Highly filled soft polyolefin compositions

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 23/16 (2006.01) C08L 23/08 (2006.01) C08L 23/10 (2006.01) C08L 23/12 (2006.01) C08L 23/14 (2006.01)

Patent

CA 2479994

Polyolefin compositions filled with high amounts of inorganic fillers comprising, by weight: (I) 20 to 60% by weight of an heterophasic polyolefin composition comprising: A) from 8 to 25% by weight of a crystalline polymer fraction selected from propylene homopolymer, propylene copolymers and mixture there; and B) from 75 to 92% by weight of an elastomeric fraction comprising at least an elastomeric copolymer of propylene or ethylene with 15 to 45% of at least one alpha-olefin, having solubility in xylene at room temperature greater than 50% by weight, the intrinsic viscosity of the xylene soluble fraction ranging from 3.0 to 6.5 dl/g; and (II) 40 to 80% by weight of an inorganic filler selected from flame-retardant inorganic fillers and inorganic oxides or salts.

L'invention concerne des compositions de polyoléfine contenant de fortes charges inorganiques. Les compositions de polyoléfine contiennent, en poids: i) 20 à 60 % en poids d'une composition de polyoléfine hétérophasique comprenant: a) entre 8 et 25 % en poids d'une fraction de polymère cristallin sélectionnée dans le groupe constitué par des homopolymères de propylène, des copolymères de propylène et leur mélange; et b) entre 75 et 92 % en poids d'une fraction élastomérique comprenant au moins un copolymère élastomérique de propylène ou d'éthylène, avec 15 à 45 % d'au moins une alpha-oléfine, et présentant une solubilité du xylène supérieure à 50 % en poids à température ambiante, la viscosité intrinsèque de la fraction de xylène soluble étant comprise entre 3,0 et 6,5 dl/g; et ii) 40 à 80 % en poids d'une charge inorganique choisie parmi des charges inorganiques ignifugeantes ou des oxydes inorganiques ou des sels.

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