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US 4,229,504 AGranted
Polyolefin composition having high impact resistance and high temperature flow resistance
AssigneeBethlehem Steel Corporation
InventorArmand E. Brachman
Life of this patent
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Abstract
A polyolefin composition having a high level of impact resistance and high temperature flow resistance comprising 30 to 90 weight percent resin containing greater than 50 to less than 75 weight percent of polyolefin and greater than 25 to less than 50 weight percent elastomer, and 10 to 70 weight percent filler.
Claims21
As a new composition of matter, a resin blend of polyolefin and an elastomer to which a filler is added characterized by having rigidity, a high level of impace resistance and high temperature flow resistance, consisting essentially of:
- p1 (a) about 30 to 90 weight percent of a resin containing
- (i) greater than 50 to less than 75 weight percent of at least one polyolefin selected from the group consisting of isotactic crystalline polypropylene, high density crystalline polyethylene, low density polyethylene and propylene-ethylene copolymers in which propylene is present in 85-95% by weight and which has a tensile yield elongation no greater than 20%, and
- (ii) greater than 25 to less than 50 weight percent of elastomer and
- (b) about 10 to 70 weight percent of an inorganic filler selected from the group consisting of calcium carbonate, talc, clay, silica, quartz, mica, and barytes.
1 more element
Dependencies are inferred from the claim text.