Patent · US Expired

Styrene polymers containing blowing agents

US4772441A · kind A · utility

9Cited by

1References

2Claims

0Family size

Assignee

BASF SE

Inventors

Harro Voss · Ludwigshafen, DE
Klaus Hahn · Lampertheim, DE
Walter Manfred · Speyer, DE
Isidoor DeGrave · Monsheim, DE

Key dates

Filing date	Jun 19, 1987
Grant date	Sep 20, 1988
Priority date	—
Expiry date	Jun 19, 2007

Classification

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

Abstract

Particulate styrene polymers containing blowing agents are prepared by a process in which an aliphatic hydrocarbon of 7 to 9 carbon atoms is added in an amount of from 0.01 to 0.5% by weight, based on the styrene polymer, before, during or after the polymerization. The particulate styrene polymers can be processed to foam blocks and moldings having a satisfactory smooth surface.

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