Low VOC, water-based coating compositions suitable for protecting metal containing substrates including food and beverage packages
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United States of America Patent
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May 29, 2018
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Mar 13, 2013
filing date -
Apr 18, 2012
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Abstract
Coating compositions and methods of using these compositions to form tough, abrasion resistant, and water resistant coatings on metal-containing substrates are described. Coating compositions are derived from one or more ingredients comprising at least one copolymer, referred to herein as Copolymer I, that preferably comprises (a) one or more repeating units (Repeating Unit(s) A) comprising at least one hydrophilic ester functionality and at least one polar functionality; and (b) one or more additional kinds of copolymerizable repeating units (Repeating Unit(s) B). Preferably, repeating Unit(s) A are a residue of an unsaturated monoester of a diacid or anhydride thereof having a carbon-carbon double bond, wherein at least one hydrophilic ester is pendant from a first carbon of the carbon-carbon double bond and at least on polar group is pendant from the second carbon of the carbon-carbon double bond. The monoester preferably is the reaction product of one or more water soluble or water dispersible alcohols with an unsaturated diacid or anhydride thereof.
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