UV-curable scratch-resistant varnish having a thickener which becomes bound in the composition of the varnish by polymerization

US5700576A · kind A · utility

Assignee

• Roehm GmbH Chemische Fabrik · DE

Inventors

• Manfred Brehm · Aschaffenburg, DE
• Rolf Neeb · Pfungstadt, DE
• Wolfgang Scharnke · Darmstadt, DE
• Volker Kerscher · Reinheim, DE

Key dates

• Filing date: Mar 4, 1996
• Grant date: Dec 23, 1997
• Expiry date: Mar 4, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31909
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A coating agent for producing scratch-resistant coatings on plastic articles, which comprises: PA1 (1) 1-30 wt. % of a prepolymer, as a thickener (IP thickener), which prepolymer is bound in the composition of the coating by polymerization; PA1 (2) 20-80 wt. % of multifunctional acrylates, multifunctional methacrylates or mixtures thereof; PA1 (3) 5-75 wt. % of a thinner; PA1 (4) 0.01-10 wt. % of a UV-initiator; PA1 (5) 0-20 wt. % of customary additives; wherein the prepolymer (1) is obtained by radical polymerization of: PA1 (a) 90-99 wt. % of C.sub.1 -C.sub.8 -alkyl esters of acrylic- or methacrylic acid; and PA1 (b) 1-10 wt. % of a sulfur-containing regulator having at least three thiol groups. The coating system is distinguished by high scratch-resistance and good weatherability.