Automotive articles prepared from filled tpo compositions,...

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 23/12 (2006.01) C08K 3/34 (2006.01) C08L 23/08 (2006.01)

Patent

CA 2612228

An automotive part containing at least one component formed from a composition comprising the following: (i) a crystalline, isotactic propylene homopolymer, (ii) an ethylene/.alpha.-olefm elastomeric impact modifier, and (iii) a reinforcing grade of filler, for example, talc. The crystalline isotactic propylene homopolymer has a flex modulus of greater than about 1930 MPa and a heat deflection temperature (HDT) of greater than about 100~C; the ethylene/.alpha.-olefin interpolymer has a Tg of less than about -30~C, and a tan delta measured at 0.1 radians/s at 190~C of less than about 2; and the filler has a HDT reinforcing efficiency of at least about 2. The automotive part has an HDT of greater than about 100~C and a flex modulus of greater than about 1930 MPa.

La présente invention concerne un élément pour automobile contenant au moins un composant réalisé à partir d'une composition qui contient: (i) un homopolymère de propylène isotactique cristallin, (ii) un antichoc élastomère à base d'éthylène et d'a-oléfine, et (iii) un charge de renfort, par exemple du talc. L'homopolymère de propylène isotactique cristallin présente un module de souplesse supérieur à environ 1930 MPa et une température de fléchissement à la chaleur (HDT) supérieure à environ 100°C; l'interpolymère éthylène/a-oléfine présente une Tg inférieure à environ -30°C, et un angle de perte mesuré à 0,1 radians/s à 190°C inférieur à environ 2; et un agent de remplissage présente une efficacité de renfort HDT d'au moins environ 2. L'élément pour automobile présente une HDT supérieure à environ 100°C et un module de souplesse supérieur à environ 1930 MPa.

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