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Glidden patents ambient dry paint



Published September 12, 2006
Patent No. U.S. 7,049,357 B2
The Glidden Company has obtained a patent for an ambient dry paint coating composition substantially free of volatile organic coalescing solvent. The paint has a film forming polymeric binder comprising by weight an aqueous emulsion polymeric film forming matrix polymer of copolymerized ethylenically unsaturated monomers; and at least three percent of a low molecular weight poly (hydroxy alkanoic acid) oligomer of copolymerized hydroxy alkanoic acid having from two to four carbon atoms and being an external modifier of the matrix polymer, the oligomer having a number average molecular weight between about 300 and 10,000 and a Tg below approximately 0° C, the oligomer having terminal alkyl aliphatic ester groups where the alkyl chain has from three to 20 carbon atoms, where the mixture of the oligomer and the matrix polymer are film forming and provide an air dry coating composition substantially free of organic coalescing solvent.


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