Polyurethane-based binder dispersion
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United States of America Patent
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Jan 30, 2015
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Jan 30, 2015
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A binder dispersion includes water and polyurethane. The polyurethane is formed from polyisocyanate; polyol having two hydroxyl (OH) groups at one chain end, no OH groups at an opposed chain end, and a number average molecular weight (Mn) ranging from ˜500-˜5,000; an alcohol, diol or amine having a Mn<500; and one of i) a carboxylic acid; ii) a sulfonate or sulfonic acid having one amino group; iii) i and ii; iv) i and a homopolymer or copolymer of poly(ethylene glycol) (PEG) having one or two OH or amino groups at one chain end; v) ii and a homopolymer or copolymer of PEG having one or two OH or amino groups at one chain end; or vi) i, ii, and a homopolymer or copolymer of PEG having one or two OH or amino groups at one chain end.
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