Process for the production of a firmly adhering, moisture-proof coating of plastic on a substrate

US5618372A · kind A · utility

Assignee

• HERAEUS KULZER GMBH · DE

Inventors

• Albert Erdrich · Bad Nauheim, DE
• Sonja Fremdt · Weinbach, DE
• Steffen Oppawsky · Bad Homburg vor der Höhe, DE

Key dates

• Filing date: Nov 15, 1995
• Grant date: Apr 8, 1997
• Expiry date: Nov 15, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D4/06
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A process for the production of a firmly adhering, moisture-proof coating of plastic on a substrate of metal, ceramic, glass, or polymer by the application of a liquid preparation containing water, solvent, a (meth)acrylate, and a reactive polymer and by solidifying this coating by heating it to a temperature above 100.degree. C. is described. A first preparation is applied to the substrate and at least partially dried; a second preparation is then applied to the partially dried first preparation and at least partially dried. Then the coating is heated to a temperature in the range of 150.degree.-400.degree. C. to solidify it. The first preparation contains: PA1 5-25 wt. % of an aqueous copolymer suspension, the copolymer consisting of a mixture of 40-80 wt. % of acrylonitrile and 60-20 wt. % of butyl acrylate; PA1 5-20 wt. % of water; PA1 35-75 wt. % of a polar solvent; and PA1 3-15 wt. % of a (meth)acrylate which is nonvolatile at temperatures of up to 250.degree. C., with the provision that the percentages always add up to 100%; and the second preparation contains: PA1 5-20 wt. % of a 40-90 wt. % solution of an isocyanate group-free polyurethane baking resin in solvent naphtha 1…