GB746374A - Improved process and apparatus for the synthesis of polyamides - Google Patents
Improved process and apparatus for the synthesis of polyamidesInfo
- Publication number
- GB746374A GB746374A GB7074/53A GB707453A GB746374A GB 746374 A GB746374 A GB 746374A GB 7074/53 A GB7074/53 A GB 7074/53A GB 707453 A GB707453 A GB 707453A GB 746374 A GB746374 A GB 746374A
- Authority
- GB
- United Kingdom
- Prior art keywords
- water
- lactam
- vessel
- product
- hour
- 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
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
- C08G69/14—Lactams
- C08G69/16—Preparatory processes
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyamides (AREA)
Abstract
Lactams are polymerized by heating a mixture of lactam and water at atmospheric pressure and a temperature of 130-200 DEG C. for at least an hour to obtain a product melting above 100 DEG C. and then heating this product without the addition of a catalyst and with or without the addition of monomer lactam at 210-270 DEG C., while allowing water to escape, to form a high polymer. The molten polymer may be aged by standing for half an hour or more in an inert atmosphere. Apparatus is described for carrying out the process continuously or with an intermediate solidification of the initial product, with circulation of the water in the first stage (see Group III). The polymerization of caprolactam using up to 5 per cent water in the first stage is described.ALSO:Lactams are polymerized by feeding a mixture of lactam and water from a mixing <PICT:0746374/III/1> <PICT:0746374/III/2> vessel 1 to a vessel 11 where it is heated at atmospheric pressure for at least one hour at 130-200 DEG C., steam being partly vented at 6 and partly condensed at 15 and returned to the vessel 13. The resulting intermediate product, which preferably has a melting point of above 100 DEG C. is then fed to a polymerization tube 17 where it is maintained at 210-270 DEG C. for 8-20 hours to form a high polymer. The molten polymer is finally aged in a vessel 20 out of contact with oxygen for half an hour or more. The apparatus may be operated continuously. In a second apparatus, (Fig. 2, not shown), part only of the lactam is heated with water, the product being mixed with the remainder of the lactam and passed to the polymerisation tube. In a third apparatus, Fig. 3, molten lactam and water are fed by screw conveyer 32 and pipe 28 respectively to the heating vessel 25 the intermediate product being discharged through a perforated plate 48 into a vessel 29 where it solidifies. The intermediate product is later taken in a molten or broken-up state to the polymerization tube 30.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT746374X | 1952-03-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB746374A true GB746374A (en) | 1956-03-14 |
Family
ID=11315529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7074/53A Expired GB746374A (en) | 1952-03-31 | 1953-03-13 | Improved process and apparatus for the synthesis of polyamides |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE518697A (en) |
| DE (1) | DE1031963B (en) |
| FR (1) | FR1073143A (en) |
| GB (1) | GB746374A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4926078B1 (en) * | 1970-02-18 | 1974-07-05 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1067587B (en) * | 1957-07-20 | 1959-10-22 | Basf Ag | Process for the one-step production of molded polyamide bodies |
| US3236817A (en) * | 1961-10-17 | 1966-02-22 | Du Pont | Anionic process for preparing high molecular weight polyamides from lactams |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL52931C (en) * | 1938-06-10 | |||
| US2241322A (en) * | 1938-09-30 | 1941-05-06 | Du Pont | Process for preparing polyamides from cyclic amides |
| DE748023C (en) * | 1939-03-17 | 1944-10-25 | Process for the production of high polymer polyamides or mixed polyamides (super polyamides) |
-
0
- BE BE518697D patent/BE518697A/xx unknown
-
1953
- 1953-03-13 GB GB7074/53A patent/GB746374A/en not_active Expired
- 1953-03-20 FR FR1073143D patent/FR1073143A/en not_active Expired
- 1953-03-30 DE DEP9486A patent/DE1031963B/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4926078B1 (en) * | 1970-02-18 | 1974-07-05 |
Also Published As
| Publication number | Publication date |
|---|---|
| BE518697A (en) | |
| DE1031963B (en) | 1958-06-12 |
| FR1073143A (en) | 1954-09-20 |
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