US3674751A
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Method of manufacturing polyamides by alkaline polymerization of cyclic lactams
Assignee: Z ANTONIZA ZAPOTOCKEHO NARODNI
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Filing: 1969-12-22
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Granted: 1972-07-04
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Expires: 1989-12-22
Abstract
Abstract An improved process for manufacturing polyamides by alkaline polymerization of cyclic lactams which consists of reacting alkali metal hydroxides or alcoholates with the lactams, with water or the corresponding alcohol being removed and putting the reaction mixture into contact with molecular sieves.
Inventors
- 👤 Jaroslav Kralicek
- 👤 Vladimir Kubanek
- 👤 Jitka Solcova
- 👤 Jaroslava Kondelikova
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 01:09
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
A method for preparing polymerizable mixtures for anIonic polymerization of lactams according to claim 1, in which the reaction mixture is contacted with a molecular sieve of synthetic zeolite type having an effective pore diameter from 3 to 6A., and separating the resulting lactam alkali metal salt solution in lactam from the molecular sieve.
Claim 2
Dependent Claim
25 words
A method for preparing polymerizable mixtures for anionic polymerization of lactams according to claim 1 in which the lactam is reacted in the molten state.
Claim 3
Dependent Claim
24 words
A method for preparing polymerizable mixtures for anionic polymerization of lactams according to claim 1 in which the lactam is reacted in a solution.
Claim 4
Dependent Claim
26 words
A method for preparing polymerizable mixtures for anionic polymerization of lactams according to claim 1 in which the lactam is reacted with an alkali metal hydroxide.
Claim 5
Dependent Claim
26 words
A method for preparing polymerizable mixtures for anionic polymerization of lactams according to claim 1 in which the lactam is reacted with an alkali metal alcoholate.
Claim 6
Dependent Claim
30 words
A method for preparing polymerizable mixtures for anionic polymerization of lactams according to claim 1 in which the molecular sieve has an effective pore diameter from 3 to 6 A.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |