DEVELOPER POWDER FOR ELECTROSTATIC IMAGES AND PREPARATION OF SUCH POWDER

摘要

1536514 Developer powder for electrostatic images OCE-VAN DER GRINTEN NV 21 Jan 1977 [23 Jan 1976] 02590/77 Heading C3M [Also in Division G2] A one-component powder for developing electrostatic images comprises thermoplastic resin particles (e.g. of styrene/butyl methacrylate copolymers) having incorporated therein one or more quaternary ammonium salts (which may be monomeric or polymeric) which have a solubility in water at 25‹ C. of less than 3% by weight. The salt(s) may be formed in situ during coagulation of an emulsion of the resin. Illustrated salts include polypiperidinium oleate and benzylhexadecyldimethylammonium polyacrylate. The particles may also include colorant or magnetic material.