Lubricated metallic container stocks and method of preparing the

Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...

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413 18, 413 19, 148 6, 148 63, 204 37T, 252 56R, 252 56S, 4273881, 427409, 427421, 428 35, 428411, 428457, 428467, 2065243, B32B 1518, B32B 1520

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active

RE0313491

ABSTRACT:
Metallic container stocks are lubricated with citric acid esters. The improved lubricated container stocks of the invention are characterized by excellent wettability and adhesion of organic coatings in general and especially epoxy resin coating compositions. The citric acid ester lubricants are pharmacologically safe and are easily applied at low cost by electrostatic deposition and other methods presently used for applying prior art lubricating agents. The method of the invention is especially useful in lubricating tinplate strip, blackplate strip, blackplate strip having a chromium-containing coating thereon, and aluminum strip of container stock gauge with citric acid ester lubricants having the following structural formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are individually selected from the group consisting of hydrogen and alcoholic residual containing 1-18 carbon atoms, R.sub.4 is selected from the group consisting of hydrogen and carboxylic acid radicals containing 1-18 carbon atoms, and at least one of R.sub.1, R.sub.2 and R.sub.3 is an alcoholic residue. The invention further provides a novel method of applying an organic coating on lubricated metallic container stocks.

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