Patent · US Expired

Mixed blocked isocyanate prepolymers, a process for their production and their use for the production of flexible epoxy resin systems

US5510432A · kind A · utility

10Cited by

9References

6Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Lutz Schmalstieg · Neunburg vorm Wald, DE
Rainer Rettig · Amagasaki, JP
Eberhard Konig · Kronberg, DE

Key dates

Filing date	May 31, 1995
Grant date	Apr 23, 1996
Priority date	—
Expiry date	May 31, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L75/08
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Isocyanate prepolymers based on an aromatic diisocyanate and a polyether polyol in which at least 95% of the isocyanate groups are blocked by blocking agents selected from PA1 A) about 50 to about 97 equivalent % of a phenol or substituted phenol, PA1 B) about 30 to about 50 equivalent % of a pyrazole or a substituted pyrazole and PA1 C) 0 to about 10 equivalent % of a blocking agent different from A) and B). These blocked isocyanate prepolymers are particularly useful for the production of flexible epoxy resin systems.

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