US 5,708,117 A · Coating agents and use thereof as primers and/or fillers in the production of multilayer lacquer coatings

Abstract

The description relates to coating agents for use as primers and fillers in the manufacture of multilayer lacquer coatings, more particularly in the motor-vehicle sector. The coating agent contains a binder mixture of A) 60-75 wt. % of a hydroxy-functional copolymer with an OH number of 110 to 170 mg KOH/g, obtainable from a) 5-60 wt. %, preferably 10-30 wt. % of at least one diester of an alpha, beta-olefinically unsaturated dicarboxylic acid with saturated monohydric alcohols containing 1-8 carbon atoms, b) 10-70 wt. %, preferably 35-60 wt. % of one or more vinyl aromatic hydrocarbons, c) 0-30 wt. %, preferably 0-15 wt. % of one or more glycidyl esters of aliphatic saturated monocarboxylic acids branched in the alpha position, d) 25-50 wt. % of at least one hydroxy alkyl ester or a mixture of at least one alkyl ester and one hydroxyl alkyl ester of an alpha, beta-olefinically unsaturated monocarboxylic acid, and e) 0-10 wt. % of one or more alpha, beta-unsaturated monocarboxylic acids, B) 1-6 wt. % of ester-soluble nitrocellulose, C) 0.5-1.8 wt. % calcium oxide and D) 25-35 wt. % of one or more divalent or polyvalent polyisocyanates.

Claims20

Dependent claims

A coating composition comprising:

(A) 60 to 75 weight percent of a hydroxyl-functional copolymer with an OH number of 110 to 170 mg KOH/g prepared by polymerizing
(a) 5 to 60 weight percent of a diester of an alpha, beta-olefinically unsaturated dicarboxylic acid with a saturated alcohol having 1 to 8 carbon atoms;
(b) 10 to 70 weight percent of a vinyl aromatic hydrocarbon;
(c) 0 to 30 weight percent of a glycidyl ester of an aliphatic saturated monocarboxylic acid branched at the alpha position;
(d) 25 to 50 weight percent of a hydroxyl alkyl ester of an alpha, beta-olefinically unsaturated monocarboxylic acid or a mixture of an alkyl ester and an hydroxyl alkyl ester of alpha, beta-olefinically unsaturated monocarboxylic acids;
and
(e) 0 to 10 weight percent of an alpha, beta-unsaturated monocarboxylic acid,
(B) 1 to 6 weight percent of an ester-soluble nitrocellulose,
(C) 0.5 to 1.8 weight percent calcium oxide, and
(D) 25 to 35 weight percent of a polyisocyanate crosslinker;
wherein the coating composition can be applied to a substrate and is curable at relatively low temperatures.

8 more elements

A method of preparing a multilayer lacquer coating on a substrate, said method comprising (1) applying a plurality of layers of a coating composition to the substrate and (2) curing the applied layers at a relatively low temperature, wherein the coating composition comprises:

(A) 60 to 75 weight percent of a hydroxyl-functional copolymer with an OH number of 110 to 170 mg KOH/g prepared by polymerizing
(a) 5 to 60 weight percent of a diester of an alpha, beta-olefinically unsaturated dicarboxylic acid with a saturated alcohol having 1 to 8 carbon atoms;
(b) 10 to 70 weight percent of a vinyl aromatic hydrocarbon;
(c) 0 to 30 weight percent of a glycidyl ester of an aliphatic saturated monocarboxylic acid branched at the alpha position;
(d) 25 to 50 weight percent of a hydroxyl alkyl ester of an alpha, beta-olefinically unsaturated monocarboxylic acid or a mixture of an alkyl ester and an hydroxyl alkyl ester of alpha, beta-olefinically unsaturated monocarboxylic acids;
and
(e) 0 to 10 weight percent of an alpha, beta-unsaturated monocarboxylic acid,
(B) 1 to 6 weight percent of an ester-soluble nitrocellulose,
(C) 0.5 to 1.8 weight percent calcium oxide, and
(D) 25 to 35 weight percent of a polyisocyanate crosslinker.

7 more elements

Dependencies are inferred from the claim text.

Coating agents and use thereof as primers and/or fillers in the production of multilayer lacquer coatings

Life of this patent

Coating agents and use thereof as primers and/or fillers in the production of multilayer lacquer coatings

Life of this patent

Abstract

Claims20