Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1984-06-06
1985-06-11
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...
430115, 430904, G03G 912
Patent
active
045229082
ABSTRACT:
A liquid electrophoretic developer composition suitable for rendering visible electrostatically charged areas, which composition contains in an electrically insulating non-polar organic carrier liquid having a volume resistivity of at least 10.sup.9 ohm.cm and a dielectric constant less than 3, pigment particles carrying at least one substance conferring electric charges on said particles, dispersed with the aid of a block copolymer containing one adsorbent group A and at least one solvatable group B, characterized in that said group A represents a polystyrene chain having a number average molecular weight of at least 2,000, and said group B represents a polymethacrylate fatty alcohol ester chain having a number average molecular weight of at least 7,000. The adsorption of said block copolymer to pigment particles is illustrated in FIG. 1.
REFERENCES:
patent: 3933667 (1976-01-01), Machida et al.
De Volder Noel J.
De Winter Walter F.
Gilliams Yvan K.
Uytterhoeven Herman J.
AGFA-GEVAERT N.V.
Daniel William J.
Welsh John D.
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