Process for producing extruded foam products with higher levels of CO2 as a blowing agent
AssigneeOwens Corning Fiberglas Technology, Inc.
InventorsLarry M. Miller, Raymond M. Breindel, Mitchell Z. Weekley
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Abstract
In one embodiment, the present invention relates to a process for preparing a foam product involving the steps of (A) forming a foamable mixture of (1) a polymer comprising about 10% to about 90% monomers of at least one of meta-substituted styrene and para-substituted styrene and 0% to about 90% monomers of styrene, and (2) a blowing agent containing a major amount of carbon dioxide under a pressure sufficient to prevent prefoaming of the mixture and (B) foaming the mixture into a region of reduced pressure to form the foam product.
Claims13
A process for preparing a foam product comprising the steps of
- (A) forming a foamable mixture comprising a copolymer and a blowing agent;
- said blowing agent consisting of about 10% to about 90% monomers of para-substituted styrene and 0% to about 90% monomers of styrene;
- and said blowing agent consisting of a major amount of carbon dioxide and a lower alcohol under a pressure sufficient to prevent prefoaming of the mixture and
- (B) foaming the mixture into a region of reduced pressure to form the foam product.
A process of preparing a foam product comprising the steps of
- (A) forming a foamable mixture comprising a copolymer and a blowing agent;
- said copolymer consisting of about 1% to about 70% monomers of styrene and about 30% to about 99% monomers of para-methylstyrene;
- and said blowing agent consisting of a major amount of carbon dioxide and a lower alcohol under a pressure sufficient to prevent prefoaming of the mixture and
- (B) foaming the mixture into a region of reduced pressure to form the foam product.
A foam board or sheet comprising a copolymer consisting of styrene and para-substituted styrene wherein the cells of the foam are free of halogen blowing agents.
Dependencies are inferred from the claim text.