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. 26, 2005
Filed:
Sep. 20, 2002
Kunio Arai, Sendai, JP;
Tadafumi Ajiri, Sendai, JP;
Hideo Hattori, Nisshin, JP;
Mitsuru Sasaki, Sendai, JP;
Kunio Arai, Sendai, JP;
Tadafumi Ajiri, Sendai, JP;
Hideo Hattori, Nisshin, JP;
Mitsuru Sasaki, Sendai, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Genesis Research Institute, Inc., Nagoya, JP;
Abstract
A method for forming II-type cellulose, which comprises introducing together a slurry having water and a I-type cellulose dispersed therein and water in the state of high temperature and high pressure to a tubular reactor () contacting the I-type cellulose with a hot water in a supercritical state or subcritical state for a predetermined time in the tubular reactor (), to thereby cleave a part of the hydrogen bonds in the I-type cellulose and dissolve the I-type cellulose into the water in a supercritical state or subcritical state, cooling a cellulose solution discharged from the tubular reactor () in a cooler () to room temperature or lower, followed by allowing to stand, to thereby precipitate crystals of II-type cellulose having a molecular weight lower than that of the I-type cellulose, and separating the resultant II-type cellulose from a solvent. The method allows the preparation of pure II-type cellulose by the use of a simple process.