Copy paper sheet and method of making the same

Details Copy paper sheet and method of making the same Copy paper sheet and method of making the same

B - Operations, Transporting

41

M

42/16, 117/237,

B41M 5/155 (2006.01)

Patent

CA 1091998

ABSTRACT OF THE DISCLOSURE A copy paper sheet capable of forming a colored image after contact with a master sheet carrying a pattern of a suit- able, weakly colored or colorless dye precursor is prepared on a paper machine from stuff which, in addition to web forming fibers predominantly consisting of cellulose, contains a coll- oidal dispersion of a hydrated clay, or by sizing a web of the fibers on the sizing press of the machine with an aqueous com- position containing the hydrated, colloidal clay. Upon dry- ing of the sheet, the fibers throughout the sheet thickness or at least adjacent the sized surface are substantially com- pletely enveloped by a hydrogel of the clay which develops the color of the dye by interaction with the precursor. For useful color strength, the clay must amount to at least 5% of the weight of the enveloped fibers.

238450

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