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:
Jan. 03, 2012
Filed:
Nov. 26, 2008
Weiguo Cheng, Naperville, IL (US);
Jun LI, Huangshi, CN;
Yulin Zhao, New District Suzhou, CN;
Qing Long Rao, Jiangsu, CN;
Weiguo Cheng, Naperville, IL (US);
Jun Li, Huangshi, CN;
Yulin Zhao, New District Suzhou, CN;
Qing Long Rao, Jiangsu, CN;
Nalco Company, Naperville, IL (US);
Abstract
The invention provides a method of producing paper with a higher proportion of mineral filler particles than is otherwise be possible without the expected loss in paper strength. The method allows for the use of the greater amount of filler particles by coating at least some of the filler particles with a material that prevents the filler materials form adhering to a strength additive. The strength additive holds the cellulose fibers together tightly and is not wasted on the filler particles. The method is particularly effective when the filler particles are a PCC-GCC blend and when the GCC particles are coated with the adherence preventing coating.