METHOD OF OBTAINING COLORED PAPER Russian patent published in 2013 - IPC D21H21/28 

FIELD: textiles, paper.

SUBSTANCE: invention relates to a method of obtaining colored paper, including the preparation of an aqueous dispersion of cellulose fibers and a natural dye solution - the product of the extraction of larch wood, containing 65-75 wt % quercetine and 25-35 wt % lignin-carbohydrate complex substances, dyeing of the cellulose fibers by their processing with the dye solution with its consumption of 0.5-0.8% of dry substance in reliance on the weight of absolutely dry fiber in dispersion, forming a paper web, which is different in preparing the additional dispersion of fibrillated cellulose fibers, only these fibers are subjected to dyeing, both dispersions are mixed to produce the paper pulp, while the amount of fibrillated cellulose fibers is 5-10 wt % of total amount of cellulose fibers in the paper pulp.

EFFECT: simplification and reduction in the cost of the process of obtaining the colored paper.

2 cl, 4 ex, 1 tbl