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:
Apr. 20, 2021
Filed:
May. 31, 2017
Applicant:
Ecolab Usa Inc., St. Paul, MN (US);
Inventors:
Assignee:
ECOLAB USA INC., St. Paul, MN (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
D21H 21/18 (2006.01); D21H 17/37 (2006.01); D21H 17/45 (2006.01); D21H 17/66 (2006.01); D21H 17/00 (2006.01);
U.S. Cl.
CPC ...
D21H 21/18 (2013.01); D21H 17/37 (2013.01); D21H 17/375 (2013.01); D21H 17/455 (2013.01); D21H 17/66 (2013.01); D21H 17/74 (2013.01);
Abstract
A method of enhancing paper strength properties is provided. The method comprises treating a paper sheet precursor with a polyaluminum salt, and a strengthening agent, wherein the strengthening agent comprises a dialdehyde-modified polyacrylamide copolymer and a polyacrylamide copolymer. The polyaluminum salt may be polyaluminum chloride. The methods have been demonstrated to provide, among other things, improvements in retention, strength, and dewatering.