Painted polymeric articles having improved properties
AssigneeD&S Plastics International
InventorSatchit Srinivasan
Life of this patent
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Abstract
Thermoplastic olefin compositions having improved fluid resistance when painted with flexible coatings such as polyurethanes paints and the like are disclosed. These compositions include a thermoplastic olefin such as crystalline polypropylene, crystalline polyethylene, or mixtures thereof with a first rubber component of an ethylene-propylene or ethylene-propylene-diene rubber having a Mooney Viscosity of 10-120 and a second rubber component of an ethylene-propylene or ethylene-propylene-diene rubber having a number average molecular weight of between about 1,000 and 10,000.
Claims20
An article of manufacture having improved resistance to fluids comprising a substrate formed of a polymer blend and having one or more surfaces, said polymer blend consisting essentially of:
- a substantially crystalline polyolefin;
- about 10% to 50% by weight of the composition of a first rubber component of an ethylene-propylene rubber having a Mooney Viscosity (ML.sub.1+4, 100.degree. C.) of between about 10 and about 120;
- and
- about 1 to 20% by weight of a second rubber component of an ethylene-propylene rubber having a number average molecular weight of between about 1,000 and 10,000.
An article of manufacture having improved resistance to fluids comprising a substrate fromed of a polymer blend and having one or more surfaces, said polymer blend consisting essentially of:
- a substantially crystalline polyolefin;
- about 10% to 50% by weight of the composition of a first rubber component of an ethylene-propylene rubber having a Mooney Viscosity (ML.sub.1+4, 100.degree. C.) of between about 10 and about 120;
- a compatibilizing agent of a copolymer of polypropylene with a polar compound;
- and
- about 1 to 20% by weight of a second rubber component of an ethylene-propylene rubber having a number average molecular weight of between about 1,000 and 10,000.
An article of manufacture having improved resistance to fluids comprising a substrate formed of a polymer blend and having one or more surfaces, said polymer blend consisting essentially of:
- a substantially crystalline polyolefin of polyethylene, polypropylene or mixtures thereof, said polyolefin being present in an amount of between about 40-90% by weight of the composition;
- about 10% to 50% by weight of the composition of a first rubber component of an ethylene-propylene rubber having a Mooney Viscosity (ML.sub.1+4, 100.degree. C.) of between about 25 and about 80;
- and
- about 1 to 20% by weight of a second rubber component of an ethylene-propylene rubber having a number average molecular weight of between about 1,000 and 10,000.
Dependencies are inferred from the claim text.