Patent · US Expired

Method for the preparation of polyurethane foams

US4837244A · kind A · utility

3Cited by

0References

8Claims

0Family size

Assignee

Th. Goldschmidt. AG · DE

Inventors

Georg Burkhart · Essen, DE
Volker Moring · Wiesloch, DE
Dietmar Schaefer · Hattingen, DE

Key dates

Filing date	Jul 11, 1988
Grant date	Jun 6, 1989
Priority date	—
Expiry date	Jul 11, 2008

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2471/00
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A method for the preparation of rigid polyurethane and/or polyisocyanurate foams is disclosed. The foams are prepared from a mixture comprising at least difunctional polyisocyanates, compounds with at least two hydrogen atoms that are capable of reacting with isocyanates, the equivalent weight of which per reactive hydrogen atom is about 50 to 900, catalysts, blowing agents and foam stabilizers, devoid of silicon atoms, as well as, optionally, conventional additives such as flame retardants and chain extenders. The foam stabilizer is a polyoxyalkylene ether of an alkylphenol-aldehyde condensation product, the alkyl group(s) of the alkylphenol having 1 to 22 carbon atoms, the aldehyde having 1 to 18 carbon atoms, the condensation product comprising on the average 4 to 18 alkylphenol groups, the oxyalkylene units having 2 to 4 carbon atoms and the content of oxyalkylene groups being 15 to 85% by weight, based on the total weight.

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