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:
Mar. 17, 2015
Filed:
Nov. 15, 2010
Applicants:
Chen LU, Marietta, GA (US);
Vladimir Grigoriev, Atlanta, GA (US);
Scott Rosencrance, Douglasville, GA (US);
Inventors:
Chen Lu, Marietta, GA (US);
Vladimir Grigoriev, Atlanta, GA (US);
Scott Rosencrance, Douglasville, GA (US);
Assignee:
Kemira Oyj, Espoo, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 17/33 (2006.01); D21H 21/18 (2006.01); D21H 17/29 (2006.01); D21H 17/37 (2006.01);
U.S. Cl.
CPC ...
D21H 21/18 (2013.01); D21H 17/29 (2013.01); D21H 17/375 (2013.01);
Abstract
A dry strength additive composition generally includes an anionic and/or amphoteric polyacrylamide having a molecular weight of less than 1,000,000 Daltons, wherein the amphoteric polyacrylamide has a net negative charge; a cationic and/or amphoteric starch; and a cationic non-starch polymer having a charge density greater than 1 milliequivalent per gram (meq/g) at a pH of 3. The components defining the composition can be added to a pulp suspension sequentially or as a pre-blended mixture.