Carboxy resin crosslinkers
AssigneeBASF SE
InventorSunitha Grandhee
Life of this patent
Estimating the term…
Abstract
Carboxy resins of low equivalent weight per carboxyl group are synthesized by reacting a compound having two or more isocyanate groups with a compound having one hydroxyl group and two or more carboxyl groups. In a preferred embodiment, the compound having isocyanate groups is an isocyanurate derivative of a diisocyanate. The compound having isocyanate groups and the compound having one hydroxyl group and two or more carboxyl groups are reacted under conditions where reaction of carboxyl groups with isocyanate is substantially avoided. In another aspect of the invention, coating compositions are provided that contain in addition to the carboxy resin, a second component having a number of functional groups that are reactive with the carboxyl groups on the carboxy resin.
Claims43
A coating composition comprising:
- (A) a carboxyl functional component that is an optionally partially neutralized reaction product of
- (1) a polyisocyanate having two or more isocyanate groups, and
- (2) a reactive compound having two or more carboxyl groups, and one functional group selected from the group consisting of hydroxyl, amino, and mercaptan;
- and
- (B) a component comprising a plurality of groups that are reactive with the carboxyl groups on the carboxyl functional component, wherein the reactive groups are selected from the groups consisting of oxazoline groups and oxazine groups.
A coating composition, comprising an alkyd component that is the reaction product of:
- (A) a carboxyl functional component that is an optionally partially neutralized reaction product of
- (1) a polyisocyanate having two or more isocyanate groups, and
- (2) a reactive compound having two or more carboxyl groups, and one functional group selected from the group consisting of hydroxyl, amino, and mercaptan;
- and
- (B) a component comprising one epoxy group.
A coating composition, comprising:
- a carboxyl-functional component comprising urethane groups, and having an equivalent weight per carboxyl group of 200 or less;
- and
- a second component comprising a plurality of functional groups selected from the group consisting of oxazine groups and oxazoline groups.
A paint composition comprising:
- (A) a carboxy resin having carboxyl functional groups and an equivalent weight per carboxyl group of 200 or less;
- (B) at least one component comprising a plurality of functional groups selected from the group consisting of oxazine and oxazoline groups;
- and
- (C) a pigment.
Dependencies are inferred from the claim text.