GB840319A - Cellulose esters - Google Patents
Cellulose estersInfo
- Publication number
- GB840319A GB840319A GB38070/56A GB3807056A GB840319A GB 840319 A GB840319 A GB 840319A GB 38070/56 A GB38070/56 A GB 38070/56A GB 3807056 A GB3807056 A GB 3807056A GB 840319 A GB840319 A GB 840319A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- lower aliphatic
- treated
- methylene chloride
- proportion
- 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
- C08B3/00—Preparation of cellulose esters of organic acids
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
In the manufacture of cellulose esters of lower aliphatic acids, cellulose is treated with an esterifying medium comprising the appropriate aliphatic acid anhydride, methylene chloride, sulphuric acid and a minor proportion (based on the esterification mixture as a whole) of the lower aliphatic acid corresponding to the anhydride. Lower aliphatic acids are defined as those containing up to 4 carbon atoms per molecule. Cellulose from any suitable source, e.g. wood pulp or cotton linters, may be treated and is preferably given a pretreatment, e.g. with 20-100% by weight of one or more lower aliphatic acids. After pretreatment the cellulose may be treated with a mixture comprising 750-5000% of methylene chloride, 3-15% of sulphuric acid and a proportion of acid anhydride in molar ratio between 4.3 and 16.2 with respect to the cellulose (reckoned as one anhydroglucose unit), together with the appropriate lower aliphatic acid, preferably in a proportion of 10-50%, based on the methylene chloride. Examples describe the preparation of cellulose acetate. Subsequently the ester may be hydrolysed or ripened or precipitated from solution by addition of a non-solvent.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US840319XA | 1955-12-13 | 1955-12-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB840319A true GB840319A (en) | 1960-07-06 |
Family
ID=22182453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB38070/56A Expired GB840319A (en) | 1955-12-13 | 1956-12-13 | Cellulose esters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB840319A (en) |
-
1956
- 1956-12-13 GB GB38070/56A patent/GB840319A/en not_active Expired
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