Powder coating compositions
AssigneeInternational Coatings Limited
InventorsJanice Greta Robinson, Michael Wittig
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Abstract
Powder coating compositions comprise a film-forming polymer, a pigment providing a metallic effect, and a stabilizing additive which, in a coating formed from the composition on a substrate, inhibits degradation of the metallic pigment in the presence of oxygen and water.
Claims54
A powder coating composition which comprises a film-forming polymer, a pigment providing a metallic effect, and a stabilising additive which, in a coating formed from the composition on a substrate, inhibits degradation of the metallic pigment in the presence of oxygen and water, wherein the stabilising additive comprises at least one silicate material selected from the group consisting of:
- (a) materials obtained by admixture or reaction of silica or a silicate with a compound of a trivalent metal;
- and (b) naturally occurring or synthetic metal silicates, wherein the stabilising additive, or a silica or silicate used in embodiment (a), is surface-modified by ion exchange.
A powder coating composition which comprises a film-forming polymer, a pigment providing a metallic effect, and a stabilising additive which, in a coating formed from the composition on a substrate, inhibits degradation of the metallic pigment in the presence of oxygen and water, wherein at least part of the stabilising additive is incorporated by post-blending.
A method for preparing a powder coating composition comprising the steps of combining a film-forming polymer;
- a pigment providing a metallic effect;
- and a stabilising additive, wherein:
- (a) in a coating formed from the composition on a substrate, the composition inhibits degradation of the metallic pigment in the presence of oxygen and water;
- and
- (b) the stabilising additive comprises at least one silicate material selected from the group consisting of:
- (i) materials obtained by admixture or reaction of silica or a silicate with a compound of a trivalent metal;
- and (ii) naturally occurring or synthetic metal silicates, wherein the stabilising additive, or a silica or silicate used in embodiment (i), is surface-modified by ion exchange.
A method for preparing a powder coating composition comprising the steps of (a) combining a film-forming polymer and a pigment providing a metallic effect;
- and (b) adding a stabilising additive by post-blending, wherein in a coating formed from the composition on a substrate, the composition inhibits degradation of the metallic pigment in the presence of oxygen and water.
Dependencies are inferred from the claim text.