Patent · US Expired

Process for the preparation of composite bodies

US5445879A · kind A · utility

1Cited by

2References

5Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Ulrich Liman · Monheim, DE
Dirk Wegener · Bielefeld, DE
Hartwig Grammes · Leverkusen, DE

Key dates

Filing date	Dec 1, 1994
Grant date	Aug 29, 1995
Priority date	—
Expiry date	Dec 1, 2014

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/249991
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention is directed to an improved process for the preparation of composite bodies by back-foaming plastics sheets with a polyurethane reaction mixture. The improvement is in using certain hydroxycarboxylic acids present in the alkali salt form as the catalyst.

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