Burns, Doane, Swecker & Mathis, LLP
Rust-preventing lubricated steel materials and coating compositions therefor
A lubricated steel material has a lubricating film on the steel surface. The film has good press formability, film removability, and blocking resistance, and possesses a high level of rust preventing properties in that it can prevent the steel material from rusting when kept in stacked or coiled conditions with no oil application. The lubricated steel material is produced by coating a steel material with a coating composition comprising from 74% to 97.7% by weight of an acrylic resin having an acid number of from 30 to 150 and a glass transition temperature of from 5 to 90&deg; C., from 2% to 20% by weight of a water repellant, preferably one or more classes selected from the group consisting of carboxylic acid esters, metal soaps, polyethylene fine powder, and fluoroplastic fine powder, and from 0.3% to 6% by weight of an anticorrosive agent which is a mixture of an alkylamidecarboxylic acid or its salt and a nitrogen-containing basic compound, preferably an alkanolamine, followed by drying at a temperature of from 50 to 150&deg; C.
Sumitomo Metal Industries, Ltd. NOF Corporation
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Hiroyuki Katsuji Junji
Ito Kawanishi Matsuda