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US Patent 7683139 Low NMP aqueous polyurethane composition with a diluent

Patent 7683139 was granted and assigned to DSM (company) on March, 2010 by the United States Patent and Trademark Office.

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Patent abstract

An aqueous composition with a sediment content <5%, comprising a polyurethane dispersion wherein the polyurethane has an acid value in the range of from 25 to 65 mgKOH/g and comprises (i) 36 to 60 wt % of at least one aromatic polyisocyanate and where the polyurethane is prepared in the presence of (a) <5 wt % of 1-methyl-2-pyrrolidinone by weight of the polyurethane, (b) at least one diluent and (c) water.

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