GB856840A - Process for the manufacture of polyvinyl formals - Google Patents
Process for the manufacture of polyvinyl formalsInfo
- Publication number
- GB856840A GB856840A GB10245/58A GB1024558A GB856840A GB 856840 A GB856840 A GB 856840A GB 10245/58 A GB10245/58 A GB 10245/58A GB 1024558 A GB1024558 A GB 1024558A GB 856840 A GB856840 A GB 856840A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- polyvinyl
- acetic acid
- mixture
- groups
- 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
- C08F8/28—Condensation with aldehydes or ketones
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Polyvinyl formals suitable for electrical insulating purposes, are made by reacting a polyvinyl ester with formaldehyde (or a substance yielding formaldehyde) in an aqueous medium containing 75-80% by weight of acetic acid in the presence of a mixture of a strong mineral acid and a salt of persulphuric acid as hydrolysis and acetalisation catalyst. The preferred polyvinyl ester is polyvinyl acetate obtained by polymerization in glacial acetic acid and the preferred catalyst is a mixture of sulphuric acid and ammonium persulphate. Preferably reaction is effected at 70 DEG -80 DEG C. for 20-25 hours, the reaction mixture then diluted with an aqueous solution of acetic acid of 20-25% strength and then water added to precipitate the product. In the example, the product produced contains about 80% of formal groups, 14% of acetate groups and 6% of hydroxyl groups. Specification 454,691 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE856840X | 1957-03-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB856840A true GB856840A (en) | 1960-12-21 |
Family
ID=6789418
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB10245/58A Expired GB856840A (en) | 1957-03-30 | 1958-03-31 | Process for the manufacture of polyvinyl formals |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB856840A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0319613A1 (en) * | 1987-12-07 | 1989-06-14 | METHANOL CHEMIE NEDERLAND V.o.F. | A process for preparing polymers and their use as stabilizers for aqueous formaldehyde solutions |
EP0319614A1 (en) * | 1987-12-07 | 1989-06-14 | METHANOL CHEMIE NEDERLAND V.o.F. | New polymers, a process of their preparation and their use as stabilizers of aqueous formaldehyde solutions |
-
1958
- 1958-03-31 GB GB10245/58A patent/GB856840A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0319613A1 (en) * | 1987-12-07 | 1989-06-14 | METHANOL CHEMIE NEDERLAND V.o.F. | A process for preparing polymers and their use as stabilizers for aqueous formaldehyde solutions |
EP0319614A1 (en) * | 1987-12-07 | 1989-06-14 | METHANOL CHEMIE NEDERLAND V.o.F. | New polymers, a process of their preparation and their use as stabilizers of aqueous formaldehyde solutions |
WO1989005313A1 (en) * | 1987-12-07 | 1989-06-15 | Methanol Chemie Nederland V.O.F. | New polymers, a process of their preparation and their use as stabilizers of aqueous formaldehyde solutions |
WO1989005312A1 (en) * | 1987-12-07 | 1989-06-15 | Methanol Chemie Nederland V.O.F. | A process for preparing polymers and their use as stabilizers for aqueous formaldehyde solutions |
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