One component waterborne coating with improved chemical...

C - Chemistry – Metallurgy – 09 – D

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C09D 125/08 (2006.01) C08J 7/04 (2006.01) C09D 125/14 (2006.01) C09D 133/06 (2006.01) C09D 133/08 (2006.01) C09D 175/04 (2006.01) C08L 33/06 (2006.01) C08L 51/08 (2006.01)

Patent

CA 2243238

A coating composition particularly suitable for coating poly(phenylene oxide) comprises aqueous medium-dispersed particles of: A) between about 30 and about 35 wt%, of a first styrene-acrylic polymer formed of monomers, between about 50 and about 80 mole% of which monomers are styrene or substituted styrene monomers, between about 2 and about 15 mole percent of which monomers are acrylonitrile, and between about 18 and about 48 mole percent of which are acrylic monomers, said first styrene-acrylic polymer having an acid number of about 15 or below; B) between about 30 and 35 wt%, of an acrylic second polymer formed of monomers, at least about 90 mole percent of which monomers are acrylate monomers, balance other .alpha.,.beta.-ethylenically unsaturated monomers, said acrylic second polymer having an acid number between 0 and about 25; and C) between about 30 and about 40 wt% of an acrylic-urethane hybrid polymer.

Divulgation d'une composition de revêtement particulièrement utile pour le revêtement de poly(phénylène-oxyde), comprenant des particules dispersées dans un milieu aqueux. Ces particules sont constituées : A) d'environ 30 à environ 35 %, en poids, d'un premier polymère styrène/acrylique formé de monomères dont environ 50 à environ 80 %, en mole, sont des monomères de styrène ou de styrène substitué, dont environ 2 à environ 15 %, en mole, sont des monomères d'acrylonitrile, et dont environ 18 à environ 48 %, en mole, sont des monomères acryliques, ce premier polymère styrène/acrylique ayant un indice d'acide d'environ 15 ou moins; B) d'environ 30 à environ 35 %, en poids, d'un second polymère acrylique dont au moins 90 %, en mole, des motifs sont des acrylates monomères, et dont le reste est constitué de monomères .alpha. ou .bêta.éthyléniques, ce deuxième polymère acrylique ayant un indice d'acide allant de 0 à environ 25; et C) d'environ 30 à environ 40 %, en poids, d'un polymère hybride acrylique-uréthane.

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