

US9714330B2 · kind B2 · utility

Assignee

• Owens Corning Intellectual Capital, LLC · US

Inventors

• Yadollah Delaviz · Lewis Center, US
• Bharat Patel · Princeton, US
• Mark E. Polasky · Mogadore, US
• Roland R. Loh · Stow, US
• Raymond M. Breindel · Hartville, US
• Mitchell Z. Weekley · Akron, US

Key dates

• Filing date: Mar 7, 2014
• Grant date: Jul 25, 2017
• Expiry date: May 24, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J9/0028
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Disclosed is a method for making polystyrene foam which utilizes one or more atmospheric gases, particularly CO2, as the blowing agent in combination with a polymer processing aid (PPA), typically an ester that is relatively non-volatile at the extrusion temperature range. The blowing agent and the PPA may both be introduced into the molten thermoplastic polystyrene resin or the PPA may be incorporated in the solid source polystyrene resins. The resulting foam will be substantially free of residual blowing agent and dimensionally stable at ambient temperatures.