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:
Nov. 19, 2013
Filed:
Sep. 01, 2011
Kazuhiro Nakayama, Kitakyushu, JP;
Akira Nakashima, Kitakyushu, JP;
Hiroyasu Nishida, Kitakyushu, JP;
Yoshinori Wakamiya, Kitakyushu, JP;
Kazuhiro Nakayama, Kitakyushu, JP;
Akira Nakashima, Kitakyushu, JP;
Hiroyasu Nishida, Kitakyushu, JP;
Yoshinori Wakamiya, Kitakyushu, JP;
JGC Catalysts and Chemicals Ltd., Kawasaki-Shi, JP;
Abstract
In producing nodular silica sol, a polymerized silicic acid solution with viscosity of silicic acid from 0.9 to 100 mPa·s is prepared by aging a silicic acid solution with pH from 1.0 to 7.0 and silica concentration from 0.05 to 3.0% by weight at a temperature from 1 to 98° C. Then, a seed liquid is prepared by adding an alkali to the polymerized solution to adjust the pH from 10 to 12.5 and heating the resultant mixture solution at a temperature from 50 to 150° C. According to necessity, an alkali is added to the obtained seed liquid to adjust the pH in from 9 to 12.5. Finally, a silicic acid solution or a highly purified silicic acid solution is dropped to the seed liquid at a temperature from 20 to 98° C. continuously or intermittently for building up.