Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1981-01-08
1982-12-07
Welsh, John D.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
4301066, G03G 1309
Patent
active
043628036
ABSTRACT:
Disclosed is a one-component type magnetic developer for development of positively charged images and transfer of developed images, which comprises particles of a composition comprising a finely divided magnetic material dispersed in a binder medium comprising a vinyl aromatic polymer or acrylic polymer in an amount of 45 to 95% by weight based on the magnetic material, said particles of the magnetic material having a bulk density of at least 0.42 g/ml, a number average maximum size of 0.35 .mu.m as measured by an electron microscope and a maximum size/minimum size ratio of from 1.0 to 5.5, especially from 1.0 to 3, wherein said composition further comprises an aliphatic carboxylic acid having a total carbon number (inclusive of the carbon atom of the carboxyl group) of at least 14 per carboxyl group in an amount of 0.2 to 4% by weight and a negative charge controlling agent consisting of an alcohol-soluble metal-containing dye in an amount of 0.5 to 5% by weight based on said polymer.
This magnetic developer provides an excellent transferred image having high image density and image sharpness on a plain paper as a transfer sheet without fogging or broadening of the contour of the image. This image is excellent in reproducibility of fine lines, solid black portions and half tones.
REFERENCES:
patent: 3165420 (1965-01-01), Tomanek et al.
patent: 3556998 (1971-01-01), Steiner
patent: 3781208 (1973-12-01), Ueda et al.
Miyakawa Nobuhiro
Teshima Takashi
Mita Industrial Co. Ltd.
Welsh John D.
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