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US 4,291,135 AGranted
Binders for coating compositions
AssigneeBayer Aktiengesellschaft
InventorsPeter Hohlein, Michael Sonntag
Life of this patent
Estimating the term…
Abstract
Reaction products of alkyd resins and/or oil-free polyesters, (meth) acrylic acid copolymers and polysiloxans are excellent binders for high quality lacquers particularly for surface lacquers used in the motor car industry.
Claims4
Binders for the preparation of coating compositions, obtainable by reacting components A, B and C at 70.degree.-200.degree. C. with elimination of water or alcohol until at least 20% of the theoretically possible quantity of water or alcohol has been eliminated, wherein
- component A is 1-97 parts by weight of copolymer resins which contain, per molecule, at least two functional hydroxyl, carboxyl, alkoxy and/or epoxide groups, which resins are prepared by copolymerization of
- a. 0-50 parts by weight of at least one hydroxyalkyl ester of acrylic or methacrylic acid having 2-4 C-atoms in the hydroxyalkyl group,
- b. 0-60 parts by weight of at least one compound of the group comprising styrene, .alpha.-methylstyrene, o-chlorostyrene, p-chlorostyrene, o-, m- or p-methylstyrene, p-tertiary butyl styrene or methyl methacrylate,
- c. 10-90 parts by weight of at least one acrylic acid ester having 1-12 C atoms in the alcohol group and/or at least one methacrylic acid ester having 2-12 C-atoms in the alcohol group,
- d. 0-30 parts by weight of at least one .alpha.,.beta.-mono-olefinically unsaturated mono- or dicarboxylic acid having 3-5 C-atoms and/or dicarboxylic acid having 3-5 C-atoms and/or at least one maleic acid semi-ester having 2-14 C-atoms in the alcohol group, or reaction products thereof with a monoglycidyl compound,
- e. 0-50 parts by weight of at least one acrylic or methacrylic acid glycidyl ester, or reaction products thereof with aliphatic and/or aromatic monocarboxylic acids and amino compounds,
- f. 0-40 parts by weight of an acrylic or methacrylic acid amide having 1-20 C-atoms in the amino group, or alkoxylated hydroxymethyl acrylic acid amides which may also be produced in situ, and
- g. 0-60 parts by weight of acrylonitrile, with the sum of the parts by weight of reactants (a) through (g) being 100;
- component B is 97-1 parts by weight of alkyd resins and/or oil-free polyesters;
- and
- component C is 0.5-50 parts by weight of at least one polysiloxane having hydroxyl and/or alkoxy groups.
8 more elements
Dependencies are inferred from the claim text.