Aqueous dispersions containing multi-stage emulsion polymers

C - Chemistry – Metallurgy – 08 – F

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C08F 2/22 (2006.01) C08F 2/24 (2006.01)

Patent

CA 2545727

Aqueous dispersions are disclosed, having a minimum film formation temperature no greater than about 50~C, that include a multi-stage emulsion polymer made by a process that includes a first polymerization stage, in which a first monomer mixture having a calculated glass transition temperature of at least about 50~C is polymerized via free radical emulsion polymerization to obtain a first-stage emulsion polymer, and a second polymerization stage, in which a second monomer mixture, having a calculated glass transition temperature from about -30~C to about 10~C, is polymerized via free radical emulsion polymerization, in the presence of the first-stage emulsion polymer. The dispersions are useful in a variety of coating compositions that exhibit improved black resistance.

L'invention concerne des dispersions aqueuses dont la température minimale de formation de film ne dépasse pas environ 50 ·C, ces dispersions comprenant un polymère en émulsion obtenu en plusieurs étapes par un procédé comportant les opérations suivantes : une première polymérisation, où un premier mélange monomère, dont la température de transition vitreuse calculée est d'au moins 50 ·C, est polymérisé par polymérisation radicalaire en émulsion pour former un polymère en émulsion d'une première étape, une deuxième polymérisation, où un deuxième mélange monomère, dont la température de transition vitreuse calculée varie entre environ 30 ·C et environ 10 ·C, est polymérisé par polymérisation radicalaire en émulsion, en présence du polymère en émulsion de la première étape. Ces dispersions servent dans différentes compositions de revêtements présentant une résistance en bloc améliorée.

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