GB534152A - Improvements in and relating to alkali soluble cellulose ethers - Google Patents
Improvements in and relating to alkali soluble cellulose ethersInfo
- Publication number
- GB534152A GB534152A GB2440639A GB2440639A GB534152A GB 534152 A GB534152 A GB 534152A GB 2440639 A GB2440639 A GB 2440639A GB 2440639 A GB2440639 A GB 2440639A GB 534152 A GB534152 A GB 534152A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- alkali
- salt
- water
- 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
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
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)
- Coloring (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
534,152. Cellulose ethers. REICHEL, F. H. Aug. 24, 1939, No. 24406. [Class 2 (ii)] Cellulose ethers are obtained by treating cellulosic material with alkali solution and then subjecting it to the action of an etherifying agent in the presence of a substantial amount of an anhydrous water-soluble inert salt capable of forming hydrates. with water, continuing the reaction until there are introduced into the cellulose sufficient ether groups to render the cellulose ether soluble at 0‹C. in aqueous sodium hydroxide solutions of 3 per cent. or less alkali concentration but insoluble in water, and thereafter discontinuing the reaction. The amount of water-soluble inert salt may be sufficient to combine with all the water present in forming the lowest hydrate of the salt. The salt used may be sodium sulphate, sulphite, carbonate, tetraborate, acetate, or citrate, or potassium carbonate, citrate. lactate, or tetraborate, or lithium acetate, tetraborate, or citrate. The cellulosic material may be cotton, jute, flax, hemp, straw, wood, sulphite cellulose, cotton linters, regenerated cellulose, de-esterified cellulose esters, hydrocellulose, or cellulose ethers of low degree of substitution. Caustic soda, caustic potash, or a quaternary ammonium hydroxide may be used for making the alkali-cellulose. The etherifying agent may be an alkyl halide or sulphate, sodium ethyl sulphate, a chlorohydrin, an alkylene oxide, or halogenated fatty acid. The anhydrous salt may be added at any stage prior to the etherification step. A further amount of the salt may be added to the washing liquids. In an example, pulp sheets made of cotton linters are soaked in caustic soda solution, drained and pressed. After ageing, the alkali cellulose is mixed with anhydrous sodium sulphate whereby the quantity of free water in the mixture is reduced and the alkali is concentrated. Ethylene oxide is then added and the mixture is kept-in motion by revolving the reaction vessel for several hours. The product is acidified and washed. The reaction is carried out so that the cellulose ether contains at least 2 per cent, of hydroxy-ethyl or its equivalent of another ether group. The product may be mixed with viscose, ammoniacal-copper solutions of cellulose, latex, aqueous artificial dispersions of rubber, gums, resins, casein, gelatine, waxes, fats, and oils. To the dilute alkali solutions of the cellulose ethers there may be added plasticizers, dyes, pigments, wetting agents, waterproofing, or fireproofing agents. The cellulose ethers may be used in the production of filaments, films, tubes, capsules, plastic masses, adhesives, stiffening agents for fabrics, coatings, sizings for textiles and paper, and they may be used as thickening and dispersing agents for pigments and dyes for printing and dyeing textiles and paper. Specification 496,122 is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2440639A GB534152A (en) | 1939-08-24 | 1939-08-24 | Improvements in and relating to alkali soluble cellulose ethers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2440639A GB534152A (en) | 1939-08-24 | 1939-08-24 | Improvements in and relating to alkali soluble cellulose ethers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB534152A true GB534152A (en) | 1941-02-28 |
Family
ID=10211241
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2440639A Expired GB534152A (en) | 1939-08-24 | 1939-08-24 | Improvements in and relating to alkali soluble cellulose ethers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB534152A (en) |
-
1939
- 1939-08-24 GB GB2440639A patent/GB534152A/en not_active Expired
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