C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/3080
C08L 23/12 (2006.01) C08L 53/00 (2006.01)
Patent
CA 1300780
ABSTRACT OF THE DISCLOSURE A polypropylene composition capable of producing molded products having superior stiffness, impact resistance, transparency, resistance to whitening on impact on bending and luster is provided, which com- position has (i) a styrene-ethylene?butylene-styrene block copolymer or a styrene-ethylene-propylene block copolymer each in 5 to 30% by weight based on the weight of the composition, blended with a highly crystalline propylene homopolymer (A) having a relationship between its isotactic pentad ratio (P) and melt flow rate (MFR) represented by an expression of 1.00 ? P ? 0.015 log MFR + 0.955; (ii) a styrene-ethylene?butylene-styrene block copolymer or a styrene-ethylene?propylene block copolymer each in 5 to 30% by weight based on the weight of the composition and an ethylene-propylene copolymer rubber or a poly- ethylene each in 15% by weight based thereon, blended with the above (A), the blending proportion of (A) being 60% by weight or more based on the weight of the compo- sition; or (iii) a styrene-ethylene?butylene-styrene block copolymer or a styrene-ethylene?propylene block copolymer, each in 5 to 30% by weight based on the weight of the composition, an ethylene-propylene rubber and polyethylene each in 15% by weight or less based thereon, blended with the above (A), the blending proportion of (A) being 60% by weight or more based thereon.
552500
Kojima Osamu
Mori Kinya
Shimomura Yozo
Chisso Corporation
Macrae & Co.
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