Back to results
US 5,910,387 AGranted
Toner compositions with acrylonitrile and processes
AssigneeXerox Corporation
InventorsWalter Mychajlowskij, Beng S. Ong, Emily L. Moore, Raj D. Patel
Life of this patent
Estimating the term…
Abstract
A toner composition comprised of colorant, and an addition polymer resin of styrene, butadiene, acrylonitrile and acrylic acid.
Claims22
A toner composition comprised of colorant, and an addition polymer resin of styrene, butadiene, acrylonitrile and acrylic acid wherein said resin possesses a weight average molecular weight (Mw) of from about 15,000 to about 35,000 and a number average molecular weight (Mn) of from about 3,000 to about 12,000, relative to styrene standards.
A process for the preparation of toner comprising
- (i) preparing in the presence of an ionic surfactant and an optional nonionic surfactant a latex emulsion generated from the emulsion polymerization of a mixture of from about 55 to about 85 weight percent of styrene, from about 1 to about 25 weight percent of butadiene, from about 1 to about 20 weight percent of acrylonitrile, and from about 0.5 to about 5 weight percent acrylic acid;
- (ii) mixing said latex emulsion with an aqueous colorant dispersion containing an ionic surfactant that is of opposite charge polarity to the ionic surfactant present in said latex emulsion;
- (iii) heating the resultant mixture at a temperature of about 30.degree. C. to about 1.degree. C. about below, or about equal to the Tg of the latex resin to form aggregates;
- (iv) subsequently heating said aggregates at a temperature of from about 10.degree. C. to about 60.degree. C. about above, or about equal to the Tg of the latex resin;
- and optionally
- (v) cooling, and isolating said toner, followed by washing, and drying.
3 more elements
A process for the preparation of toner comprising
- (i) mixing a latex containing styrene, butadiene, acrylonitrile, acrylic acid and an ionic surfactant, and an aqueous colorant dispersion containing an ionic surfactant that is of opposite charge polarity to the ionic surfactant present in said latex emulsion;
- (ii) heating;
- and
- (iii) isolating said toner.
1 more element
Dependencies are inferred from the claim text.