Utilization of water-dilutable condensation resin as...

C - Chemistry – Metallurgy – 09 – C

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C09C 3/10 (2006.01) C08K 3/00 (2006.01) C08K 5/10 (2006.01) C09D 7/12 (2006.01) C09D 133/00 (2006.01) C09D 169/00 (2006.01)

Patent

CA 2532643

The invention relates to the utilization of water-dilutable condensation resin AB as dispersing agent for pigments, wherein the condensation resins have an acid value ranging from 20 mg/g to 180 mg/g and are obtained by condensation of component A containing acid groups with an acid value ranging from 30 mg/g to 240 mg/g, which are selected from amongst the group consisting of copolymers of olefinically unsaturated monomers and by dimerization or oligomerization of compounds obtained from unsaturated aliphatic carboxylic acids and polyesters B containing hydroxyl groups with a hydroxyl value ranging from 20 mg/g to 300 mg/g and a number-average molar mass Mn ranging from 500 g/mol to 5000 g/mol. The mass proportion of components A in the reaction mixture for the synthesis of the condensation resin AB amounts to 30 % to 90 % and that of component B amounts to 70 % to 10 %, with the proviso that the sum of the mass proportions of both components always amounts to 100 %.

L'invention concerne l'utilisation de résines de condensation (AB) pouvant être diluées à l'eau en tant qu'agent dispersant destiné à des pigments. Lesdites résines de condensation présentent un indice d'acidité de 20 mg/g à 180 mg/g et peuvent être obtenues par condensation de composants (A) contenant des groupes acides, présentant un indice d'acidité de 30 mg/g à 240 mg/g, choisis parmi des copolymérisats de monomères à insaturation oléfinique, et dimérisation ou oligomérisation de composés provenant d'une part d'acides carboxyliques aliphatiques insaturés et d'autre part de polyesters (B) contenant des groupes hydroxyl, présentant un indice hydroxyl de 20 mg/g à 300 mg/g et un poids molaire moyen en nombre M¿n ?de 500 g/mol à 5000 g/mol. Par ailleurs, la part en poids du composant (A) dans le mélange de réaction destiné à la synthèse des résines de condensation (AB) est de 30 % à 90 %, et celle du composant (B) est de 70 % à 10 %, la somme des parts en poids des deux composants étant toujours égale à 100 %.

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