Patent · US Expired

Powder coating compositions containing copolymers having hydroxyl and carboxylic acid anhydride groups as binders

US5728789A · kind A · utility

2Cited by

9References

8Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Christian Wamprecht · Neuss, DE
Hans-Joachim Kreuder · Krefeld, DE
Armin Zenner · Dormagen, DE
Henning Klussmann · Rommerskirchen, DE

Key dates

Filing date	May 13, 1997
Grant date	Mar 17, 1998
Priority date	—
Expiry date	May 13, 2017

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09D135/00
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to powder coating compositions wherein the binder contains copolymers which are solid below 30.degree. C., prepared from olefinically unsaturated compounds and have a weight-average molecular weight (M.sub.w) of 1500 to 75,000, a content of free hydroxyl groups of 0.2 to 6.0% by weight and a content of intramolecular carboxylic acid anhydride groups (calculated as C.sub.4 H.sub.2 O.sub.3) of 1 to 30% by weight.

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