Elastoplastic polyolefin compositions having low gloss

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 23/16 (2006.01) C08F 2/00 (2006.01) C08L 23/14 (2006.01)

Patent

CA 2625924

Elastoplastic polyolefin composition comprising, in percent by weight: A) 10- 50 % of a copolymer of propylene with one or more comonomer(s) selected from ethylene and CH2=CHR alpha-olefins where R is a 2-8 carbon alkyl, which copolymer contains from 1 to 8% of comonomer(s); B) 50-90 % of a copolymer of ethylene and (i) propylene or (ii) CH2=CHR alpha-olefins, where R is a 2-8 carbon alkyl radical,or (iii) a combination thereof, optionally with minor amounts o f a diene, containing from 57 to 80 % of ethylene; wherein the weight ratio B/XS of the content B of copolymer component (B) to the fraction XS soluble in xylene at room temperature, both referred to the total weight of (A) + (B), is of 1.5 or less, and the intrinsic [.eta.] viscosity of the said XS fraction is of 3 dl/g or more.

La présente invention concerne une composition de polyoléfine élastoplastique comprenant, en pourcentage en poids : A) de 10 à 50 % d'un copolymère de propylène avec un ou plusieurs comonomères choisis parmi l'éthylène et des alpha-oléfines CH2=CHR, R représentant un radical alkyle contenant 2 à 8 atomes de carbone, lequel copolymère contenant de 1 à 8 % de comonomères; B) de 50 à 90 % d'un copolymère d'éthylène et (i) de propylène ou (ii) d'alpha-oléfines CH2=CHR, R représentant un radical alkyle contenant 2 à 8 atomes de carbone, ou (iii) d'une combinaison de ces-derniers, éventuellement avec des quantités mineures d'un diène, contenant de 57 à 80 % d'éthylène; le rapport en poids B/XS de la teneur B du composant copolymère (B) sur la fraction SX soluble dans le xylène à la température ambiante, toutes les deux sur la base du poids total de (A) + (B), étant inférieur ou égal à 1,5, et la viscosité intrinsèque [.eta.] de ladite fraction SX étant supérieure ou égale à 3 dl/g.

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