Coating agents based on hydroxyl-containing polycondensation and polyaddition products and their use

US5326820A · kind A · utility

Assignee

• Basf Lacke & Farben Aktiengesellschaft · DE

Inventors

• Peter Hoffmann · Senden, DE
• Werner-Alfons Jung · Ascheberg, DE
• Michael Brunnemann · Munster, DE

Key dates

• Filing date: Mar 15, 1993
• Grant date: Jul 5, 1994
• Expiry date: Mar 15, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D151/08
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to coating agents based on hydroxyl-containing binders and isocyanate-containing crosslinking agents, in which coating agents PA1 I.) the binder comprises PA2 A1) 5 to 80% by weight of at least one polyester or one alkyd resin having an OH number from 0 to 200 mg of KOH/g and an acid number from 0 to 200 mg of KOH/g, PA2 A2) 95 to 20% by weight of at least one polyacrylate having an OH number from 30 to 250 mg of KOH/g and an acid number from 0 to 50 mg of KOH/g, PA1 the sum of the weight proportions of components (A1) and (A2) being in each case 100% by weight, and PA1 II.) the binder is obtainable from PA2 1.) at least one polycondensation resin whose acid component comprises 5 to 100 mol % of cycloaliphatic polycarboxylic acids and/or esterifiable derivatives thereof, PA2 2.) at least one polyacrylate, at least some of which has been prepared in the presence of the polycondensation resin obtained in the first process step and PA2 3.) if desired, at least one further Polyaddition and/or one further Polycondensation resin.