| 摘要 |
1495428 Electrostatographic toners and developers KONISHIROKU PHOTO INDUSTRY CO Ltd and SEKISUI KAGAKU KOGYO KK 9 April 1975 [10 April 1974] 14507/75 Heading G2H [Also in Division C3] An electrostatographic toner comprises a colourant and a main resin derived from an alpha, beta ethylenic monomer, which polymer has a ratio of weight average molecular weight to number average molecular weight of 3À5 to 40. In examples, the resin is polystyrene, styrene/butyl methacrylate copolymer, styrene/methyl methacrylate/butyl methacrylate copolymer, methyl methacrylate/ butyl methacrylate copolymer, styrene/vinyl toluene copolymer, styrene/acrylonitrile copolymer, styrene/ethyl hexyl acrylate copolymer and styrene/ lauryl methacrylate copolymer. Mixtures of resins may also be used. The carrier used is iron powder.
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