Patent · US Expired

Liquid, light-colored polyisocyanate mixtures and a process for their production

US5426126A · kind A · utility

4Cited by

3References

7Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Herbert Gebauer · Krefeld, DE
Pramod Gupta · Bedburg, DE
Martin Hoppe · Hamm, DE
Rolf Wiedermann · Bensberg, DE

Key dates

Filing date	Dec 30, 1992
Grant date	Jun 20, 1995
Priority date	—
Expiry date	Dec 30, 2012

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G2110/0025
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

An isocyanate terminated prepolymer based upon diphenylmethane isocyanates. This prepolymer is the reaction product of a diphenylmethane isocyanate mixture having from about 75 to about 95 wt % binuclear isomers and from about 5 to about 25 wt % polymeric isocyanate with a polyether polyol. The binuclear isomer content is generally from about 15 to about 40 wt % 2,4'-isomer and from about 2 to about 10 wt % 2,2'-isomer. The polyether polyol has a functionality of from about 3 to about 8, an OH number of from about 350 to about 1000 mg KOH/g and a molecular weight of from about 150 to about 1000. These prepolymers are particularly useful as starting materials for the production of light-colored, dimensionally stable rigid polyurethane foams.

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