Patent · US Expired

Process for the production of hard polyurethane foams

US5602190A · kind A · utility

8Cited by

6References

8Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Wilhelm Lamberts · Cologne, DE
Norbert Eisen · Hanerau-Hademarschen, DE
James A. Thompson-Colón · Celaya, MX

Key dates

Filing date	Jan 27, 1995
Grant date	Feb 11, 1997
Priority date	—
Expiry date	Jan 27, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2375/04
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Rigid polyurethane foams are prepared by the reaction of 1) polyisocyanates with 2) compounds of a molecular weight of from 150 to 1500, having at least two hydrogen atoms active towards isocyanates and which one tertiary nitrogen atom in the molecule, in the presence of 3) hydrofluoroalkanes as foaming agents as well as optionally in the presence of 4) other auxiliary substances and additives known per se.

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