Patent · US Active

Method of manufacturing polystyrene foam with polymer processing additives

US8119701B2 · kind B2 · utility

4Cited by

19References

23Claims

0Family size

Assignee

Owens Corning Intellectual Capital, LLC · US

Inventors

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

Key dates

Filing date	Oct 24, 2005
Grant date	Feb 21, 2012
Priority date	—
Expiry date	Jul 14, 2027

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2203/142
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Disclosed is a method for making polystyrene foam which utilizes one or more atmospheric gases, particularly combinations of HFCs and CO2, as the blowing system in combination with a polymer processing aid (PPA), typically an ester that is relatively non-volatile at the extrusion temperature range. The blowing system 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 foams will typically exhibit improved dimensional stability at ambient temperatures.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.