GB621784A - Manufacture of polyvinyl acetal resins - Google Patents
Manufacture of polyvinyl acetal resinsInfo
- Publication number
- GB621784A GB621784A GB19951/45A GB1995145A GB621784A GB 621784 A GB621784 A GB 621784A GB 19951/45 A GB19951/45 A GB 19951/45A GB 1995145 A GB1995145 A GB 1995145A GB 621784 A GB621784 A GB 621784A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid catalyst
- polyvinyl
- ester
- polyvinyl ester
- hydrolysis
- 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 acetal resins having 9-30 per cent residual polyvinyl alcohol are made by adding with vigorous agitation one or more aldehydes containing at least two carbon atoms to a preponderantly aqueous solution of a polyvinyl ester hydrolysed to at least 75 per cent, containing all of the hydrolysed ester to be reacted, in presence of an acid catalyst and absence of a dispersing agent, other than a colloid capable of being converted into the acetal being produced, at below 45 DEG C., continuing agitation while a partially acetalized resin is precipitated, and then maintaining or raising the temperature while continuing agitation until the desired composition of product is obtained. The hydrolysis of the polyvinyl ester may be carried out in presence of an acid catalyst, preferably the same as that used in the acetalization, and is preferably effected within the range 40 DEG to 70 DEG C. Acid corresponding to the polyvinyl ester used may be added to the dispersion before or with the acid catalyst. The hydrolysis of the polyvinyl ester may be carried out continuously by hydrolysing in presence of an acid catalyst to an intermediate stage, replacing part of the solution by further polyvinyl ester dispersion and acid catalyst, repeating the cycle of operations, diluting successive portions of solution removed with water and permitting hydrolysis to proceed to at least 75 per cent, using the same acid catalyst as used in the acetalization. The polyvinyl ester dispersion used may be in the form of beads, flakes or powder of polymer, dispersed in water or produced by polymerization of the monomer in aqueous emulsion. If desired, the acetalized product may be washed with water and then at elevated temperatures, e.g. 70-95 DEG C., with aqueous sodium or potassium hydroxide. Specified aldehydes are acetaldehyde, paraldehyde, butyraldehyde, propionaldehyde and benzaldehyde. Polyvinyl acetate is the preferred ester. Specification 577,861 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA621784X | 1944-08-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB621784A true GB621784A (en) | 1949-04-20 |
Family
ID=4171984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19951/45A Expired GB621784A (en) | 1944-08-19 | 1945-08-03 | Manufacture of polyvinyl acetal resins |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB621784A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2365005A1 (en) * | 1972-12-30 | 1974-07-11 | Sekisui Chemical Co Ltd | METHOD FOR MANUFACTURING POLYVINYL ACETALS |
| DE2838025A1 (en) * | 1977-08-31 | 1979-03-15 | Saint Gobain | METHOD OF MANUFACTURING POLYVINYLBUTYRAL AND ITS APPLICATION |
| US4652604A (en) * | 1985-08-02 | 1987-03-24 | American Hoechst Corporation | Radiation-polymerizable composition and element containing a photopolymer composition |
| US4670507A (en) * | 1985-08-02 | 1987-06-02 | American Hoechst Corporation | Resin |
| US4707437A (en) * | 1985-08-02 | 1987-11-17 | Hoechst Celanese Corporation | Radiation-polymerizable composition and element containing a photopolymer composition |
| US4780392A (en) * | 1985-08-02 | 1988-10-25 | Hoechst Celanese Corporation | Radiation-polymerizable composition and element containing a photopolymerizable acrylic monomer |
| US4822720A (en) * | 1985-08-02 | 1989-04-18 | Hoechst Celanese Corporation | Water developable screen printing composition |
| US4895788A (en) * | 1985-08-02 | 1990-01-23 | Hoechst Celanese Corporation | Water developable lithographic composition |
-
1945
- 1945-08-03 GB GB19951/45A patent/GB621784A/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2365005A1 (en) * | 1972-12-30 | 1974-07-11 | Sekisui Chemical Co Ltd | METHOD FOR MANUFACTURING POLYVINYL ACETALS |
| DE2838025A1 (en) * | 1977-08-31 | 1979-03-15 | Saint Gobain | METHOD OF MANUFACTURING POLYVINYLBUTYRAL AND ITS APPLICATION |
| US4652604A (en) * | 1985-08-02 | 1987-03-24 | American Hoechst Corporation | Radiation-polymerizable composition and element containing a photopolymer composition |
| US4670507A (en) * | 1985-08-02 | 1987-06-02 | American Hoechst Corporation | Resin |
| US4707437A (en) * | 1985-08-02 | 1987-11-17 | Hoechst Celanese Corporation | Radiation-polymerizable composition and element containing a photopolymer composition |
| US4780392A (en) * | 1985-08-02 | 1988-10-25 | Hoechst Celanese Corporation | Radiation-polymerizable composition and element containing a photopolymerizable acrylic monomer |
| US4822720A (en) * | 1985-08-02 | 1989-04-18 | Hoechst Celanese Corporation | Water developable screen printing composition |
| US4895788A (en) * | 1985-08-02 | 1990-01-23 | Hoechst Celanese Corporation | Water developable lithographic composition |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2140921A (en) | Manufacture of solutions of a polymerized vinyl compound | |
| US2470324A (en) | Glycidyl ester copolymers | |
| GB466173A (en) | Manufacture of polymerisation products | |
| GB621784A (en) | Manufacture of polyvinyl acetal resins | |
| US2341553A (en) | Polyvinyl cyanoethyl ether | |
| GB743165A (en) | Water-soluble synthetic fibre and method for its manufacture | |
| GB396186A (en) | Manufacture of mixed polymerisation products | |
| US2668809A (en) | Preparation of high viscosity polyvinyl alcohol | |
| GB568914A (en) | Manufacture of polyvinyl acetal resins | |
| US3262905A (en) | Heat stabilization of polyvinyl alcohol with alkali metal phosphates | |
| GB1133126A (en) | Process for the manufacture of stable aqueous dispersions of vinyl esters of organicacids and ethylene | |
| GB497146A (en) | Polyvinyl acetal resins | |
| GB767757A (en) | Process for polymerizing chlorotrifluoroethylene | |
| US3100199A (en) | Preparation of polyacetals from halogenated unsaturated carboxylic acid esters | |
| GB711355A (en) | Improvements in or relating to the polymerisation of vinyl and vinylidene chlorides | |
| GB662793A (en) | Production and use of polymeric acetals | |
| US2582055A (en) | Improved method for polymerizing vinyl acetate in tertiary butyl alcohol | |
| US2527495A (en) | Polyvinyl acetal resin | |
| GB580020A (en) | Improvements in or relating to the polymerisation of vinyl acetate | |
| GB733093A (en) | Polymerisation process | |
| GB1074327A (en) | Process for the preparation of stable cation-active polymer dispersions and substances suitable for use in the process | |
| GB501810A (en) | Improvements in or relating to the production of flexible films or coatings of polymerised organic liquids | |
| DE1260791B (en) | Process for the preparation of aqueous vinyl ester homo- or copolymer dispersions | |
| US2561458A (en) | Method for preparing polyvinyl acetals | |
| US2468923A (en) | Vinyl acetate polymerization process |