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:
Aug. 04, 1998
Filed:
Feb. 22, 1996
Josef Weichmann, Pleiskirchen, DE;
Franz Wolfertstetter, Wonneberg, DE;
Herbert Winkelmann, Garching, DE;
Alfred Kern, Kirchweidach, DE;
SKW Trostberg Aktiengesellschaft, Trostberg, DE;
Abstract
Disclosed is a highly viscous condensation product containing sulfonic acid groups based on amino-s-triazines with at least 2 amino groups and formaldehyde which has a viscosity of 500 to 100,000 cp at 20.degree. C. and a pH value of 8.0 to 13.0 as an aqueous solution with a solids content of 20% by weight. The product is obtainable by (a) condensation of amino-s-triazine, formaldehyde and sulfite in a molar ratio of 1:1.9 to 2.9:0.7 to 1.3 in aqueous solution at a pH value of 9.0 to 12.0 and a temperature of 50.degree. to 90.degree. C. until the sulfite is no longer detectable, and (b) subsequent further condensation at a pH value of 2.0 to 5.0 and a temperature of 50.degree. to 100.degree. C. until the viscosity exhibits the desired value.