Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1989-08-21
1993-02-09
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524821, 524828, 524831, 524832, C08L 3300
Patent
active
051853973
ABSTRACT:
A polymeric emulsion comprising a (i) polymer, (ii) water, and (iii) a surfactant is useful as a binder for a water-based varnish that is resistant to water, 50% ethanol, and alkali. The polymer comprises about 20 to about 40 weight percent of a soft monomer whose homopolymer has a T.sub.g of less than about -20.degree. C. and about 60 to about 80 weight percent of a mixture of hard monomers each of whose homopolymer has a T.sub.g of greater than about 30.degree. C. As part of the hard monomer comonent of the polymer, the polymer comprises about 5 to about 25 weight percent acrylonitrile and about 1 to about 5 weight percent of an olefinic carboxylic acid. Typically, the polymer comprises less than about 1 weight percent surfactant and has a calculated T.sub.g of about 25.degree. to about 60.degree. C., an actual T.sub.g of about 30.degree. to about 70.degree. C., and an average particle size of less than about 250 nm. The emulsion generally comprises at least about 40 weight percent solids and has a surface tension of at least about 45 dynes/cm.
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Marquis Melvyn I.
Rohm and Haas Company
Sweet Mark
Vouros James G.
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