GB948016A - Acetals of dialdehyde polysaccharides - Google Patents
Acetals of dialdehyde polysaccharidesInfo
- Publication number
- GB948016A GB948016A GB2375761A GB2375761A GB948016A GB 948016 A GB948016 A GB 948016A GB 2375761 A GB2375761 A GB 2375761A GB 2375761 A GB2375761 A GB 2375761A GB 948016 A GB948016 A GB 948016A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acetal
- degree
- dialdehyde polysaccharide
- isopropanol
- toluene
- 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
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B31/00—Preparation of derivatives of starch
- C08B31/18—Oxidised starch
- C08B31/185—Derivatives of oxidised starch, e.g. crosslinked oxidised starch
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B33/00—Preparation of derivatives of amylose
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
An acetal is produced by the interaction of a dialdehyde polysaccharide, having a degree of oxidation of at least 75% and a stoichiometric excess of methanol or ethanol (assuming no cross-linking) in the presence of sulphuric or p-toluene-sulphonic acid as catalyst. A 40% aqueous sulphuric acid solution may be employed. The dialdehyde polysaccharide may be derived from maize, wheat, potato, rice, or tapioca starch, amylose, dextran, algin, inulin, or cellulose. It preferably has a degree of oxidation of at least 89%. 20-70 moles of alcohol and 0.04-0.1 mole of catalyst per mole of dialdehyde polysaccharide polymer unit are preferably employed. The reaction may be carried out at a temperature of 60-100 DEG C. a pressure of 1 atmos. to 30 lb./sq.inch, and a period of 1-20 hrs. The degree of conversion to methyl and ethyl acetal may be 32.5 and 29.5% respectively. The acetal may be precipitated from solution in excess reactant alcohol with isopropanol or a mixture of isopropanol and water. The acetal is soluble in benzene, toluene, ethylene glycol monoethyl and monobutyl ether, acetone, methyl ethyl ketone, propyl acetate, chloroform, dimethylformamide, and dioxane.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4013160A | 1960-07-01 | 1960-07-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB948016A true GB948016A (en) | 1964-01-29 |
Family
ID=21909280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2375761A Expired GB948016A (en) | 1960-07-01 | 1961-06-30 | Acetals of dialdehyde polysaccharides |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE605622A (en) |
| CH (1) | CH402832A (en) |
| DE (1) | DE1172656B (en) |
| GB (1) | GB948016A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105524182A (en) * | 2014-09-28 | 2016-04-27 | 上海东升新材料有限公司 | Modification method for starch, modified starch and application in degradable plastics |
-
1961
- 1961-06-30 DE DEM49542A patent/DE1172656B/en active Pending
- 1961-06-30 BE BE605622A patent/BE605622A/en unknown
- 1961-06-30 GB GB2375761A patent/GB948016A/en not_active Expired
- 1961-07-01 CH CH773461A patent/CH402832A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105524182A (en) * | 2014-09-28 | 2016-04-27 | 上海东升新材料有限公司 | Modification method for starch, modified starch and application in degradable plastics |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1172656B (en) | 1964-06-25 |
| CH402832A (en) | 1965-11-30 |
| BE605622A (en) | 1961-10-16 |
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