Curable coating composition with improved stability

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 151/06 (2006.01) C08F 2/22 (2006.01) C08F 291/00 (2006.01)

Patent

CA 2408872

The present invention provides a coating composition containing a two-stage polymer emulsion. The two-stage emulsion polymer contains composite polymeric particles of a first stage polymer prepared from about 0.25% to about 5% by weight monomer having at least two polymerizable ethylenically unsaturated groups, about 2.5% to about 10% by weight hydroxyl monomer, preferably at least about 50% by weight of non-functional monomer of hydrophobic monomer, and preferably without addition of any acid-functional monomer; and a second stage polymer having a theoretical glass transition temperature at least about 50~C prepared using, by weight, about 25% to about 50% by weight hydroxyl monomer, about 3% to about 9% carboxylic acid monomer, preferably at least 25% by weight of non-functional monomer of hydrophobic monomer;. The composite polymeric particles have a theoretical glass transition temperature of not more than about 30~C, preferably not more than about 0~C, and include from about 0.8% to about 2% by weight of carboxylic acid monomer.

L'invention concerne une composition de revêtement renfermant une émulsion polymère à deux phases, émulsion qui contient des particules polymères composites d'un polymère de première phase préparé à partir de 0,25 % à 5 % en poids environ d'un monomère ayant au moins deux groupes éthyléniquement insaturés polymérisables, de 2,5 % à 10 % en poids environ d'un monomère hydroxyle, de préférence d'au moins 50 % en poids d'un monomère non fonctionnel de monomère hydrophobe et, de préférence, sans adjonction d'aucun monomère à fonction acide; et d'un polymère de seconde phase ayant une température de transition vitreuse théorique d'au moins 50 ·C, préparé à l'aide de 25 % à 50 % en poids environ de monomère hydroxyle, de 3 % à 9 % environ de monomère d'acide carboxylique et, de préférence, d'au moins 25 % en poids d'un monomère non fonctionnel de monomère hydrophobe. Les particules polymères composites ont une température de transition vitreuse n'excédant pas environ 30 ·C, de préférence environ 0 ·C, et comportent entre 0,8 % et 2 % en poids environ de monomère d'acide carboxylique.

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