Patent · US Active

Processes for producing toner by treatment with enzyme

US7476480B2 · kind B2 · utility

1Cited by

1References

18Claims

0Family size

Assignee

Xerox Corporation · US

Inventors

Steven M. Malachowski · East Rochester, US
Amy A. Grillo · Rochester, US
Eugene F. Young · Marietta, US

Key dates

Filing date	Jan 9, 2007
Grant date	Jan 13, 2009
Priority date	—
Expiry date	Sep 22, 2027

Classification

Technology area (CPC G)Physics
CPC primaryG03G9/09733
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Herein is disclosed a process for producing emulsion aggregation toner including (i) adding a base to an emulsion aggregation toner to increase the pH of the toner to from about 7 to about 12; (ii) sieving and filtering the toner; (iii) washing the toner with an enzyme selected from the group consisting of carboxylic ester hydrolase and sulfuric ester hydrolase; (iv) filtering the toner; (v) washing the toner with reverse osmosis or deionized water; and (vi) adding an acid to reduce the pH of the toner to from about 3 to about 8.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.