The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 09, 1993
Filed:
Aug. 21, 1989
John Biale, Anaheim, CA (US);
Rohm and Haas Company, Philadelphia, PA (US);
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.