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COLOR-SHIFTING TONER USING WILKINSON'S CATALYST

IP.com Disclosure Number: IPCOM000027374D
Original Publication Date: 1996-Jun-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 111K

Publishing Venue

Xerox Disclosure Journal

Abstract

Wilkinson's catalyst of the chemical formula RhCl (PPh&, is a compound which is red in its monomer -form and may dimerize to halogen-based species with an orange color. Under exposure to molecular hydrogen, the compound rapidly becomes yellow by forming a cis-dihydridorhodium @I) complex. The compound is specifically mentioned in NAS A TECH BRIEF , Volume 17, No. 10, Item #15 from Jet Propulsion Laboratory New Technology Report NPO-18730 for use in a paint or spray form to indicate corrosion on metallic surfaces. Corrosion in outside atmosphere is a known source of small amounts of molecular hydrogen as part of the reaction.

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XEROX DISCLOSURE JOURNAL

COLOR-SHIFTING TONER USING Proposed Classification WILKINSON'S CATALYST U. S. C1.3551328 Jeffrey L. DeBarr
15/04 Int. Katherine N. O'Brien C1. G03g

Wilkinson's catalyst of the chemical formula RhCl (PPh&, is a compound which is red in its monomer -form and may dimerize to halogen-based species with an orange color. Under exposure to molecular hydrogen, the compound rapidly becomes yellow by forming a cis-dihydridorhodium @I) complex. The compound is specifically mentioned in NAS A TECH BRIEF , Volume 17, No. 10, Item #15 from Jet Propulsion Laboratory New Technology Report NPO-18730 for use in a paint or spray form to indicate corrosion on metallic surfaces. Corrosion in outside atmosphere is a known source of small amounts of molecular hydrogen as part of the reaction.

Disclosed is the use of Wilkinson's catalyst as a colorant in toner or ink. This allows any color toner between red and yellow to be made using the same set of raw materials by the addition of varying amounts of hydrogen. The hydrogen could be introduced in a gaseous air stream or as a product fiom a controlled chemical reaction. The color produced would be affected by the amount of hydrogen, as well as the type of binder resin and method of dispersing the colorant. The Wilkinson's catalyst can dimerize to orange at higher temperatures, such as in an extruder, but should return to red after cooling because of the equilibrium reaction.

Potential uses are numerous. For a highlight color toner, the particular shade desired could be made in the production plant, distribution, or in te machine itself. The simplified manufacturing strategy makes it easier to manufacture the exact amount of toner desired by the customer. For a process color copier or printer, the color could also be adjusted right in the machine, with one toner potentially replacing two toners (Mag...