S-eb-s block copolymer/oil aqueous dispersion and its use in...

C - Chemistry – Metallurgy – 08 – J

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C08J 3/03 (2006.01) C08J 5/02 (2006.01) C08L 53/00 (2006.01)

Patent

CA 2233629

A dispersion has particles dispersed in a continuous aqueous dispersion medium. The particles, preferably no more than about 2 micrometers in size, are formed of a mixture of styrene/ethylene/butylene- styrene (S-EB-S) block copolymer having end blocks each with a weight average molecular weight of more than about 15,000 Daltons and an oil such as a mineral oil. The dispersion medium is a mixture of water and a surfactant. Articles are prepared by dipping a form into the dispersion and withdrawing the form to leave a film of the dispersion on the form. The water is evaporated from the film, leaving a coherent extensible film on the form.

L'invention concerne une dispersion dont les particules sont dispersées dans un milieu de dispersion aqueux en continu. Les particules, dont la taille n'est de préférence pas supérieure à 2 micromètres, sont constituées d'un mélange de copolymère séquencé styrène-éthylène/butylène-styrène (S-EB-S), dont chaque séquence terminale a un poids moléculaire moyen supérieur à environ 15 000 daltons, et d'une huile, telle qu'une huile minérale. Le milieu de dispersion est un mélange d'eau et d'un agent de surface. Les articles sont préparés comme suit: une forme est plongée dans la dispersion puis retirée de façon à être recouverte d'une pellicule. Après évaporation, l'eau laisse une pellicule extensible cohérente sur la forme.

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