Patent · US Active

Method of increasing filler content in papermaking

US8088250B2 · kind B2 · utility

12Cited by

8References

18Claims

0Family size

Assignee

Nalco Company LLC · US

Inventors

Weiguo Cheng · Naperville, US
Jun Li · Greenville, US
Yulin Zhao · Shanghai, CN
Qing Long Rao · Shanghai, CN

Key dates

Filing date	Nov 26, 2008
Grant date	Jan 3, 2012
Priority date	—
Expiry date	Dec 27, 2029

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02W30/64
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.