Process for the preparation of coatings composed of polyhydroxy compounds
First Claim
1. A coating binder composition, dissolved in solvents which do not contain active hydrogen atoms, composed of a binder (A) comprising a mixture of a copolymer which contains hydroxyl groups and which is a reaction product from mixtures of polymerizable vinyl compounds which contain α
- ,β
-ethylenically unsaturated monocarboxylic acids and styrene and glycidyl esters and (B), polyisocyanate wherein component A consists of 60-80 percent by weight of hydroxyl group containing copolymers, having a total hydroxyl group content of 3.5 to 6.5 percent by weight, prepared in the presence of a mixture of a diacyl peroxide or perester and an alkyl hydroperoxide or dialkyl peroxide as polymerization initiators, from;
(a) 5-24 percent by weight of glycidyl ester of alkanemonocarboxylic acids selected from the group consisting of α
-alkyl-alkanemonocarboxylic acids and α
,α
-dialkylalkanemonocarboxylic acids of the following empirical formula C12-14 H20-26 O3, and slow, uniform addition to said glycidyl esters (a) of(b) 12-30 percent by weight of compounds selected from the group consisting of hydroxyethyl acrylate and hydroxyethyl methacrylate,(c) 1-10 percent by weight of acrylic acid,(d1) 20-50 percent by weight of styrene, and(d2) 5-35 percent by weight of methyl methacrylate,the components a, b, c, d1, and d2, based on 100 percent by weight of components a to d2, and the polymerization and condensation reactions taking place simultaneously and jointly, with the additional condition that components a, b, and c are employed in such quantities that the copolymer component A has a hydroxyl group content of 3.5 to 6.5 percent by weight, and component B consists of 20 to 40 precent by weight of an organic polyisocyanate, it being necessary that components A and B together give a numerical value of 100 percent by weight.
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Abstract
The subject of the invention is a process for the production, by shaping while removing the solvent, of coatings composed of polyhydroxy compounds based on copolymers which contain hydroxyl groups and which are reaction products from mixtures of polymerizable vinyl compounds which contain α, β-ethylenically unsaturated monocarboxylic or dicarboxylic acids and styrene, or derivatives thereof, and of glycidyl esters, as well as polyisocyanates in solvents which do not contain active hydrogen atoms.
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Citations
7 Claims
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1. A coating binder composition, dissolved in solvents which do not contain active hydrogen atoms, composed of a binder (A) comprising a mixture of a copolymer which contains hydroxyl groups and which is a reaction product from mixtures of polymerizable vinyl compounds which contain α
- ,β
-ethylenically unsaturated monocarboxylic acids and styrene and glycidyl esters and (B), polyisocyanate wherein component A consists of 60-80 percent by weight of hydroxyl group containing copolymers, having a total hydroxyl group content of 3.5 to 6.5 percent by weight, prepared in the presence of a mixture of a diacyl peroxide or perester and an alkyl hydroperoxide or dialkyl peroxide as polymerization initiators, from;(a) 5-24 percent by weight of glycidyl ester of alkanemonocarboxylic acids selected from the group consisting of α
-alkyl-alkanemonocarboxylic acids and α
,α
-dialkylalkanemonocarboxylic acids of the following empirical formula C12-14 H20-26 O3, and slow, uniform addition to said glycidyl esters (a) of(b) 12-30 percent by weight of compounds selected from the group consisting of hydroxyethyl acrylate and hydroxyethyl methacrylate, (c) 1-10 percent by weight of acrylic acid, (d1) 20-50 percent by weight of styrene, and (d2) 5-35 percent by weight of methyl methacrylate, the components a, b, c, d1, and d2, based on 100 percent by weight of components a to d2, and the polymerization and condensation reactions taking place simultaneously and jointly, with the additional condition that components a, b, and c are employed in such quantities that the copolymer component A has a hydroxyl group content of 3.5 to 6.5 percent by weight, and component B consists of 20 to 40 precent by weight of an organic polyisocyanate, it being necessary that components A and B together give a numerical value of 100 percent by weight. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification