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:
Jul. 22, 1997
Filed:
Jun. 24, 1996
T Hwee Ng, Mississauga, CA;
Arthur Helbrecht, Oakville, CA;
Raj D Patel, Oakville, CA;
Michael A Hopper, Toronto, CA;
Richard P Veregin, Mississauga, CA;
Xerox Corporation, Stamford, CT (US);
Abstract
A process for the preparation of toner comprising: (i) preparing a pigment dispersion, which dispersion is comprised of a pigment, an ionic surfactant, and optionally a charge control agent; (ii) shearing said pigment dispersion with a latex or emulsion blend comprised of resin, a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant and a nonionic surfactant; (iii) heating the above sheared blend below about the glass transition temperature (Tg) of the resin to form electrostatically bound toner size aggregates with a narrow particle size distribution; (iv) heating said bound aggregates above about the Tg of the resin; and (v) thereafter washing the toner obtained, adding initiator, adding monomer, polymerizing by heating, and thereafter cooling, followed by an optional second washing.