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. 07, 2012
Filed:
Dec. 27, 2006
Hachirou Hirano, Chiba, JP;
Takako Hirano, Legal Representative, Chiba, JP;
Shintaro Kikuchi, Ibaraki, JP;
Fumiaki Nakashima, Ibaraki, JP;
Hisakazu Arima, Ibaraki, JP;
Shigeru Sakurai, Tokyo, JP;
Hachirou Hirano, Chiba, JP;
Takako Hirano, legal representative, Chiba, JP;
Shintaro Kikuchi, Ibaraki, JP;
Fumiaki Nakashima, Ibaraki, JP;
Hisakazu Arima, Ibaraki, JP;
Shigeru Sakurai, Tokyo, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
A process for producing sodium hydrogencarbonate crystal particles having a low caking property, which entails subjecting sodium hydrogencarbonate crystal particles having an average particle size of from 50 to 500 μm based on the mass to heat treatment at a temperature of from 70 to 95° C. by a heating gas having a carbon dioxide gas concentration of at most the concentration calculated by the formula: Carbon dioxide gas concentration=0.071×e×R, where T (° C.) is the temperature of sodium hydrogencarbonate crystals, and R (%) is the relative humidity around the crystals at the temperature of the crystals, provided that the upper limit of the carbon dioxide gas concentration is 100 vol % to form anhydrous sodium carbonate on the surface of the sodium hydrogencarbonate crystal particles with a content of anhydrous sodium carbonate of from 0.03 to 0.4 mass % in the sodium hydrogencarbonate crystals.