E.i. Dupont De Nemours and Company

Eugene L Grubb

Robert P Held

Howard Matrick

Bohdan Rakoczy

Peter J McCartin

A non-electroscopic prolonged tack toner for transferring toned images to an image receptor at low temperatures with improved back transfer characteristics.

Ultraviolet curable heat activatable transfer toners

Undesired stain is minimized for pearlescent toners, adapted for toning elements having non-tacky and tacky areas that define an image, by including in the toner inert, substantially spherical particles having a particle size of approximately 0.3 to 42 microns and by including a slip-agent surface coating on at least the pearlescent pigment particles, and preferably also on the inert, substantially spherical particles.

Process of color development using pearlescent toners having reduced

Pearlescent toners having reduced stain characteristics

An improved process for preparing negative images from a photohardenable tonable element, wherein the unexposed photohardenable tonable element is tacky in a preselected temperature range, T.sub.1 -T.sub.2, in which temperature range the exposed photosensitive tonable element is nontacky but wherein the exposed element is retackifiable at elevated temperatures above T.sub.2. After imagewise exposure the unexposed areas have a colorless toning material applied to them at a temperature within the range T.sub.1 -T.sub.2 to make them nontacky at temperatures of at least up to T.sub.3, which is greater than T.sub.2. After heating to an elevated temperature above T.sub.2 but less than T.sub.3 the exposed areas have a contrasting toning material applied to them to give a negative or reverse image.

Process for preparing negative images on a positive-type tonable

Fluorescent dry nonelectroscopic toner comprising fluorescent pigmented organic resin particles having a size distribution of 0.2 to 50 micrometers, surface coated with at least 0.1% by weight of silicone oil or fluorocarbon compound, in combination with at least 0.5% by weight of a water soluble, polymeric quaternary ammonium compound as defined. The fluorescent toner is useful in color developing positive- and negative-working photosensitive elements. The toners provide good toning quality and excellent lack of background color, together with stability on aging.

Fluorescent toners surface coated with polymeric quaternary ammonium

Process of preparing dry nonelectroscopic toner comprising pigmented organic resin particles having a size distribution of 0.2 to 30 micrometers, surface coated with at least 0.1% by weight of silicone oil or fluorocarbon compound, in combination with at least 0.5% by weight of a water soluble, polymeric quaternary ammonium compound as defined. The toner is useful in color developing positive- and negative-working photosensitive elements. The toners, particularly magenta and cyan, exhibit high density and excellent stability.

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Colts Neck, NJ, United States of America

Eugene L Grubb