US4303778A
Expired / Lapsed
US
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Method of anionic polymerization of ω-aminoacid lactams with alkali metal-Al,B-alkoxy lactamate initiator
Assignee: University of Chemistry and Technology
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Filing: 1978-01-17
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Granted: 1981-12-01
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Expires: 1998-01-17
Abstract
Abstract A method is described for the anionic polymerization and copolymerization of ω-aminoacid lactams. This end is attained at elevated temperatures in the presence of a polymerization initiator of the formula MeZX.sub.m L.sub.n wherein Me is an alkali metal, Z is boron or aluminum, X is an alkoxy group and L is an organic residue derived from a lactam and being of the formula ##STR1## wherein a is an integer in the range 3-11, m is an integer in the range of 0-3, (m+n) is 4 and n is (4-m).
Inventors
- 👤 Jaroslav Kralicek
- 👤 Vladimir Kubanek
- 👤 Jiri Marik
- 👤 Jaroslava Kondelikova
- 👤 Jiri Machacek
- 👤 Bohuslav Casensky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:12
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
149 words
A method for the anionic polymerization of at least one ω-aminoacid lactam of the formula ##STR13## wherein a is an integer ranging from 3 to 11 which comprises effecting polymerization at elevated temperatures in the presence of an initiator for the anionic polymerization of lactams, said initiator having the formula MeZX.sub.m L.sub.n wherein Me is an alkali metal selected from the group consisting of lithium, sodium and potassium, Z is selected from the group consisting of aluminum and boron, X is an alkoxy group of 3 to 6 carbon atoms and L is an organic residue derived from lactam of the formula ##STR14## wherein a is an integer from 3 to 11, m is an integer selected from 0, 1 and 3, the sum of m+n is 4, or n is (4-m) and an activator for the anionic polymerization of lactam, so resulting in a solid crystalline lactam polymer.
Claim 2
Independent Claim
149 words
A method for the anionic polymerization of at least one ω-aminoacid lactam of the formula ##STR13## wherein a is an integer ranging from 3 to 11 which comprises effecting polymerization at elevated temperatures in the presence of an initiator for the anionic polymerization of lactams, said initiator having the formula MeZX.sub.m L.sub.n wherein Me is an alkali metal selected from the group consisting of lithium, sodium and potassium, Z is selected from the group consisting of aluminum and boron, X is an alkoxy group of 3 to 6 carbon atoms and L is an organic residue derived from lactam of the formula ##STR14## wherein a is an integer from 3 to 11, m is an integer selected from 0, 1 and 3, the sum of m+n is 4, or n is (4-m) and an activator for the anionic polymerization of lactam, so resulting in a solid crystalline lactam polymer.
Claim 3
Dependent Claim
12 words
Method in accordance with claim 1, wherein said activator is an isocyanate.
References Cited (Backward Citations)
US3919175A
Cited
US4124584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |