USING WHITENING PIGMENTS IN COMPOSITIONS FOR COATING PAPER COVER Russian patent published in 2005 - IPC

FIELD: organic chemistry, paper industry.

SUBSTANCE: invention relates to compositions used for coating paper covers. Invention describes a composition for coating paper cover comprising whitening pigment comprising: (a) product of melamine formaldehyde or phenol-formaldehyde polycondensation, and (b) water-soluble fluorescent whitening agent of the formula:

wherein R₁ and R₂ represent independently of one another -OH, -Cl, -NH₂, -O-(C₁-C₄)-alkyl, -O-aryl, -NH-(C₁-C₄)-alkyl, -N-(C₁-C₄-alkyl)₂, -N-(C₁-C₄)-alkyl-(C₁-C₄-hydroxyalkyl)- -N-(C₁-C₄-hydroxyalkyl)₂ or -NH-aryl, for example, anilino-, anilinemono- or disulfonic acid or aniline sulfone amide, morpholino-, -S-(C₁-C₄)-alkyl(aryl) or radical of amino acid, for example, aspartic acid or iminoacetic acid that is replaced with radical in amino-group; M means hydrogen, sodium, potassium, calcium, magnesium atom or ammonium, mono-, di-, tri- or tetra-(C₁-C₄)-alkylammonium, mono-, di- or tri-(C₁-C₄)-hydroxyalkylammonium, or ammonium di- or tri-substituted with a mixture of (C₁-C₄)-alkyl and (C₁-C₄)-hydroxyalkyl groups. Covers prepared on coating paper elicit high photostability and enhanced whiteness degree.

EFFECT: improved method for preparing, improved properties of covers.

7 cl, 1 tbl, 3 ex