G - Physics – 03 – G
Patent
G - Physics
03
G
96/51
G03G 9/08 (2006.01) C08F 112/08 (2006.01) C08F 299/08 (2006.01) G03F 3/10 (2006.01) G03F 7/28 (2006.01)
Patent
CA 2006216
TITLE HUMIDITY-RESISTANT PROOFING TONERS WITH LOW MOLECULAR WEIGHT POLYSTYRENE ABSTRACT OF THE INVENTION This invention concerns a method for color development of a surface having imagewise tacky and nontacky image areas which comprises (a) applying a dry nonelectroscopic toner to the image-bearing surface; (b) distributing the toner particles over the image surface whereby the distributed toner particles become embedded solely in the tacky image areas; and (c) physically removing toner particles from the non-tacky areas which are left substantially free of the toner particles, the improvement wherein high resolution images having higher toned optical density with improved color purity are obtained using a dry nonelectroscopic humidity resistant toner having a size distribution within the range from about 0.2 micron to about 10 microns, not more than 10% of the toner being below 0.5 micron and not more than 10% of the toner being above 5 microns, and the toner consists essentially of a colorant dispersed in an organic resin wherein the resin is a single homogeneous polymer selected from the group consisting of homopolymers of styrene or styrene homologs, and interpolymers thereof, said polymer having a number average molecular weight in the range from about 500 to about 2,000, and said polymer having a softening temperature in the range from about 75°C to about 175°C. In another embodiment, this invention concerns dry, nonelectroscopic humidity resistant toners for producing high resolution images having higher toned optical density with improved color purity.
E. I. Du Pont de Nemours And Company
Matrick Howard
Sim & Mcburney
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