Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1991-11-22
1993-09-07
Martin, Roland
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430110, 430111, G03G 9087
Patent
active
052427773
ABSTRACT:
A toner binder for electrophotography is provided whose minimum fixing temperature is low, image offsetting temperature to the heat-roll is high, and whose stability upon storage is good.
The toner binder comprises a thermoplastic resin (I) of 10 to 50% by weight, i.e., a copolymer having a structural unit consisting of a styrene series monomer and a (meth)acrylic monomer, having a molecular weight of more than 30,000 when fractionated by gel permeation chromatography, having a glass transition temperature of -20.degree. to +40.degree. C.; and a thermoplastic resin (II) of 10 to 50% by weight, i.e., a polymer selected from a copolymer (II-a) of a vinyl monomer selected from group consisting of styrene and substituted styrenes, a copolymer (II-b) having a structural unit consisting of styrene series monomers and (meth)acrylic monomers, polyester resin (II-c), and a copolymer (II-d) including a moiety of a copolymer (II-b) and a moiety of a polyester resin (II-c). The toner binder has a molecular weight up to 30,000 when fractionated by gel permeation chromatography, and a glass transition temperature of 50.degree. to 100.degree. C. These thermoplastic resins are blended to exhibit a difference of 25.degree. to 100.degree. C. between the respective glass transition temperatures thereof.
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Kato Tomohisa
Niinae Takashi
Ochiai Shigeo
Martin Roland
Sanyo Chemical Ind., Ltd.
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