| 摘要 |
This invention discloses a polymer composition for the coating of substrates, comprising an aqueous alkaline blend having a binder consisting essentially of two components. Component A) is an addition copolymer of (1) about 3% to about 30% by weight of an olefinically unsaturated monomer containing a carboxyl group or mixture thereof, (2) at least one ester of acrylic or methacrylic acid, and, optionally, (3) other olefinically unsaturated monomers, the total of (1), (2) and (3) being 100%. The weight average molecular weight of the copolymer is between 10,000 and 500,000, and it is in the form of a solution or a colloidal solution in an aqueous phase. Component B) is an oligomeric addition copolymer of (1) at least one ester of acrylic or methacrylic acid, (2) 9% to about 50% of an olefinically unsaturated monomer having at least one carboxyl group, and, optionally, (3) other olefinically unsaturated monomers, the total of (1), (2) and (3) being 100%. The weight average molecular weight of this copolymer is between 400 and 6,000, and the molecular weight distribution is such that the heterogeneity index is 3 or less. In the blend, on a solids basis, (A) is from 90 to 10 percent and (B) being from 10 to 90 percent by weight. Coatings employing these compositions are particularly useful as lubricants between metal working tools and the metal being worked.
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