Overcoat and adhesive compositions based on chlorinated...

C - Chemistry – Metallurgy – 09 – J

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C09J 123/28 (2006.01) C08F 8/00 (2006.01) C08F 8/22 (2006.01) C09J 115/02 (2006.01)

Patent

CA 2177836

Adhesive compositions based on chlorinated polyolefins having chlorine contents greater than about 60 percent and molecular weights greater than about 500. The adhesive compositions contain the chlorinated polyolefin and a crosslinking agent. The chlorinated polyolefins are advantageous in that they cam be prepared in an environmentally acceptable manner and can be utilized as a substitute for the traditional chlorinated natural rubber materials utilized in adhesive compositions without compromising adhesive performance. Preferred chlorinated polyolefins are prepared by a process involving the dispersion and chlorination of high surface are apolyolefinic particles in an aqueous medium.

L'invention concerne des compositions adhésives à base de polyoléfines chlorées dont la teneur en chlore est supérieure à environ 60 pour cent et le poids moléculaire supérieur à 500. Les compositions adhésives contiennent la polyoléfine chlorée et un agent de réticulation. Les polyoléfines chlorées sont avantageuses car elles peuvent être préparées d'une manière acceptable pour l'environnement, et elles peuvent être utilisées comme substitut des matériaux en caoutchouc naturel chloré traditionnel utilisés dans les compositions adhésives sans nuire à la performance adhésive. Les polyoléfines chlorées préférées sont préparées selon un procédé consistant en la dispersion et la chloration de particules polyoléfiniques présentant une aire de surface importante, dans un milieu aqueux.

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