COHESIVE TRANSFER AND FIXING PROCESS
Original Publication Date: 1979-Apr-30
Included in the Prior Art Database: 2004-Apr-01
Xerox Disclosure Journal
Disclosed is the use of polyester resins (commerically available from EJ. du Pont de Nemours & Company) for the purpose of coating toner particles and coating a transfer sheet, such as Mylar, such polyesters being self-adhesiveand non-tackyin nature. Natural and synthetic rubbers, chlorinated, chlorosulfonated polyethylene and silicone elastomers can be used in place of the polyester resins. Thus, for example, the adhesive transfer of particulate images from a photoreceptor, such as selenium, to a support, such as film or paper, is more easily accomplished and a stronger bond is formed between the two surfaces when coated with the materials mentioned above. Heat is not needed and only very slight pressure is required for the formation of a bond. In one embodiment, dry or liquid toner particles containing a polyester were used together with a transfer sheet, such as Mylar, also coated with a polyester, the purpose of the transfer sheet being to "pick off" the toner particles. In one illustrative example, polyvinyl chloride toner particles with a surface coating of a polyester (commerically available from E.I. du Pont de Nemours & Company) were dispersed in an Isopar G material (commerically available from Humble Oil and Refining Company) resulting in the formation of negatively charged liquid developer. The toner particles were prepared from Exxon 470 PVC (commerically available from Firestone and Peerless) and 155 Carbon Black (commerically available from Columbia Ribbon Company) by first dissolving the Exxon 470 PVC in the polyester resin and methyl ethyl ketone, followed by milling in the 155 Carbon Black. To this dispersion was added incrementally small quantities of a nonsolvent. Subsequently, the slurry was poured out on a glass plate and left to dry. The dry powder was then dispersed in Isopar G or a Freon by milling, and the resulting material was then ready for use.