Patent US4297477A successfully refreshed from Google Patents.
US4297477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide having --NH--(CH2)4 --CH(NRR')--CO--units
Assignee: Toray Industries Inc
•
Filing: 1979-12-31
•
Granted: 1981-10-27
•
Expires: 1999-12-31
Abstract
Abstract Provided are polyamides having properties which make them useful as adhesives, sizing agents, paper strength enhancers and as resins. These polyamides are prepared by heating an alpha-(N,N-disubstituted amino)-E-caprolactam, alone or in combination with one or more comonomers, in the presence of an anionic polymerization catalyst, and are characterized by a repeating unit reprsented by the formula ##STR1## wherein R and R' are each a lower alkyl group or a cyclic amine residue, and also having a relative viscosity of at leasrt 1.5.
Inventors
- 👤 Minoru Nakata
- 👤 Haruyo Sato
- 👤 Shinzo Imamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:35
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
A basic polyamide having a repeating unit represented by the formula: ##STR9## wherein R and R' each is a lower alkyl group having 1 to 4 carbon atoms, and having a relative viscosity of at least 1.5 measured at 25° C. in a solution of said basic polyamide at a concentration of 1 gr/100 ml. in a 98% sulfuric acid solvent.
Claim 2
Dependent Claim
61 words
A basic polyamide having a repeating unit represented by the formula: ##STR9## wherein R and R' each is a lower alkyl group having 1 to 4 carbon atoms, and having a relative viscosity of at least 1.5 measured at 25° C. in a solution of said basic polyamide at a concentration of 1 gr/100 ml. in a 98% sulfuric acid solvent.
Claim 3
Dependent Claim
16 words
The basic polyamide as defined in claim 1, in which both R and R' are methyl.
Claim 4
Dependent Claim
80 words
A basic polyamide having a repeating unit represented by the formula: ##STR10## wherein R and R' each is a lower alkyl group having 1 to 4 carbon atoms, and a repeating unit represented by the formula --NH--(CH.sub.2).sub.n --CO-- wherein n is an integer of 3 to 11, and having a relative viscosity of at least 1.5 measured at 25° C. in a solution of said basic polyamide at a concentration of 1 gr/100 ml. in a 98% sulfuric acid solvent.
Claim 5
Dependent Claim
80 words
A basic polyamide having a repeating unit represented by the formula: ##STR10## wherein R and R' each is a lower alkyl group having 1 to 4 carbon atoms, and a repeating unit represented by the formula --NH--(CH.sub.2).sub.n --CO-- wherein n is an integer of 3 to 11, and having a relative viscosity of at least 1.5 measured at 25° C. in a solution of said basic polyamide at a concentration of 1 gr/100 ml. in a 98% sulfuric acid solvent.
Claim 6
Dependent Claim
29 words
A basic polyamide as defined in claim 3, in which at least 10 mol% of the main polymer chain consists of the repeating unit represented by the formula ##STR11##
Claim 7
Dependent Claim
16 words
The basic polyamide as defined in claim 3, in which both R and R' are methyl.
Claim 8
Dependent Claim
20 words
The basic polyamide as defined in claim 3, in which both R and R' are methyl and n is 5.
Claim 9
Dependent Claim
20 words
The basic polyamide as defined in claim 3, in which both R and R' are methyl and n is 11.
References Cited (Backward Citations)
US3907755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |