Poly vinyl chloride foam promoters

Details Poly vinyl chloride foam promoters Poly vinyl chloride foam promoters

C - Chemistry, Metallurgy

08

J

C08J 9/06 (2006.01) C08L 27/06 (2006.01)

Patent

CA 2737471

The density of rigid foamed articles made by the thermal decomposition of a blowing agent in a vinyl chloride polymer is reduced by the use of a tin based blowing agent activator(s). The tin based activator also reduces the activation temperature of a chemical blowing agent, allowing for more optimal evolution of gas during plastic processing. Dibutyl tin oxide or tin maleates are superior activators of vinyl chloride polymer blowing agents.

Selon linvention, la densité d'articles moussés rigides obtenus par la décomposition thermique d'un agent gonflant dans un polymère de chlorure de vinyle est réduite par l'utilisation d'un ou de plusieurs activateurs d'agent gonflant, à base d'étain. L'activateur à base d'étain permet également de réduire la température d'activation d'un agent gonflant chimique, permettant un dégagement plus optimal du gaz durant le traitement de la matière plastique. L'oxyde de dibutylétain ou les maléates d'étain sont des activateurs supérieurs d'agents gonflants de polymères de chlorure de vinyle.

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