Patent · US Expired

Process for preparing urethanes containing (meth)-acryloyl groups as binders for powder coatings

US6569944B2 · kind B2 · utility

3Cited by

3References

6Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Jan Weikard · Neunburg vorm Wald, DE
Christian Zwiener · Cologne, DE
Wolfgang Fischer · Meerbusch, DE
Peter Thometzek · Bensberg, DE

Key dates

Filing date	Mar 16, 2001
Grant date	May 27, 2003
Priority date	—
Expiry date	Jun 22, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31605
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to a process for preparing urethanes containing (meth)acryloyl groups that are suitable as binders for powder coatings by reacting a polyisocyanate component with a hydroxyl group-containing component that contains at least one compound additionally containing (meth)acryloyl groups in a melt of compounds containing (meth)acryloyl groups, which are crystalline in the solid state and have a melting point of 30 to 100° C. and a dynamic viscosity at 111° C. of less than 10 Pa·s, at elevated temperature until the NCO content has dropped below 0.5 wt. %. The present invention also relates to the use of these urethanes as binders for powder coating compositions for coating substrates made of wood, metal, plastics or mineral substances, which may have been primed.

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