Filled tpo compositions, methods of making the same, and...

C - Chemistry – Metallurgy – 08 – L

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

Patent

CA 2612231

Compositions comprising (i) a crystalline, isotactic propylene homopolymer, (ii) an ethylene/.alpha.-olefin 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 composition has an HDT of greater than about 100 ~C and a flex modulus of greater than about 1930 MPa.

La présente invention concerne des compositions comprenant (i) un homopolymère de propylène isotactique cristallin, (ii) un agent anti-choc élastomère éthylène/.alpha.-oléfine, et (iii) une dose de renfort d'un agent de remplissage, par exemple, du talc. L'homopolymère 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/.alpha.-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 l'agent de remplissage présente une efficacité de renforcement HDT d'au moins 2. La composition décrite dans cette invention présente une HDT supérieure à environ 100°C et un module de souplesse supérieure à environ 1930 Mpa.

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