ACID-CONTAINING A-B BLOCK COPOLYMERS AS GRINDING AIDS IN LIQUID ELECTROSTATIC DEVELOPER PREPARATIONS

36 IM-0149 TITLE ACID-CONTAINING A-B BLOCK COPOLYMERS AS GRINDING AIDS IN LIQUID ELECTROSTATIC DEVELOPER PREPARATION Process for the preparation of toner particles for electrostatic liquid developers comprising (A) dispersing at ambient temperature colorant, A-B diblock polymer grinding aid as descr...

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Bibliographic Details
Main Authors EL-SAYED, LYLA M, PAGE, LORETTA A. G
Format Patent
LanguageEnglish
French
Published 08.09.1991
Edition5
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:36 IM-0149 TITLE ACID-CONTAINING A-B BLOCK COPOLYMERS AS GRINDING AIDS IN LIQUID ELECTROSTATIC DEVELOPER PREPARATION Process for the preparation of toner particles for electrostatic liquid developers comprising (A) dispersing at ambient temperature colorant, A-B diblock polymer grinding aid as described, and a carrier liquid; (B) adding to the dispersion a thermoplastic resin and dispersing at an elevated temperature to plasticize and liquify the resin; (C) cooling the dispersion as described while grinding with particulate media, (D) separating the dispersion of toner particles average by area particle size less than 10 .mu.m, from the particulate media, and (E) adding during or subsequent to step (B) at least one ionic or zwitterionic charge director compound. Steps (A) and (B) can be combined by adding the thermoplastic resin to the other ingredients and dispersing at an elevated temperature. The liquid developer can be prepared more quickly by the process than by other known processes. The liquid developers are useful in copying, in making color proofs, etc. 36
Bibliography:Application Number: CA19912036696