Basell Poliolefine Italia, S.p.a.

Yutaka Yokoyama

Takeshi Nakajima

Anteo Pelliconi

Junichiro Washiyama

Hiroshi Takenouchi

Enea Garagnani

Kazuhiko Minowa

Masamitsu Yamauchi

A masterbatch composition comprising (1) 10-50 wt % of a crystalline propylene homopolymer and (2) 50-90 wt % of a blend consisting of (a) a copolymer of ethylene and one or more C4-CIO a-olefin(s), containing 10-40 of C4-CIO a-olefin(s), and (b) an amorphous copolymer of propylene and ethylene. Copolymer (b) has an ethylene content from 20-70 wt %, and an intrinsic viscosity value of the xylene-soluble moiety of from 2.2 to 3.5 d/Lg, this value being equal to 0.8 to 1.2 times the intrinsic viscosity value of the xylene-soluble moiety of copolymer (a). The weight ratio of copolymers (a)/(b) is from 3/1 to 1/3. Polyolefin compositions comprising the said masterbatch composition are suitable for the manufacture of automotive parts.

Polyolefin masterbatch for preparing impact-resistant polyolefin articles

A masterbatch composition, a polyolefin composition prepared from the masterbatch and articles prepared from the polyolefin composition. The masterbatch contains (percent by weight) from 20% to 90% of A) a crystalline polypropylene containing from 25% to 75% of a fraction A having a melt flow rate MFR of from 0.5 to 10 g/10 min., and from 75% to 25% of a fraction A having a melt flow rate MFR such that MFR /MFR is from 30 to 2000; and from 10% to 80% of B) a copolymer of ethylene and at least one C -C &agr;-olefin, the copolymer containing from 10 to 70% of ethylene, the copolymer being soluble in xylene at room temperature, and having an intrinsic viscosity &lsqb;&eegr;&rsqb; of from 4 to 9 dl/g. Articles prepared from the polyolefin composition exhibit a good balance of physical properties and reduced surface defects such as tiger striping.

Polyolefin masterbatch and composition suitable for injection molding

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Kawasaky, Japan

Yutaka Yokoyama