E.i. Dupont De Nemours and Company

Xerox Corporation

Dximaging

Lyla M El-Sayed

Torence J Trout

Loretta Ann Page

James R Larson

Kathryn A Pearlstine

Gregg A Lane

Dominic M Chan

Arthur J Taggi

Sanford M Marcus

Chandrakant B Thanawalla

A positive-working electrostatic liquid developer consisting essentially of (A) a nonpolar liquid having a Kauri-butanol value of less than 30, present in a major amount;(B) thermoplastic resin particles having dispersed therein a quaternary ammonium compound which is substantially insoluble in the nonpolar liquid and is represented by the general formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 may be the same or different and are hydrogen, alkyl of 1 to 40 carbon atoms, aryl of 6 to 30 carbon atoms, and any of the group R.sub.1, R.sub.2, R.sub.3, and R.sub.4 may be joined to form a 5 or 6 membered ring, and A.sup.- is an anion; and (C) a nonpolar liquid soluble ionic or zwitterionic charge director compound. The process of preparation of the electrostatic liquid developer is described. The liquid developers are useful in copying, color proofing including digital color proofing, lithographic printing plates and resists.

Quaternary ammonium compound as charge adjuvants for positive

Positive-working electrostatic liquid developer consisting essentially of

Salts of acid-containing AB diblock copolymers as charge directors for

Process for the preparation of toner particles for electrostatic liquid developers comprising

Acid-containing A-B block copolymers as grinding aids in liquid

Negative-working electrostatic liquid developer consisting essentially of (A) nopolar liquid having Kauri-butanol value less than 30, present in major amount, (B) thermoplastic resin particles having an average particle size by area of less than 10 .mu.m, and (C) an AB diblock copolymer charge director compound as defined. Optionally a colorant and charge adjuvant are present. The process of making the electrostatic liquid developer is described. The electrostatic liquid developer is useful in copying, making proofs including digital color proofs, lithographic printing plates, and resists.

AB diblock copolymers as charge directors for negative electrostatic

A liquid electrostatic developer consisting essentially of

Aromatic nitrogen-containing compounds as adjuvants for electrostatic

A positive-working electrostatic liquid developer consisting essentially of (A) a nonpolar liquid having a Kauri-butanol value of less than 30, present in major amount, (B) thermoplastic resin particles, less than 10 .mu.m average by area particle size, (C) a nonpolar liquid soluble ionic or zwitterionic charge director compound, and (D) a substituted carboxylic acid or salt adjuvant as defined. Component (D) can be present in liquid (A) or dispersed in the resin particles. The process of preparation of the electrostatic liquid developer is described. The liquid developers are useful in copying, color proofing including digital color proofing, lithographic printing plates and resists.

Substituted carboxylic acids as adjuvants for positive electrostatic

Bipolar liquid electrostatic developer consisting essentially of at least one charge director in a nonpolar liquid having dispersed therein two toner particles having opposite charge polarity which comprise at least one thermoplastic copolymer resin. The particle average by area size is less than 10 .mu.m. The ratio of the two toner particles is 5 to 95 and 95 to 5. A process of simultaneous transfer of such developer is included. The developer is useful in copying.

Bipolar liquid electrostatic developer

An electrostatic liquid developer consisting essentially of

Alkylhydroxy benzylpolyamine as adjuvant for electrostatic liquid

Electrostatic liquid developer having improved negative charging characteristics consisting essentially of

Monofunctional amines as adjuvant for liquid electrostatic developers

Positive electrostatic liquid developer consisting essentially of

Organic sulfur-containing compounds as adjuvants for positive

Electrostatic liquid developer consisting essentially of

Glycerides as charge directors for liquid electrostatic developers

Liquid Electrostatic Developer consisting essentially of

Modified liquid electrostatic developer having improved image scratch

Negative-working electrostatic liquid developer having improved charging characteristics consisting essentially of

Quaternaryammonium hydroxide as adjuvant for liquid electrostatic

Negative, liquid electrostatic developer consisting essentially of

Growing community of inventors

West Chester, PA, United States of America

Lyla M El-Sayed