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. 09, 2002
Filed:
Dec. 22, 1999
Hiroyuki Kono, Shiki, JP;
Kenji Fukunaga, Shinnanyo, JP;
Kenichi Ishizu, Tokuyama, JP;
Yoshinori Tagashira, Shinnanyo, JP;
Tokuyama Corporation, Yamaguchi-ken, JP;
Abstract
Provided is a cationic polymer-modified silica dispersion which comprises silica fine particles having an average particle diameter of less than 200 nm and a cationic polymer and which does not bring about coagulation of the silica particles. The above dispersion which is diluted to a solid concentration of 1.5% by weight is characterized by having a light scattering index (n value) of 2.0 or more. The above dispersion can be produced by oppositely-colliding a mixed solution obtained by mixing silica with a cationic polymer in a polar solvent at a treating pressure of 300 kgf/cm or more or passing it through an orifice under a condition that a pressure difference between the inlet side and the outlet side of the orifice is 300 kgf cm or more.