Toner for electrophotography and process for the production thereof
AssigneesShimadu Corporation, Tomoegawa Paper Co., Ltd.
InventorsHideyuki Kubota, Eiichi Ozeki
Life of this patent
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Abstract
A biodegradable or hydrolyzable toner for electrophotography, which permits the easy reclaiming and recycling of used copying paper, permits the easy deinking by an existing deinking system, can decrease environmental pollution caused by a toner waste, and has excellent toner properties owing to the uniform dispersion of additives, the toner containing, as a binder resin, a lactic acid-based resin of the formula (1), H--[--O--CH(CH.sub.3)--CO--].sub.n --OR (1) wherein R is an alkali metal or an alkaline earth metal, and n is an integer of 10 to 20,000.
Claims8
A toner for electrophotography, which contains, as a binder resin, a lactic acid-based resin of the formula (1),
- H--[--O--CH(CH.sub.3)--CO--].sub.n --OR (1)
- wherein R is an alkali metal or an alkaline earth metal, and n is an integer of 10 to 20,000.
A toner for electrophotography, which contains, as a binder resin, a lactic acid-based resin of the formula (1),
- H--[--O--CH(CH.sub.3)--CO--].sub.n --OR (1)
- wherein R is an alkali metal or an alkaline earth metal, and n is an integer of 10 to 20,000,
- said resin being produced by bulk-polymerizing lactic acid in the presence of at least one additive selected from the group consisting of a colorant, a charge control agent and an offset preventer,
- said toner being produced by heat-melting and kneading said resin or a mixture of said resin with at least one additive selected from the group consisting of a colorant, a charge control agent and an offset preventer, and pulverizing the kneaded resin or mixture and classifying the pulverized resin or mixture.
Dependencies are inferred from the claim text.