Emulsion polymerisation

Details Emulsion polymerisation Emulsion polymerisation

C - Chemistry, Metallurgy

09

J

C09J 131/02 (2006.01) C08F 210/00 (2006.01) C08F 218/04 (2006.01) C09J 123/02 (2006.01) C08F 218/08 (2006.01)

Patent

CA 2076914

Vinyl C1 to C3 alkanoate/C2 to C4 alkylene copolymer emulsions eg vinyl acetate/ethylene, are usable as wet adhesives and pressure sensitive adhesives for a number of applications. Their bonding to the surfaces of lower polarity, eg polyethylene, is improved by including vinyl esters of C4 to C18 primary or secondary carboxylic acids as a monomer. As the results presented in Table I indicate, a particularly preferred balance of properties, especially increased adhesion to hydrophobic substrates with little or no reduction in cohesive strength, is achieved by the use of the 2-ethyl hexanoate monomer, in accordance with a preferred embodiment of the invention.

Des émulsions de copolymères d'alcanoate C1 à C3 de vinyle/alkylène C2 à C4, p. ex. acétate de vinyle/éthylène, sont utilisables comme adhésifs humides ou adhésifs autocollants pour un certain nombre d'applications. Leur adhérence à des surfaces de polarité moindre, p. ex. le polyéthylène, est améliorée par ajout d'esters vinyliques d'acides carboxyliques primaires ou secondaires C4 à C18 comme monomères. Comme les résultats du tableau I le montrent, on obtient un ensemble de propriétés plus intéressantes, notamment une meilleure adhérence aux substrats hydrophobes avec peu ou pas de réduction de la force de liaison, grâce à l'emploi du monomère de 2-hexanoate d'éthyle, selon une version préférée de l'invention.

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