Patent · US Expired

Polyisocyanates, a process for their preparation and their use in stoving lacquers

US5071938A · kind A · utility

2Cited by

3References

10Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Reinhard Halpaap · Odenthal, DE
Wilhelm Dunwald · Leverkusen, DE
Holger Casselmann · Odenthal, DE
Hans Schlegel · Minneapolis, US

Key dates

Filing date	Sep 21, 1990
Grant date	Dec 10, 1991
Priority date	—
Expiry date	Sep 21, 2010

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31605
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

This invention relates to polyisocyanates containing PA0 (i) 0.5 to 15% by weight of structural units incorporated by urea groups and corresponding to the formula ##STR1## (ii) 5 to 20% by weight of isocyanate groups (calculated as NCO) reversibly blocked with monofunctional blocking agents for isocyanate groups and PA0 (iii) 0 to 30% by weight of chemically incorporated urethane groups (calculated as NH--CO--O) other than urethane groups present in blocked isocyanate groups. The invention also relates to a process for the preparation of these polyisocyanates and to their use in combination with organic polyhydroxyl compounds as stoving compositions or for the preparation of stoving compositions for heat resistant substrates, in particular wire.

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