C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 75/08 (2006.01) C08L 51/04 (2006.01) C08L 75/06 (2006.01)
Patent
CA 2217904
A thermoplastic composition comprising a resinous blend of a polyether-polyol based thermoplastic polyurethane having a Shore A hardness no greater than 90, and a grafted polybutadiene rubber is disclosed. In the inventive composition, the relative amount in the blend of polyurethane predominates the amount of grafted polybutadiene rubber. The composition is especially suitable for the preparation, by thermoforming, of articles having low gloss which are additionally characterized by their "soft-touch". Also disclosed is a method for reducing the 60 degree gloss of a thermoformed article prepared from a thermoplastic composition containing a blend of thermoplastic polyurethane and grafted polybutadiene rubber.
L'invention porte sur une composition thermoplastique renfermant un mélange résineux d'un polyéther-polyol à base de polyuréthane thermoplastique d'une dureté Shore A maximale de 90, et sur un caoutchouc de polybutadiène greffé. Dans la composition de l'invention, la quantité relative de polyuréthane dans le mélange dépasse la quantité de caoutchouc de polybutadiène greffé. La composition convient particulièrement bien à la production, par thermoformage, d'articles possédant un faible brillant et doux au toucher. L'invention présente également une méthode pour réduire le brillant de 60 degrés d'un article thermoformé, préparé à partir d'une composition thermoplastique renfermant un mélange de polyuréthane thermoplastique et de caoutchouc de polybutadiène greffé.
Nardi Donald P.
Schmid Charles G.
Corporation Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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