GB690936A - Improvements in or relating to the dissolving of synthetic linear polyamides and recovering them from solution - Google Patents
Improvements in or relating to the dissolving of synthetic linear polyamides and recovering them from solutionInfo
- Publication number
- GB690936A GB690936A GB1102450A GB1102450A GB690936A GB 690936 A GB690936 A GB 690936A GB 1102450 A GB1102450 A GB 1102450A GB 1102450 A GB1102450 A GB 1102450A GB 690936 A GB690936 A GB 690936A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- water
- alcohol
- ethanol
- polyamides
- 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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
- C08J11/08—Recovery or working-up of waste materials of polymers without chemical reactions using selective solvents for polymer components
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
- C08J3/14—Powdering or granulating by precipitation from solutions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Dispersion Chemistry (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
Linear unsubstituted polyamides or polyesteramides yielding on acid hydrolysis (a) an aminoacid hydrochloride, (b) a diamine hydrochloride and a dibasic acid, or (c) an amino-alcohol hydrochloride and a dibasic acid, and insoluble in monohydric aliphatic saturated alcohols having one to five carbon atoms or their aqueous mixtures, at temperatures up to the normal boiling-points thereof, are dissolved in aqueous mixtures of such alcohols containing from 75 to 5 per cent by volume water and 25 to 95 per cent by volume alcohol(s) by heating the polyamides therewith under pressure to temperatures substantially above the normal boiling-points of the mixtures. On cooling, the polyamides separate in a finely-divided state. The hot solutions may be filtered or centrifuged to remove insoluble impurities before cooling. The treatment is stated to have no degrading effect on the polymer, and to be useful for recovering nylon from contaminated scrap. The temperature for solution and the proportions of water and alcohol vary with the particular polyamide and alcohol employed. In examples polyhexamethylene adipamide was dissolved in (1) 50 per cent water-50 per cent methanol, at 160 DEG C.; (2) 5 per cent water-95 per cent ethanol, at 180 DEG C.; (3) 20 per cent water-80 per cent ethanol at 168 DEG C.; (4) 50 per cent water-50 per cent ethanol, at 162 DEG C.; (5) 65 per cent water-35 per cent ethanol, at 181 DEG C.; (6) 50 per cent water-50 per cent n-propanol, at 165 DEG C.; (7) 50 per cent water-50 per cent isopropanol at 170 DEG C.; (8) 10 per cent water-90 per cent n-butanol at 180 DEG C.; (9) 50 per cent water-50 per cent tert.-butanol, at 172 DEG C.; (10) 10 per cent water-90 per cent n-amyl alcohol at 188 DEG C. In examples: (11) to (13) polyhexamethylene sebacamide was dissolved in (11) 10 per cent water-90 per cent n-amyl alcohol at 190 DEG C.; (12) 25 per cent water-75 per cent methanol at 203 DEG C.; (13) 50 per cent water-50 per cent n-propyl alcohol at 212 DEG C. All solutions precipitated finely-divided polyamide on cooling. Specification 576,363 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US690936XA | 1949-05-05 | 1949-05-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB690936A true GB690936A (en) | 1953-04-29 |
Family
ID=22086713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1102450A Expired GB690936A (en) | 1949-05-05 | 1950-05-04 | Improvements in or relating to the dissolving of synthetic linear polyamides and recovering them from solution |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR1022855A (en) |
| GB (1) | GB690936A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1096034B (en) * | 1955-11-16 | 1960-12-29 | Gen Dispersions Inc | Process for the continuous production of aqueous dispersions of polyamides soluble in alcohol or in mixtures of alcohol and water |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2906647C2 (en) * | 1979-02-21 | 1980-12-11 | Chemische Werke Huels Ag, 4370 Marl | Process for the production of powdery coating agents !! based on polyamides with at least 10 aliphatically bonded carbon atoms per carbonamide group |
-
1950
- 1950-05-04 GB GB1102450A patent/GB690936A/en not_active Expired
- 1950-05-05 FR FR1022855D patent/FR1022855A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1096034B (en) * | 1955-11-16 | 1960-12-29 | Gen Dispersions Inc | Process for the continuous production of aqueous dispersions of polyamides soluble in alcohol or in mixtures of alcohol and water |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1022855A (en) | 1953-03-11 |
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