Pigment dispersions containing hydroxylated ab-block polymer...

C - Chemistry – Metallurgy – 09 – D

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C09D 153/00 (2006.01) C08F 293/00 (2006.01) C08L 53/00 (2006.01) C09D 7/02 (2006.01)

Patent

CA 2296521

A pigment dispersion useful for forming coating compositions containing dispersed pigment, a carrier liquid and an AB-block polymer dispersant (binder); the AB block polymer has a number average molecular weight of about 5,000-20,000 and contains 20-80 % by weight of a polymeric A segment and correspondingly 80-20 % by weight of a polymeric B segment; wherein the polymeric A segment of the block polymer is of polymerized glycidyl (meth)acrylate monomers reacted with an acid from the group of aromatic carboxylic acids or aliphatic carboxylic acids; and the B segment is of polymerized alkyl (meth)acrylate monomers having 1-12 carbon atoms in the alkyl group, hydroxy alkyl (meth)acrylate monomers having about 1-4 carbon atoms in the alkyl group; and wherein the weight ratio of pigment to binder in the dispersion is about 1/100 - 200/100.

Cette invention concerne une dispersion de pigment utile pour former des compositions de revêtement contenant un pigment dispersé, un liquide vecteur et un dispersant polymère séquencé AB (liant). Le polymère séquencé AB présente un poids moléculaire moyen en nombre compris entre environ 5.000 et 20.000 et contient entre 20 et 80 % en poids d'un segment polymère A et par suite entre 80 et 20 % en poids d'un segment polymère B. Le segment polymère A du polymère séquencé est constitué de monomères de glycidyle (méth)acrylate polymérisé ayant réagi avec un acide faisant partie du groupe des acides carboxyliques aromatiques ou des acides carboxyliques aliphatiques; et le segment B est constitué de monomères d'alkyle (méth)acrylate polymérisé contenant entre 1 et 12 atomes de carbone dans le groupe alkyle, les monomères d'hydroxyle alkyle méthacrylate contenant environ entre 1 et 4 atomes de carbone dans le groupe alkyle; le rapport en poids entre le pigment et le liant dans la dispersion se situant entre environ 1/100 et 200/100.

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