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US 5,314,784 AGranted
Process for detackifying transferred toned images
AssigneeE. I. Du Pont de Nemours and Company
InventorRobert P. Held
Life of this patent
Estimating the term…
Abstract
A process for transferring toned images to an image receptor at low temperatures with improved back transfer characteristics.
Claims5
A process for forming an image from an element having a latent image, said image having toner receptive and background areas, which comprises:
- (a) applying to the latent image of the element a prolonged tack toner to produce a non-tacky toned image;
- (b) heating the toned image to a temperature sufficient to activate the toner by rendering the toner tacky;
- (c) bringing the tacky toned element into intimate contact with an image receptor, and, while the toner is still activated;
- (d) separating the element and image receptor whereby a portion of the activated prolonged tack toner transfers imagewise to the receptor;
- (e) reducing the temperature of the tacky toned image on the image receptor below the activating temperature of the prolonged tack toner wherein the toner remains tacky;
- (f) applying dry particulate prolonged tack toner over the still tacky image on the image receptor to increase the density of the toned transferred image;
- (g) heating the toned image to a temperature sufficient to activate the toner by rendering the toner tacky;
- (h) applying a colorless, fusible, finely divided particulate material to the transferred toned image on the receptor, said particulate material having a melting point greater than the melting point and transfer temperature of the prolonged tack toner;
- and
- (i) heating the transferred toned image on the receptor to a temperature above the melting point of the colorless, fusible, finely divided particulate material.
7 more elements
Dependencies are inferred from the claim text.