Process for the effect coating of grained plastics parts

US5747114A · kind A · utility

Assignee

• Herberts Gesellschaft mit beschrankter Haftung · DE

Inventors

• Helga Stegen · Wuppertal, DE
• Joachim Blum · Remscheid, DE
• Klaus-Günter Kerlin · Haan, DE

Key dates

• Filing date: Sep 18, 1996
• Grant date: May 5, 1998
• Expiry date: Sep 18, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B05D7/02
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A process for the effect coating of polar plastics parts having a grained surface, characterised in that PA1 a) a first coating layer, which is free from effect pigments and modified polyolefines and which comprises a coating medium based on physically drying binder vehicle systems which contain one or more polyurethane resins and/or oligomeric urethanes and which do not chemically crosslink at the temperatures employed in process step f), is applied at a dry coat thickness of 5 to 40 .mu.m, PA1 b) is dried at 20.degree. to 80.degree. C. down to a residual content of 3 to 20% by weight of the volatile fractions which are contained in the applied coating film at the temperature employed, PA1 c) is overcoated wet-into-wet with an effect base lacquer, PA1 d) is dried at 20.degree. to 80.degree. C. down to a residual content of 3 to 20% by weight of the volatile fractions which are contained in the applied coating film at the temperature employed, PA1 e) is overcoated wet-into-wet with a liquid clear lacquer which chemically crosslinks with the formation of covalent bonds at the drying temperatures employed in process step f), and PA1 f) the three coating layers which are obtained are …