Use of calcium carbonate in rigid poly(vinyl chloride)...

Details Use of calcium carbonate in rigid poly(vinyl chloride)... Use of calcium carbonate in rigid poly(vinyl chloride)...

C - Chemistry, Metallurgy

08

K

C08K 3/26 (2006.01) C08L 27/06 (2006.01)

Patent

CA 2478774

Poly(vinyl chloride) is compounded with a chalk-like, essentially pure calcium carbonate to provide improved weathering resistance of rigid poly(vinyl chloride) articles subjected to external exposures of heat and sunlight. Blends and alloys are also disclosed. Optionally, one can add either zinc alkyl ester scavenger, organotin stabilizer, or both to further improve the effectiveness of the essentially pure calcium carbonate.

Le poly(chlorure de vinyle) est composé d'un carbonate de calcium essentiellement pur de type craie qui permet d'obtenir des articles rigides en poly(chlorure de vinyle) ayant une meilleure résistance à l'altération atmosphérique lorsqu'ils sont exposés à la chaleur et à la lumière solaire. L'invention porte également sur des mélanges et sur des alliages. On peut éventuellement ajouter un capteur d'ester alkylique de zinc, un stabilisateur d'organotine ou les deux pour conférer au carbonate de calcium essentiellement pur une meilleure efficacité.

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