초록 ▼

In one embodiment, the present invention relates to a process for preparing foam board or sheet including the steps of (A) forming a foamable mixture of (1) a major amount of a styrenic polymer having a high melt index, (2) a minor amount of a low melt index styrenic polymer, and (3) a blowing agent

In one embodiment, the present invention relates to a process for preparing foam board or sheet including the steps of (A) forming a foamable mixture of (1) a major amount of a styrenic polymer having a high melt index, (2) a minor amount of a low melt index styrenic polymer, and (3) 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 a foam product.

대표청구항 ▼

[ What is claimed is:] [1.] A process of preparing a foam product comprising the steps of(A) forming a foamable mixture of (1) a major amount of a polystyrene having a weight average molecular weight of about 50,000 to about 100,000, (2) a minor amount of a polystyrene having a weight average molecu

[ What is claimed is:] [1.] A process of preparing a foam product comprising the steps of(A) forming a foamable mixture of (1) a major amount of a polystyrene having a weight average molecular weight of about 50,000 to about 100,000, (2) a minor amount of a polystyrene having a weight average molecular weight of about 225,000 to about 400,000, and (3) from about 1% to about 16% by weight of the polystyrenes, a blowing agent comprising 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.