The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 28, 2004
Filed:
Feb. 01, 2002
Peter Rohringer, Schönenbuch, CH;
Ciba Specialty Chemicals Corporation, Tarrytown, NY (US);
Abstract
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 R and R are each independently of the other —OH, —Cl, —NH , —O—C -C alkyl, —O—aryl, —NH—C -C alkyl, —N(C -C alkyl) , —N(C -C alkyl)(C -C hydroxyalkyl), —N(C -C hydroxyalkyl) , or —NH—aryl, for example aniline-mono- or -di-sulfonic acid or an anilinesulfon-amide, morpholino, S—C -C alkyl(aryl), or a radical of an amino acid, for example aspartic acid or inimoacetic acid, which radical is substited at the amino group, and M is hydrogen; sodium; potassium; calcium; magnesium; ammonium; mono-, di-, tri- or tetra-C -C alkylammoniun; mono-, di- or tri-C -C hydroxyalkylammonium; or ammonium di- or tri-substitue by a mixture of C -C alkyl and C -C hydroxyalkyl groups, for whitening paper coating compositions.