Hydroxylic acrylate copolymer, process for its preparation, and coating agent based on the acrylate
AssigneeBASF Lacke & Earben AG
InventorsWerner Jung, Christoph Klesse, Axel Sievers
Life of this patent
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Abstract
The invention relates to a hydroxylic acrylate copolymer which contains a proportion of copolymerized monomers having at least 2 double bonds, and to the process for the preparation of the acrylate copolymer. The invention also relates to coating agents which contain acid-curable binders, organic solvents and, if appropriate, pigments, fillers and conventional assistants and additives and which contain, as the essential binder, the hydroxylic acrylate copolymer and an alkylated melamine/formaldehyde resin. The invention also relates to coating agents which, as the essential binders, contain the hydroxylic acrylate copolymer in one or more different polyfunctional isocyanates.
Claims11
A coating composition comprising:
- A) from about 55 to about 90% by weight of a precrosslinked hydroxylic acrylate copolymer comprising the reaction product of:
- a.sup.1) from 10 to 60% by weight of at least one hydroxylic alkyl ester selected from the group consisting of hydroxyalkyl acrylic acid esters and hydroxyalkyl methacrylic acid esters having between 2 and 14 carbon atoms in the alkyl chain:
- a.sup.2) from 3 to 25% by weight of at least one monomer having at least two polymerizable olefinically unsaturated bonds;
- a.sup.3) from 15 to 82% by weight of at least one polymerizable monomer having one olefinically unsaturated bond, the sum of components a.sup.1, a.sup.2, and a.sup.3 being 100% of said copolymer, and wherein said copolymer is ungelled;
- and
- B) from about 10 to 45% by weight of a cross-linking agent, the sum of A) and B) being 100% by weight of said coating composition.
A coating composition comprising:
- A) a pre-crosslinked hydroxylic acrylate copolymer comprising the reaction product of:
- a.sup.1) from 10 to 60% by weight of at least one hydroxylic alkyl ester selected from the group consisting of hydroxyalkyl acrylic acid esters and hydroxyalkyl methacrylic acid esters having between 2 and 14 carbon atoms in the alkyl chain;
- a.sup.2) from 3 to 25% by weight of at least one monomer having at least two polymerizable olefinically unsaturated bonds;
- a.sup.3) from 15 to 82% by weight of at least one polymerizable monomer having one olefinically unsaturated bond, the sum of components a.sup.1, a.sup.2, and a.sup.3 being 100% of said copolymer;
- and
- B) at least one polyfunctional isocyanate, the ratio of isocyanate groups in said polyfunctional isocyanate to hydroxyl groups in said pre-crosslinked acrylate copolymer being within the range of about 0.3:1 to about 3.5:1.
Dependencies are inferred from the claim text.