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:
Jul. 15, 2014
Filed:
Nov. 01, 2012
Weiguo Cheng, Naperville, IL (US);
Katherine M Broadus, Aurora, IL (US);
Dorota Smoron, Hoffman Estates, IL (US);
Shawnee M Wilson, Downers Gove, IL (US);
Weiguo Cheng, Naperville, IL (US);
Katherine M Broadus, Aurora, IL (US);
Dorota Smoron, Hoffman Estates, IL (US);
Shawnee M Wilson, Downers Gove, IL (US);
Nalco Company, Naperville, IL (US);
Abstract
A method of preparing a stable dispersion of flocculated filler particles for use in papermaking processes comprises use of microparticle prior to, simultaneous to, and/or after addition of a first flocculating agent to an aqueous dispersion of filler particles, followed by addition of a second flocculating agent to the dispersion and further optional shearing of the resultant filler flocs to the desired particle size resulting in shear resistant filler flocs with a defined and controllable size distribution. In addition, a neutralizing coagulant can be added to the dispersion to partially or completely neutralize the charge of the filler before the microparticle and/or the first flocculating agent is added.