Coating agent with high scratch resistance and weathering resistance
AssigneeBASF Coatings GmbH
InventorsMatthijs Groenewolt, Sebastian Frerick
Life of this patent
Estimating the term…
Abstract
The present invention relates to a coating composition comprising (d) at least one binder (A) having reactive groups, (e) at least one crosslinking agent (B) which is able to react, with crosslinking with the reactive groups of the binder (A), and at least one catalyst (C) for the crosslinking of silane groups, one or more constituents (A) and/or (B) and/or at least one further constituent of the coating composition containing hydrolyzable silane groups, wherein the catalyst (C) is a phosphoric acid compound, more particularly phosphoric acid or phosphonic acid, which is blocked with an amine having a pKb≧3 and a boiling point >100° C.
Claims19
A coating composition comprising
- (a) at least one binder (A) having reactive groups,
- (b) at least one crosslinking agent (B) which reacts, with crosslinking with the reactive groups of the binder (A), and
- (c) at least one catalyst (C) for the crosslinking of silane groups, the catalyst (C) comprising at least one member selected from the group consisting of a phosphoric acid compound and a phosphonic acid compound, said member being blocked with a bicyclic amine,
- wherein one or more constituents of the coating composition contain hydrolyzable silane groups.
A multistage coating method, the method comprising
- applying a pigmented film to an uncoated or precoated substrate, and
- thereafter applying a film of a coating composition comprising
- (a) at least one binder (A) having reactive groups,
- (b) at least one crosslinking agent (B) which reacts, with crosslinking with the reactive groups of the binder (A), and
- (c) at least one catalyst (C) for the crosslinking of silane groups, the catalyst (C) comprising a phosphoric acid compound that is blocked with a bicyclic amine,
- wherein one or more constituents of the coating composition contain hydrolyzable silane groups.
A coating composition comprising
- (a) at least one binder comprising at least one hydroxyl-containing compound (A),
- (b) at least one crosslinking agent (B) having free and/or blocked isocyanate groups which is able to react, with crosslinking with the reactive groups of the binder (A), and
- (c) at least one catalyst (C) for the crosslinking of silane groups, one or more constituents (A), and/or (B) and/or at least one further constituent of the coating composition containing hydrolyzable silane groups, wherein the catalyst (C) is a phosphoric acid or phosphonic acid which is blocked with an bicyclic amine having a pKb ≧3 and a boiling point >100° C. compound.
Dependencies are inferred from the claim text.