| 摘要 |
<p>1467495 Electrophotographic toners XEROX CORP 28 Oct 1974 [2 Nov 1973] 46433/74 Heading C3P [Also in Division G2] Electrophotographic toner compositions comprise (1) an insulating polymeric material or resin and dispersed therein (2) 5 to 20 weight per cent of furnace carbon black having a surface area of 275 to 800 m.<SP>2</SP>/g., an oxygen content of 3 to 10%, a carbon black structure of 70 to 250 c.c./100 g. DBP and a particle size of 5 to 75 mÁ. The polymeric material or resin may be a polymer of an olefin, styrene, acrylate, methacrylate, acrylonitrile, vinyl chloride, vinyl carbazole, vinyl ether, vinyl ketone, vinyl alcohol or fluoroolefin, or a polyamide, polyester, polyurethane, polypeptide, polysulphide, polycarbonate, polyglycol, casein, cellulose or cellulose ester. The toners may be mixed with conventional carriers to form developers, and examples describe toners comprising furnace blacks and styrene/methyl methacrylate copolymers or polyesters, which are blended with polymer coated steel shot to form developers.</p> |
