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New Patent Issued To Xerox for Toner Process
A patent by the inventors Nosella, Kimberly D. (Mississauga, CA); Agur, Enno E. (Toronto, CA); Qiu, Shigang (Toronto, CA); Zhou, Ke (Oakville, CA), filed on December 9, 2008, was cleared and issued on August 21, 2012, according to news reporting originating from Alexandria, Virginia, by NewsRx correspondents (see also Xerox Corporation).Patent number 8247157 is assigned to Xerox Corporation (Norwalk, CT).
The following quote was obtained by the news editors from the background information supplied by the inventors: "The present disclosure relates to toners suitable for electrostatographic apparatuses and processes for making such toners.
"Toner blends containing crystalline or semi-crystalline polyester resins with an amorphous resin have been recently shown to provide very desirable ultra low melt fusing, which is important for both high-speed printing and lower fuser power consumption. These types of toners containing crystalline polyester have been demonstrated for both emulsion aggregation (EA) toners, and in conventional jetted toners. One issue with the resin emulsions utilized to prepare polyester EA ultra low melt (ULM) toners, prior to preparation of toners therefrom, is the possibility that they may degrade with time. Methods which avoid this degradation remain desirable."
In addition to the background information obtained for this patent, NewsRx journalists also obtained the inventors’ summary information for this patent: "The present disclosure provides processes for producing resin emulsions. The resin emulsions may then be utilized to form toner particles. In embodiments, the pH of the resin emulsion is monitored and adjusted to maintain the pH at a desired level, which may increase the shelf life and stability of the resin emulsion. In embodiments, a process of the present disclosure may include forming a polyester resin emulsion, monitoring the pH of the emulsion, and adding a base to the emulsion to maintain the emulsion at a pH of from about 6.5 to about 8.
"In other embodiments, a process of the present disclosure may include forming a polyester resin emulsion, monitoring the pH of the emulsion, and adding to the emulsion a base such as sodium hydroxide, ammonium hydroxide, potassium hydroxide, lithium hydroxide, beryllium hydroxide, magnesium hydroxide, calcium hydroxide, barium hydroxide, ammonium hydroxide, sodium bicarbonate, lithium bicarbonate, potassium bicarbonate, lithium carbonate, potassium carbonate, sodium carbonate, beryllium carbonate, magnesium carbonate, calcium carbonate, barium carbonate, and combinations thereof, to maintain the emulsion at a pH of from about 6.5 to about 8, wherein adding the base to the emulsion prevents a decrease in the molecular weight of the resin in the emulsion.
"In yet other embodiments, a process of the present disclosure may include forming a polyester resin emulsion, monitoring the pH of the emulsion, adding to the emulsion a base such as sodium hydroxide, ammonium hydroxide, potassium hydroxide, lithium hydroxide, beryllium hydroxide, magnesium hydroxide, calcium hydroxide, barium hydroxide, ammonium hydroxide, sodium bicarbonate, lithium bicarbonate, potassium bicarbonate, lithium carbonate, potassium carbonate, sodium carbonate, beryllium carbonate, magnesium carbonate, calcium carbonate, barium carbonate, and combinations thereof, to maintain the emulsion at a pH of from about 6.5 to about 8, contacting the resin emulsion with at least one surfactant, an optional colorant and an optional wax to form small particles, aggregating the small particles, coalescing the aggregated particles to form toner particles, and recovering the toner particles."
URL and more information on this patent, see: Nosella, Kimberly D.; Agur, Enno E.; Qiu, Shigang; Zhou, Ke. Toner Process. U.S. Patent Number 8247157, filed December 9, 2008, and issued August 21, 2012. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=79&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=3936&f=G&l=50&co1=AND&d=PTXT&s1=20120821.PD.&OS=ISD/20120821&RS=ISD/20120821
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