US 2003/0170397 A1 · Curable coating compositions having improved compatibility and scratch and mar resistance, cured coated substrates made therewith and methods for obtaining the same

Abstract

The invention provides curable coating compositions which have improved compatability with other coating compositions and which provide improved scratch and mar resistance. The compositions comprise a film-forming component (A), a catalyst (B) for the film-forming reaction comprising one or more strong acids having a pKa of 2.5 or less, and a volatile catalyst carrier (C) comprising one or more tertiary amines having a boiling point of 100 degrees C. The film-forming component (A) comprises one or more crosslinking agents (b) at least one of which is an aminoplast curing agent (bi) having from 0.5 to 3.5 moles of NH per mole of aminoplast curing agent (bi). The invention also provides a method of making thermally cured films having improved scratch and mar as well as a method of making multilayer-cured films.

Claims27

Dependent claims

A method of obtaining a thermally cured film having improved scratch and mar resistance, the method comprising

applying a coating composition to a substrate to provide a coated substrate, said coating composition comprising
(A) a film-forming component comprising
(a) one or more active hydrogen containing compounds, and
(b) one or more crosslinking agents, comprising at least one aminoplast curing agent (bi) having from 0.5 to 3.5 moles of NH per mole of aminoplast curing agent (bi),
(B) a catalyst for the reaction between (Aa) and (Ab) comprising one or more strong acids having a pKa equal to or less than 2.5, and
(C) a volatile catalyst carrier comprising of one or more tertiary amines having a boiling point of 100 degrees C., and
thermally curing the coated substrate to provide a cured film on the substrate, the interaction of film-forming component (A), nonvolatile catalyst (B), and volatile catalyst carrier (C) being such that the uppermost 10% of the cured film has an average crosslink density which is greater than an average crosslink density of the lowermost 50% of the cured film.

4 more elements

Dependencies are inferred from the claim text.

Curable coating compositions having improved compatibility and scratch and mar resistance, cured coated substrates made therewith and methods for obtaining the same

Life of this patent

Curable coating compositions having improved compatibility and scratch and mar resistance, cured coated substrates made therewith and methods for obtaining the same

Life of this patent

Abstract

Claims27