Methods for producing alkali cellulose and cellulose ether

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United States of America Patent

PATENT NO 9371399
APP PUB NO 20120214981A1
SERIAL NO

13398393

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A degree of polymerization of cellulose ether is accurately controlled, and quality and a manufacturing process of the cellulose ether are stabilized. There is provided a method for producing depolymerized alkali cellulose having a degree of polymerization controlled, comprising at least a step of depolymerizing, in the presence of an oxygen-containing gas flow, alkali cellulose obtained by bringing a pulp into contact with an alkali solution, while measuring feeding and discharging amounts of oxygen in the oxygen-containing gas flow. There is also provided a method for producing cellulose ether, comprising at least a step of adding an etherifying agent to the depolymerized alkali cellulose having a degree of polymerization controlled.

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Patent Owner(s)

Patent OwnerAddress
SHIN-ETSU CHEMICAL CO LTD4-1 MARUNOUCHI 1-CHOME CHIYODA-KU TOKYO 1000005 ?1000005

International Classification(s)

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  • 2012 Application Filing Year
  • C08B Class
  • 536 Applications Filed
  • 239 Patents Issued To-Date
  • 44.59 % Issued To-Date
Click to zoom InYear of Issuance% of Matters IssuedCumulative IssuancesYearly Issuances201220132014201520162017201820192020202120220255075100

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Narita, Mitsuo Niigata-ken, JP 58 162

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Patent Citation Ranking

  • 0 Citation Count
  • C08B Class
  • 0 % this patent is cited more than
  • 9 Age
Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges1161401232101 - 1011 - 2021 - 3031 - 4081 - 900102030405060708090100110120130140150

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11.5 Year Payment $7400.00 $3700.00 $1850.00 Dec 21, 2027