USE OF WHITENING PIGMENTS FOR WHITENING PAPER COATING COMPOSITIONS

• Main Authors: ROHRINGER, PETER, OHREN, STEFAN, WOCKENFUSS, BERND, GRIENENBERGER, MARC, ROGER
• Format: Patent
• Language: English; French
• Published: 15.02.2001
• Edition: 7
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; BLEACHING LEATHER OR FURS; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; CORRECTING FLUIDS; DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS,YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; DYEING LEATHER, FURS, OR SOLID MACROMOLECULAR SUBSTANCES INANY FORM; DYEING OR PRINTING TEXTILES; DYES; FILLING PASTES; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR; HETEROCYCLIC COMPOUNDS; IMPREGNATING OR COATING OF PAPER; INKS; LAUNDERING; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC CHEMISTRY; PAINTS; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; TREATMENT OF TEXTILES OR THE LIKE; TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS,FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS; USE OF MATERIALS AS ADHESIVES; USE OF MATERIALS THEREFOR; WOODSTAINS

The use of whitening pigments comprising (a) a melamine-formaldehyde or phenol-formaldehyde polycondensation product and (b) a water-soluble fluorescent whitening agent of formula (1), wherein R1 and R2 are each independently of the other -OH, -Cl, -NH2, -O-C1-C4alkyl, -O-aryl, -NH-C1-C4alkyl, -N(C1-C4alkyl)2, -N(C1-C4alkyl)(C1-C4hydroxyalkyl), -N(C1-C4hydroxyalkyl)2 or -NH-aryl, for example anilino, aniline-mono- or -di-sulfonic acid or an anilinesulfon-amide, morpholino, S-C1-C4alkyl(aryl), or a radical of an amino acid, for example aspartic acid or iminoacetic acid, which radical is substituted at the amino group, and M is hydrogen; sodium; potassium; calcium; magnesium; ammonium; mono-, di-, tri- or tetra-C1-C4alkylammonium; mono-, di- or tri-C1-C4hydroxyalkylammonium; or ammonium di- or tri-substituted by a mixture of C1-C4alkyl and C1-C4hydroxyalkyl groups, for whitening paper coating compositions. L'invention concerne l'utilisation de pigments blanchissants dans le blanchissement de compositions de couchage du papier, lesdits pigments comprenant (a) un polycondensat à base d'aldéhyde formique de mélamine ou de phénol-formaldéhyde et (b) un agent blanchissant fluorescent correspondant à la formule (1), dans laquelle R1 et R2 représentent, de manière indépendante l'un de l'autre, -OH, -Cl, -NH2, -O-C1-C4 alkyle, -O-aryle, -NH-C1-C4 alkyle, -N(C1-C4 alkyle)2, -N(C1-C4 alkyle)(C1-C4 hydroxyalkyle), N(C1-C4 hydroxyalkyle)2 ou NH-aryle, tels qu'anilino, l'acide aniline-monosulfonique ou disulfonique ou une aniline sulfonamide, morpholino, S-C1-C4 alkyl(aryl), ou un radical d'un acide aminé, tel que l'acide aspartique ou l'acide iminoacétique, ledit radical étant substitué au niveau du groupe amino ; et M représente un groupe hydrogène, sodium, potassium, calcium, magnésium, ammonium, mono-, di-, tri- ou tétra-C1-C4 alkylammonium, mono-, di- ou tri-C1-C4 hydroxyalkylammonium; ou ammonium di- ou tri-substitué par un mélange de groupes alkyle en C1-C4 et hydroxyalkyle en C1-C4.