Loretta Ann Grezzo Page
DuPont
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Featured researches published by Loretta Ann Grezzo Page.
Hard Copy and Printing Materials, Media, and Processes | 1990
Loretta Ann Grezzo Page; Lyla Mostafa El-Sayed
AB diblock copolymer additives offer many process and product improvements in liquid electrostatic toners. One area where AB diblocks are superior is as hydrocarbon-soluble charge directors. Unlike conventional charging agents for liquid toners, which are typically natural occurring substances or by-products of the oil industry, these polymers are synthetic, thus can be made reproducibly and pure. Also, their high molecular weights result in very low toxicity vs. nonpolymeric charge directors. In the past, polymeric charge directors for liquid toners have been random copolymers, made from at least two monomers: a polar one to impart charge, and a non-polar one for hydrocarbon solublity. AB diblock copoiymer charge directors have been found to be superior to conventional and random diblock copolymers.1 In random copolymers, the mixing of the polar and nonpolar components dilute the desired charging, resin compatibility, and hydrocarbon solubility of the additives. With AB diblocks, the non-polar and polar segments of the polymer are completely separated, resulting in a sufactant-type structure, which can form inverse micelles with toner particles in hydrocarbon dispersants. Also, since these polymers are grown stepwise, the length and composition of each block can be precisely controlled to optimize for a specific toner. In this work, syntheses of hydrocarbon-soluble AB diblock quaternary ammonium salts and their behavior as negative charge directors in toners are discussed.
Archive | 1998
Kathryn Amy Pearlstine; Loretta Ann Grezzo Page; Robert Paul Held
Archive | 1996
Kathryn Amy Pearlstine; Loretta Ann Grezzo Page
Archive | 1996
Loretta Ann Grezzo Page; Milan Bohuslav Bednarek; Zeying Ma; Keshava Anand Prasad
Archive | 1986
Michael A. Blaustein; Dennis Arthur Nollen; Loretta Ann Grezzo Page
Archive | 1996
Loretta Ann Grezzo Page; Milan Bohuslav Bednarek
Archive | 1999
Loretta Ann Grezzo Page; Kathryn Amy Pearlstine; エイミー パールスティン キャスリン; アン グレッツォ ページ ロレッタ
Archive | 1999
Richard Douglas Bauer; John Morrow San Diego Gardner; Loretta Ann Grezzo Page; David Alvin Tyvoll
Archive | 1996
Loretta Ann Grezzo Page; Harry Joseph Spinelli; Waifong Liew Anton
Macromolecules | 1991
Peter Lang; Harry Joseph Spinelli; Loretta Ann Grezzo Page; Michael Stephen Wolfe; Walther Burchard