Polyolefinic compositions having good whitening resistance

Details Polyolefinic compositions having good whitening resistance Polyolefinic compositions having good whitening resistance

C - Chemistry, Metallurgy

08

L

C08L 23/14 (2006.01) C08L 23/10 (2006.01)

Patent

CA 2592143

A polypropylene composition comprising (per cent by weight) (a) 50-77% of a crystalline propylene polymer having an amount of isotactic pentads (mmmm), measured by 13C-MNR on the fraction insoluble in xylene at 25~ C, higher than 97.5 molar % and a polydispersity index ranging from 4 to 10; (b) 13-28% of an elastomeric copolymer of ethylene and propylene, the copolymer having an amount of recurring units deriving from ethylene ranging from 30 to 70% and being partially soluble in xylene at ambient temperature, the polymer fraction soluble in xylene at ambient temperature having an intrinsic viscosity value ranging from 2 to 4 dl/g; and (c) 10-22% of polyethylene having an intrinsic viscosity value ranging from 1 to 3 dl/g, in said composition component (b) plus component (c) being in amounts of at least 25 wt%. The polymer composition exhibits good impact resistant, whitening resistance and relatively low stiffness.

L'invention porte sur une composition de polypropylène comprenant (en % en poids) (a) entre 50 et 77 % d'un polymère de polypropylène cristallin ayant une quantité de pentads isotactiques (mmmm), mesurée par 13C-MNR sur la fraction insoluble dans le xylène à 25° C, et supérieure à 97,5 % en moles, et un indice de polydispersité compris entre 4 et 10; (b) entre 13 et 28 % d'un copolymère élastomère d'éthylène et de propylène, le copolymère ayant une quantité de motifs récurrents dérivés de l'éthylène comprise entre 30 et 70 % et étant partiellement soluble dans le xylène à température ambiante, la fraction polymère soluble dans le xylène à température ambiante ayant un indice de viscosité intrinsèque compris entre 2 et 4 dl/g; et (c) entre 10 et 22 % de polyéthylène ayant un indice de viscosité intrinsèque compris entre 1 et 3 dl/g. La composition comprend au moins 25 % en poids du composant (b) plus le composant (c). La composition polymère présente une bonne résistance aux chocs, au blanchiment, ainsi qu'une raideur relativement faible.

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