Fluorescent whitening of paper

Details Fluorescent whitening of paper Fluorescent whitening of paper

D - Textiles, Paper

21

H

D21H 21/30 (2006.01) D21H 17/09 (2006.01) D21H 19/46 (2006.01) D21H 17/72 (2000.01)

Patent

CA 2123054

Accordingly, the present invention provides a method for the fluorescent whitening of paper comprising contacting the paper surface with a coating composition comprising a fluorescent whitening agent having the formula: (see formula 1) wherein M is hydrogen, an alkali metal, preferably sodium, ammonium or magnesium; or comprising contacting the paper in the size press with a combination of the compound of formula (1) and an auxiliary selected from a sequestering agent and a dispersing agent and/or an emulsifier.

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