Fluorescent whitening of paper

Details Fluorescent whitening of paper Fluorescent whitening of paper

1996-05-22

1997-04-22

Lusignan, Michael

Coating processes

Fluorescent or phosphorescent coating

Optical brightening

162158, 162162, 25230121, B05D 506

Patent

active

056227493

ABSTRACT:
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: ##STR1## 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.

REFERENCES:
patent: 3980713 (1976-09-01), Matsunaga et al.
patent: 4339238 (1982-07-01), Pringel et al.
patent: 4364845 (1982-12-01), Fringeli
patent: 4605511 (1986-08-01), Fringeli
patent: 4888128 (1989-12-01), Koll et al.
patent: 5234617 (1993-08-01), Hunter et al.
patent: 5332861 (1994-07-01), Guglielmetti
patent: 5437818 (1995-08-01), Ehlis et al.

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