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GB1249814A - Improved process for depolymerizing cellulose ethers - Google Patents

Improved process for depolymerizing cellulose ethers

Info

Publication number
GB1249814A
GB1249814A GB2785169A GB2785169A GB1249814A GB 1249814 A GB1249814 A GB 1249814A GB 2785169 A GB2785169 A GB 2785169A GB 2785169 A GB2785169 A GB 2785169A GB 1249814 A GB1249814 A GB 1249814A
Authority
GB
United Kingdom
Prior art keywords
ether
cellulose ether
cellulose
viscosity
cellulose ethers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2785169A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dow Chemical Co
Original Assignee
Dow Chemical Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dow Chemical Co filed Critical Dow Chemical Co
Publication of GB1249814A publication Critical patent/GB1249814A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B11/00—Preparation of cellulose ethers
    • C08B11/193—Mixed ethers, i.e. ethers with two or more different etherifying groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B1/00—Preparatory treatment of cellulose for making derivatives thereof, e.g. pre-treatment, pre-soaking, activation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B11/00—Preparation of cellulose ethers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B11/00—Preparation of cellulose ethers
    • C08B11/20—Post-etherification treatments of chemical or physical type, e.g. mixed etherification in two steps, including purification
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B15/00—Preparation of other cellulose derivatives or modified cellulose, e.g. complexes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

1,249,814. Depolymerizing cellulose ethers. DOW CHEMICAL CORP. 2 June, 1969 [13 June, 1968], No. 27851/69. Heading C3A. A water-soluble cellulose ether is depolymerized by irradiating a solid water-soluble cellulose ether at 75‹ to 125‹ C. in the presence of oxygen with gamma radiation at a dose rate of 10 to 2000 Krad./hr. The cellulose ether, which may be irradiated in the form of a freeflowing particulate solid, is preferably given a total dose of 1À4 to 2À3 Mrads. of gamma irradiation. In particular, the viscosity of a watersoluble cellulose ether having a 2% by weight aqueous solution viscosity at 20‹ C. of 50- 4000 centipoises is reduced to give an ether with a 2% by weight viscosity of 2-25 centipoises. The cellulose ether may be an alkyl-, carboxyalkyl- or hydroxyalkyl ether, e.g. hydroxypropylmethyl cellulose.
GB2785169A 1968-06-13 1969-06-02 Improved process for depolymerizing cellulose ethers Expired GB1249814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US73670868A 1968-06-13 1968-06-13

Publications (1)

Publication Number Publication Date
GB1249814A true GB1249814A (en) 1971-10-13

Family

ID=24960985

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2785169A Expired GB1249814A (en) 1968-06-13 1969-06-02 Improved process for depolymerizing cellulose ethers

Country Status (3)

Country Link
DE (1) DE1928046A1 (en)
GB (1) GB1249814A (en)
SE (1) SE361888B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002006348A3 (en) * 2000-07-19 2002-05-16 Genzyme Corp Molecular weight reduction of polymer using irradiation treatment

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4061859A (en) * 1976-06-14 1977-12-06 The Dow Chemical Company Viscosity reduction of cellulose derivatives
US4420611A (en) * 1982-03-18 1983-12-13 Hercules Incorporated Stabilization of irradiated carboxymethyl cellulose
CN102690357A (en) * 2012-06-07 2012-09-26 临沂兴大工程有限责任公司 Method for reducing viscosity of cellulose ether

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002006348A3 (en) * 2000-07-19 2002-05-16 Genzyme Corp Molecular weight reduction of polymer using irradiation treatment

Also Published As

Publication number Publication date
DE1928046A1 (en) 1969-12-18
SE361888B (en) 1973-11-19

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