Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1992-07-29
1993-04-13
McCamish, Marion E.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430904, 525440, G03G 9087, C08F 2000
Patent
active
052022129
ABSTRACT:
A toner composition for electrophotography comprises, as a principal component, a reaction product of a mixture which comprises 20 to 80% by weight of a polyester resin (A) whose number average molecular weight ranges from 1,000 to 5,000, whose glass transition point ranges from 0.degree. to 50.degree. C. , whose OH value ranges from 20 to 60 KOHmg/g and which is prepared by using at least one trifunctional alcohol in an amount of from 2 to 10 mole % on the basis of the total amount of starting raw alcohols consisting of at least one diol and at least one trifunctional alcohol; and 80 to 20% by weight of a polyester resin (B) whose number average molecular weight ranges from 1,000 to 5,000, whose glass transition point ranges from 50.degree. to 90.degree. C. and whose OH value is not more than 5 KOH mg/g, with a diisocyanate. The toner composition has hot-melt properties suitable for rapid copying, for instance, the lower limit of fixing temperature thereof is low and the temperature range within which the toner can be fixed is very wide. Moreover, the toner composition is excellent in resistance to offset, antiblocking properties, resistance to ADF contamination, pulverization properties and quality of images. Thus, the toner composition shows practically excellent quality as a toner composition for electrophotography.
REFERENCES:
patent: 4833057 (1989-05-01), Misawa
patent: 5037715 (1991-08-01), Hagiwara et al.
Hagiwara Kazuo
Hisamatsu Kazuo
Ishikawa Keiichi
Misawa Akira
Shin Masaaki
McCamish Marion E.
Mitsui Toatsu Chemicals Inc.
RoDee C. D.
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