Aqueous coating composition
AssigneeRohm and Haas Company
InventorDonald Thomas Robertson
Life of this patent
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Abstract
An aqueous coating composition including a polyurethane polymer which contains carboxylic acid groups, a crosslinking agent, a wetting agent, a slip aid, and a UV stabilizing agent is provided. Coatings prepared from the aqueous coating composition are durable and have low surface friction, flexibility at low temperatures, and adhesion to low surface energy substrates. A method of preparing a substrate coated with the aqueous coating composition and an article containing the coated substrate are also provided. The aqueous coating composition is useful for providing a protective coating with a low friction surface for automotive weatherstrip.
Claims10
An aqueous coating composition comprising, based on the weight of said aqueous coating composition:
- a) from 10 to 70 weight % of at least one polyurethane polymer, wherein said polyurethane polymer contains at least two carboxylic acid groups;
- b) from 1 to 60 weight % of at least one crosslinking agent;
- c) from 0.01 to 4 weight % of at least one wetting agent;
- d) from 0.1 to 15 weight % of at least one slip aid;
- and
- e) from 0.01 to 20 weight % UV stabilizing agent.
A method of preparing a coated substrate comprising the steps of:
- a) preparing an aqueous coating composition comprising:
- i) from 10 to 70 weight % of at least one polyurethane polymer,
- wherein said polyurethane polymer contains at least two carboxylic acid groups;
- ii) from 1 to 60 weight % of at least one crosslinking agent;
- iii) from 0.01 to 4 weight % of at least one wetting agent;
- iv) from 0.1 to 15 weight % of at least one slip aid;
- and
- v) from 0.01 to 20 weight % UV stabilizing agent;
- b) applying said aqueous coating composition to a substrate;
- c) drying or allowing to dry said aqueous coating composition to provide a precrosslinked coated substrate;
- and
- d) curing or allowing to cure said precrosslinked coated substrate to provide said coated substrate.
An article comprising a coated substrate comprising:
- a) a substrate;
- and
- b) a coating prepared from an aqueous coating composition comprising:
- i) from 10 to 70 weight % of at least one polyurethane polymer,
- wherein said polyurethane polymer contains at least two carboxylic acid groups;
- ii) from 1 to 60 weight % of at least one crosslinking agent;
- iii) from 0.01 to 4 weight % of at least one wetting agent;
- iv) from 0.1 to 15 weight % of at least one slip aid;
- and
- v) from 0.0.1 to 20 weight % UV stabilizing agent.
Dependencies are inferred from the claim text.