STEEL SHEET HAVING ALKALI-SOLUBLE LUBRICATING FILM, METHOD FOR PRODUCING SAME, AND COMPOSITION
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United States of America Patent
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Issued Date -
Nov 19, 2015
app pub date -
Dec 27, 2012
filing date -
Dec 27, 2012
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Abandoned
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Abstract
The present invention provides a steel sheet which has an alkali-soluble lubricating film on the surface, wherein the lubricating film has a first layer that contains (A) a polyethylene oxide having a weight average molecular weight of 50,000-500,000 and (B) a copolymer of (X) a styrene hydrocarbon compound or an olefin hydrocarbon compound having 3 or more carbon atoms and (Y) a polymerizable unsaturated compound having a carboxylic acid anhydride group and/or a polymerizable unsaturated compound having a carboxy group, said compounds being copolymerizable with the compound (X), wherein some or all of the carboxylic acid anhydride groups and the carboxy groups contained in the copolymer may be ammonia-modified, imidized or blocked by an alcohol.
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