GB662351A - Process for the production of polyvinyl alcohol - Google Patents
Process for the production of polyvinyl alcoholInfo
- Publication number
- GB662351A GB662351A GB4182/49A GB418249A GB662351A GB 662351 A GB662351 A GB 662351A GB 4182/49 A GB4182/49 A GB 4182/49A GB 418249 A GB418249 A GB 418249A GB 662351 A GB662351 A GB 662351A
- Authority
- GB
- United Kingdom
- Prior art keywords
- polyvinyl alcohol
- polyvinyl
- alcoholysis
- ester
- methanol
- 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
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/12—Hydrolysis
Abstract
Polyvinyl alcohol is prepared by the alcoholysis with excess methanol of a solid, finely-divided polyvinyl ester of an unsubstituted lower aliphatic monocarboxylic acid, such as polyvinyl formate, acetate, propionate, or butyrate, under vigorous agitation in the presence of an alkaline catalyst, such as sodium or potassium hydroxide or alcoholate, and a liquid solvent modifier, such as oil of turpentine, petroleum fractions, and coal tar naphthas freed from benzene and toluene, which is at least partially miscible with methanol, and in which the polyvinyl alcohol is insoluble and the polyvinyl ester is not more than sparingly soluble; the volume ratio of methanol to liquid solvent modifier is within the range of 20 : 1 to 0.2 : 1, the ratio being such that the rate of solution of the polyvinyl ester in the mixture is less than the rate of alcoholysis. The process is preferably carried out at room temperature, either batchwise or continuously, and the polyvinyl alcohol may be separated from the alcoholysis medium by filtration or centrifuging to provide a polyvinyl alcohol of low ester content which gives a clear solution when dissolved in water. Specification 512,001 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA662351X | 1948-02-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB662351A true GB662351A (en) | 1951-12-05 |
Family
ID=4172107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4182/49A Expired GB662351A (en) | 1948-02-19 | 1949-02-16 | Process for the production of polyvinyl alcohol |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE842408C (en) |
| FR (1) | FR994168A (en) |
| GB (1) | GB662351A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1002527B (en) * | 1953-04-30 | 1957-02-14 | Du Pont | Process for the production of polyvinyl alcohol |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE963194C (en) * | 1953-05-13 | 1957-05-02 | Wacker Chemie Gmbh | Process for the production of polyvinyl alcohol |
| NL188174B (en) * | 1953-06-15 | Sun Carpet Co Ltd | DEVICE FOR MANUFACTURING EMBROIDERED CARPETS. | |
| DE1042237B (en) * | 1955-04-06 | 1958-10-30 | Wacker Chemie Gmbh | Process for the production of polyvinyl alcohol |
-
1949
- 1949-01-28 FR FR994168D patent/FR994168A/en not_active Expired
- 1949-02-16 GB GB4182/49A patent/GB662351A/en not_active Expired
-
1950
- 1950-10-01 DE DES20032A patent/DE842408C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1002527B (en) * | 1953-04-30 | 1957-02-14 | Du Pont | Process for the production of polyvinyl alcohol |
Also Published As
| Publication number | Publication date |
|---|---|
| DE842408C (en) | 1952-06-26 |
| FR994168A (en) | 1951-11-13 |
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