Patent · US Expired

Diisocyanates and diisocyanate mixtures based on diphenylmethane, processes for their production and their use as isocyanate component in the production of polyurethane plastics by the isocyanate polyaddition process

US4761498A · kind A · utility

3Cited by

7References

6Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Hartmut Knofel · Odenthal, DE
Michael Brockelt · Bensberg, DE
Gerhard Wegener · Mettmann, DE

Key dates

Filing date	Mar 20, 1987
Grant date	Aug 2, 1988
Priority date	—
Expiry date	Mar 20, 2007

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/7671
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The instant invention is directed to diisocyanates based on diphenylmethane which may be methyl-substituted and which are characterized in particular by isocyanate groups in the 3,4'- and optionally in the 3,2'-position. The instant invention is also directed to a number of independent processes for their production and to their use as isocyanate component in the production of polyurethanes.

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