Propylene polymer composition
AssigneeIdemitsu Petrochemical Co., Ltd.
InventorsToshikazu Kasahara, Makoto Iida
Life of this patent
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Abstract
A propylene polymer composition having excellent whitening resistance, impact resistance, rigidity and flowability. The propylene polymer composition comprises (A) 100 parts by weight of a propylene polymer or a modified polymer obtained by heat-treating the propylene polymer in an organic peroxides and (B) 0.1 to 1.5 parts by weight of an ester of an aliphatic saturated monocarboxylic acid and a polyhydric alcohol, and the propylene polymer essentially consists of two particular polymer fractions or three particular polymer fractions polymerized over stereoregular catalysts and combinationed in a specific ratio.
Claims8
A propylene polymer composition comprising
- (A) 100 parts by weight of a propylene polymer or a modified polymer obtained by heat-treating said propylene polymer in the presence of an organic peroxide to a degradation degree of 1.2-80, said propylene polymer essentially consisting of the following two fractions (a) or three fractions (b) obtained by polymerization over a stereoregular catalyst:
- (a)
- (i) 70-95% by weight of a propylene homopolymer or a propylene-ethylene copolymer having an ethylene content of not more than 2% by weight;
- and
- (ii) 30-5% by weight of a propylene-ethylene copolymer having an ethylene content of 10-50% by weight;
- or
- (b)
- (iii) 50-94% by weight of a propylene homopolymer having an intrinsic viscosity [.eta.] of 0.5-2.5 dl/g;
- (iv) 3-30% by weight of a propylene homopolymer having an intrinsic viscosity [.eta.] of more than 2.5 dl/g;
- and
- (v) 3-30% by weight of a propylene-ethylene copolymer having an intrinsic viscosity [.eta.] of not less than 2.8 dl/g;
- and
- (B) 0.1 to 1.5 parts by weight of an ester derived from an aliphatic saturated monocarboxylic acid of from 12 to 22 carbon atoms and a polyhydric alcohol.
Dependencies are inferred from the claim text.