Thermoplastic olefin compositions
AssigneeExxon Chemical Patents Inc.
InventorsLawrence George Kaufman, Charles Cozewith, Avinash Chandrakant Gadkari, Narayanaswami Raja Dharmarajan, Maria Dolores Ellul
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Abstract
The invention relates to novel Thermoplastic Olefin compositions comprising polypropylene, and ethylene-alpha olefin elastomer and a compatabilizer comprising an ethylene-propylene copolymer having a propylene content of greater than 80 weight percent. The ethylene-propylene copolymer compatabilizer imparts a greater degree of compatibility between the polypropylene and elastomer phases yielding improved physical properties.
Claims16
A thermoplastic olefin composition comprising:
- (a) 88 to 50 weight percent polypropylene, said polypropylene having a melt flow rate of at least 20 g/10 minutes as determined by ASTM D1238, condition L;
- (b) 10 to 50 weight percent elastomer wherein said elastomer is selected from the group consisting of ethylene-alpha olefin elastomers and ethylene-alpha olefin-diene elastomers;
- wherein said elastomer has an ethylene content that ranges from 90 to 45 weight percent;
- (c) 2 to 15 weight percent of a compatabilizer comprising an ethylene-propylene copolymer having a propylene content of at least 80 weight percent, wherein said compatabilizer has a molecular weight distribution of from 1.8 to 4.5 and further wherein said compatabilizer is produced using a metallocene polymerization catalyst.
A thermoplastic olefin composition comprising:
- 65-75 weight percent polypropylene, said polypropylene having a melt flow rate of at least 35 g/10 minutes as determined by ASTM D1238, condition L;
- 20 to 40 weight percent elastomer, said elastomer selected from the group consisting of ethylene-alpha olefin copolymer and ethylene alpha-olefin diene terpolymers, wherein said elastomer has an ethylene content that ranges from 90 to 45 weight percent;
- and a 3 to 7 weight percent compatabilizer comprising an ethylene-propylene copolymer having from 83 to 91 weight percent propylene, wherein said compatabilizer has a molecular weight distribution of from 2 to 3 and is produced using a metallocene polymerization catalyst.
Dependencies are inferred from the claim text.