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, 2009
Filed:
Mar. 31, 2003
Applicants:
Masanori Kosuga, Chiba, JP;
Masatomi Ogawa, Chiba, JP;
Yoshiaki Koga, Yamaguchi, JP;
Inventors:
Assignees:
Seiko PMC Corporation, Tokyo, JP;
Tokuyama Corporation, Yamaguchi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 11/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The objective of the present invention is to provide a papermaking method that can enhance the retention in the papermaking steps. This invention provides a method including making paper by adding to pulp slurry a silica sol which is prepared through a reaction between an aqueous solution of sodium silicate and a mineral acid, and which has, under a SiOconcentration from 15 to 50 g/L wherein the value of the concentration is shown by [C], a viscosity from 0.12×[C] mPa·s to 15 mPa·s measured at 25° C, and a cationic component and/or an amphoteric component.