Improved polyolefin thermoplastic resin compositions

C - Chemistry – Metallurgy – 08 – L

Patent

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400/3029, 400/30

C08L 23/02 (2006.01) C08K 3/00 (2006.01) C08L 23/16 (2006.01) C08L 53/00 (2006.01)

Patent

CA 1248270

ABSTRACT Polyolefin thermoplastic resin compositions are improved by incorporating therein an ethylene-alpha-olefin copolymer rubber and an effective amount of a particulate or fibrous material selected from talc, mica, and fibrous crystalline calcium silicate having a high aspect ratio at specific ratios. When talc is used, the average particle diameter is 0.5 to 15 microns; when mica is used, the average particle diameter is 1 to 200 microns; and when fibrous crystalline calcium silicate is used, the average particle diameter is 1 to 100 microns. The crystalline polyolefin is present in an amount of about 20 to 79 wt.%; the ethylene-alpha-olefin copolymer rubber in an amount of about 20 to 50 wt.%; and the filler in an amount of about 1 to 30 wt.%. The incorporation of the copolymer rubber and particulate or fibrous material improves the copolymer's low temperature impact resistance, finishing and moldability properties without sacrificing mechanical properties. Other properties improved include dimensional stability in molding, paintability, reduced warpage, and improved weld strength. The improved composition is useful in such applications as automobile bumpers.

404577

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