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:
Aug. 23, 2005
Filed:
Dec. 04, 2001
Masanobu Nishimine, Tokyo, JP;
Susumu Ueno, Annaka, JP;
Yoichi Tanifuji, Tokyo, JP;
Tomoyoshi Koike, Annaka, JP;
Tomio Iwase, Annaka, JP;
Michiaki Sezai, Annaka, JP;
Masanobu Nishimine, Tokyo, JP;
Susumu Ueno, Annaka, JP;
Yoichi Tanifuji, Tokyo, JP;
Tomoyoshi Koike, Annaka, JP;
Tomio Iwase, Annaka, JP;
Michiaki Sezai, Annaka, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
Particulate silica is prepared by feeding a gas mixture of an organohalosilane gas, a flammable gas capable of generating water vapor when burned, and a free oxygen-containing gas to a reaction chamber through a multiple-tube burner, whereby the organohalosilane is subjected to flame hydrolysis and oxidation reaction. The amount of the flammable gas fed is 0.5-9 mol per mol of the organohalosilane and such that the amount of water vapor resulting from combustion of the flammable gas is 1-6 times the stoichiometric amount, and the gas mixture is fed to the center tube of the burner such that it may have a linear velocity at the outlet of 50-120 m/sec, calculated in the standard state. The resulting silica has a surface area of 100-400 m/g and a narrow particle size distribution of primary particles and ensures the transparency of silicone rubber filled therewith.