Cross-linkable polymer composition

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 151/00 (2006.01) C08F 265/04 (2006.01) C08F 290/04 (2006.01) C08L 51/00 (2006.01)

Patent

CA 2465715

The invention pertains to a polymer obtainable from the steps: - polymerizing a mixture, that is substantially free or organic solvents, of ethylenically unsaturated monomers which consist for at least 70% of methacrylates, and which comprises specific chain transfer agents, .alpha.-methylstyrene dimer being preferred, to form a first polymer, - aqueous emulsion polymerizing a mixture comprising ethylenically unsaturated monomers in the presence of the first polymer to form a dispersion of a water-insoluble second polymer, wherein these steps are preferably performed in the absence or the substantial absence of a surfactant.

L'invention concerne un polymère obtenu aux stades suivants: - polymérisation d'un mélange sensiblement exempt de solvants organiques, de monomères insaturés en éthylène, qui consiste pour au mois 70 % de méthacrylates, et qui comprend des agents de transfert de chaîne spécifiques, avec une préférence pour un dimère de .alpha.-méthylstyrène, pour former un premier polymère; - polymérisation par émulsion aqueuse d'un mélange comprenant des monomères insaturés en éthylène en présence du premier polymère pour former une dispersion d'un deuxième polymère non soluble dans l'eau, ces stades étant de préférence effectués en absence ou sensiblement en absence d'un surfactant.

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