Method of making painted automobile components
First Claim
1. A method of making a painted article which comprises:
- molding in the form of an article a polymer blend composition comprising about 40 to 90% by weight of the composition of a crystalline or semi-crystalline polyolefin, about 10% to 50% by weight of the composition of a first rubber component of an ethylene-propylene-diene rubber having a weight average molecular weight of about 40,000 to 300,000, and about 1 to 20% by weight of a second rubber component of an ethylene-propylene-diene rubber having a number average molecular weight of at least about 2,000, wherein the molecular weight of the first rubber component is at least about 4 to 200 times that of the second rubber component, and painting at least part of the article with a two-component polyurethane system comprising a base coat and a clear coat, wherein said base coat is selected from the group consisting of 2 component urethane metallic base coats and 2 component urethane solid base coats.
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Accused Products
Abstract
A method of making articles of manufacture, such as automobile bumpers and other components, formed from thermoplastic olefin compositions, having improved resistance to gasoline and other fluids when painted with flexible coatings such as two component polyurethane paints, and the like, are disclosed. The compositions used to form these articles include a thermoplastic olefin such as crystalline polypropylene, crystalline polyethylene or mixtures thereof with a first rubber component of an ethylene propylene diene rubber having a high molecular weight and a second rubber component of an ethylene propylene diene rubber having a low molecular weight, wherein the first rubber component has a molecular weight of 4 to 200 times that of the second rubber component.
25 Citations
20 Claims
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1. A method of making a painted article which comprises:
- molding in the form of an article a polymer blend composition comprising about 40 to 90% by weight of the composition of a crystalline or semi-crystalline polyolefin, about 10% to 50% by weight of the composition of a first rubber component of an ethylene-propylene-diene rubber having a weight average molecular weight of about 40,000 to 300,000, and about 1 to 20% by weight of a second rubber component of an ethylene-propylene-diene rubber having a number average molecular weight of at least about 2,000, wherein the molecular weight of the first rubber component is at least about 4 to 200 times that of the second rubber component, and painting at least part of the article with a two-component polyurethane system comprising a base coat and a clear coat, wherein said base coat is selected from the group consisting of 2 component urethane metallic base coats and 2 component urethane solid base coats.
- View Dependent Claims (3, 4, 5, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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2. A method of improving the fluid resistance of polymeric articles which comprises:
- forming a polymer blend composition into a preform, said polymer blend composition comprising;
about 40 to 90% by weight of the composition of a crystalline or semi-crystalline polyolefin, about 10% to 50% by weight of the composition of a first rubber component of an ethylene-propylene-diene rubber having a weight average molecular weight of between about 40,000 and 300,000, and about 1 to 20% by weight of a second rubber component of an ethylene-propylene-diene rubber having a number average molecular weight of about 2,000 to 10,000; and
applying to one or more surfaces of said preform a paint composition comprising a base coat and a clear coat, wherein said base coat is selected from the group consisting of 2 component urethane metallic base coats and 2 component urethane solid base coats, wherein said paint composition durable adheres to said preform to improve the fluid resistance of the article. - View Dependent Claims (6, 7, 8)
- forming a polymer blend composition into a preform, said polymer blend composition comprising;
Specification