Fire resistant thermoplastic silicone vulcanizates

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 23/12 (2006.01) C08K 3/34 (2006.01) C08L 23/06 (2006.01) C08L 83/04 (2006.01)

Patent

CA 2362044

A composition comprising a polyolefin, a polyorganosiloxane having at least two alkenyl groups per molecule, and calcium silicate where the polyorganosiloxane is cured after mixing using an organohydrido silicon compound and a hydrosilation catalyst to create a thermoplastic vulcanizate, provides excellent fire resistance. In particular such compositions when tested by burning at 40 to 88 kW/m2 external flux generate significantly less heat and smoke, and generate tougher chars compared to polyolefins alone, or mixtures of thermoplastic polyolefin resin, polyorganosiloxane and calcium silicate where the composition is not cured after mixing.

Cette invention concerne une composition comprenant une polyoélfine, un polyorganosiloxane comptant au moins deux groupes alcényle par molécule et une silicate de calcium. Le polyorganosiloxane est durci après mélange au moyen d'un composé organohydrido silicone et un catalyseur d'hydrolisation pour créer un vulcanisat thermoplastique offrant une remarquable résistance au feu. Dans le cadre d'essais où on les fait brûler sous un flux externe de 40 à 88 kW/m<2>, ces compositions dégagent en particulier beaucoup moins de chaleur et de fumées et produisent des charbons plus robustes que dans le cas de polyoléfines seules ou de mélanges de résine polyoléfinique thermoplastique, de polyorganosiloxane et de silicate de calcium sans cuisson de la composition après mélange.

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