Copolymers which contain hydroxyl groups and a method of...

C - Chemistry – Metallurgy – 08 – F

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C08F 220/26 (2006.01) C08F 218/04 (2006.01) C08F 220/28 (2006.01) C08F 220/32 (2006.01) C08G 18/62 (2006.01) C09D 133/14 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2228976

This invention relates to copolymers which contain hydroxyl groups and which arebased on vinyl esters of monocarboxylic acids, wherein the copolymers which contain hydroxyl groups have an OH number of 110 - 170 mg KOH/g, an acid number of 5-35 mg KOH/g and a number average molecular weight Mn of 1500 - 8000 g/mole andare obtainable by the polymerisation of A) 5 - 20 % by weight of one or more vinyl esters of saturated monocarboxylic acids, B) 10 - 30 % by weight of one or more aromatic vinyl hydrocarbons, C) 41 - 55 % by weight of hydroxy-functional, polymerisable, unsaturated monomers, and D) 0 - 40 % by weight of further polymerisable, unsaturated monomers, wherein component C) contains C1) 40 - 70 %by weight of one or more hydroxyalkyl esters of .alpha.,.beta.-unsaturated monocarboxylic acids, C2) 1 - 10 % by weight of one or more lactones, and C3) 30 - 55 % by weight of one or more reaction products of an .alpha.,.beta.-unsaturated monocarboxylic acid with a glycidyl ester of a saturated .alpha.,.alpha.-dialkylalkane-monocarboxylic acid or of a saturated .alpha.-alkylalkane-monocarboxylic acid, and the sum of components A) to D) and the sum of components C1) to C3) add up to 100 % by weight in each case. The invention further relates to a method of producing said copolymers which contain hydroxyl groups, and also relates to coating media in which said copolymers which containhydroxyl groups are used.

La présente invention concerne des copolymères portant des groupes hydroxyle et qui sont fondés sur des esters vinyliques d'acides monocarboxyliques, lesquels copolymères portant des groupes hydroxyle possèdent un indice OH de 110 - 170 mg KOH/g, un indice d'acide de 5-35 mg KOH/g et un poids moléculaire numérique moyen, Mn, de 1 500 - 8 000 g/mole; on peut obtenir ces copolymères par la polymérisation de A) 5 - 20 % en poids d'un ou de plusieurs esters vinyliques d'acides monocarboxyliques saturés, B) 10 - 30 % en poids d'un ou de plusieurs hydrocarbures vinyliques aromatiques, C) 41 - 55 % en poids de monomères à fonction hydroxy, polymérisables, insaturés, et D) 0 - 40 % en poids d'autres monomères polymérisables, insaturés, où le constituant C) contient C1) 40 - 70 % en poids d'un ou de plusieurs esters hydroxyalkyliques d'acides monocarboxyliques alpha,bêta-insaturés, C2) 1 - 10 % en poids d'une ou de plusieurs lactones et C3) 30 - 55 % en poids d'un ou de plusieurs produits de réactions d'un acide monocarboxylique alpha,bêta-insaturé avec un ester glycidylique d'un acide alpha,alpha-dialkylalcane-monocarboxylique saturé ou d'un acide alpha-alkylalcane-monocarboxylique saturé, et la somme des constituants A) à D) et la somme des constituants C1) à C3) correspondent à 100 % en poids dans tous les cas. L'invention concerne également une méthode de production desdits copolymères portant des groupes hydroxyle ainsi que des milieux de revêtement dans lesquels lesdits copolymères portant des groupes hydroxyle sont utilisés.

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