Liquid developer and copolymer polarity control agent for use th

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...

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526264, G03G 912

Patent

active

042437369

ABSTRACT:
This invention relates to an improvement in a liquid developer for the development of electrostatic charge images, comprising an electrically insulating carrier liquid in which pigments or dyestuffs, resinous binders, a polarity control agent, and conventional additives are dispersed or dissolved, the improvement that the polarity control agent is a copolymer which is soluble in the carrier liquid and is composed of 1 to 50 percent by weight of N-vinyl-2-pyrrolidone and 50 to 99 percent by weight of a methacrylic acid ester.

REFERENCES:
patent: 2497705 (1950-02-01), Wernitz
patent: 3044873 (1962-07-01), Haas
patent: 3542681 (1970-11-01), Mutaffis
patent: 3993483 (1976-11-01), Maki et al.

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