Patent · US Expired

Production of closed-celled foams of high compressive strength

US4840976A · kind A · utility

5Cited by

6References

1Claims

0Family size

Assignee

BASF SE

Inventors

Reinhold Weber · Biberach an der Riß, DE
Ludwig Zuern
Manfred Weilbacher · Bischofswerda, DE

Key dates

Filing date	Jul 8, 1988
Grant date	Jun 20, 1989
Priority date	—
Expiry date	Jul 8, 2008

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S521/91
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Closed-celled foams of high compressive strength are obtained by extruding a mixture of a styrene polymer and from 8 to 16% by weight of a blowing agent mixture containing from 2 to 20% by weight of ethyl chloride, from 2 to 20% by weight of carbon dioxide, from 20 to 80% by weight of dichlorodifluoromethane and from 10 to 60% by weight of monochlorodifluoromethane.

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