C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 220/00 (2006.01) C08F 220/44 (2006.01) C09D 5/02 (2006.01) C09D 125/14 (2006.01) C09D 133/00 (2006.01) C09D 133/06 (2006.01)
Patent
CA 2064866
2064866 9102775 PCTABS00003 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 ot water, 50 % ethanol, and alkali. The polymer comprises about 20 to about 40 weight percent of a soft monomer whose homopolymer has a Tg of less than about -20 ·C and about 60 to about 80 weight percent of a mixture of hard monomers each of whose homopolymer has a Tg of greater than about 30 ·C. As part of the hard monomer component 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 Tg of about 25· to about 60 ·C, an actual Tg of about 30· to about 70 ·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.
Biale John
Gowling Lafleur Henderson Llp
Rohm And Haas Company
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