US3923749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of caprolactam
Assignee: Rohm and Haas Co
•
Filing: 1972-08-10
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Granted: 1975-12-02
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Expires: 1992-08-10
Abstract
Abstract Melt polymerization of caprolactam with a dilithium salt of unsubstituted 3,5-disulfobenzoic acid moiety in a reactor.
Inventors
- 👤 Thomas J Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:10
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
38 words
THE METHOD OF PRODUCING A FIBER-FORMING POLYMER WHICH COMPRISES MELT POLYMERIZING CAPROLACTAM WITH A DILITHIUM SALT OF UNSUBSTITUTED 3,5-DISULFOBENZOIC ACID MOIETY IN A REACTOR IN THE RATIO OF 20 TO 45 MILLIMOLES OF SALT PER KILOGRAM OF CAPROLACTAM.
Claim 2
Independent Claim
38 words
THE METHOD OF PRODUCING A FIBER-FORMING POLYMER WHICH COMPRISES MELT POLYMERIZING CAPROLACTAM WITH A DILITHIUM SALT OF UNSUBSTITUTED 3,5-DISULFOBENZOIC ACID MOIETY IN A REACTOR IN THE RATIO OF 20 TO 45 MILLIMOLES OF SALT PER KILOGRAM OF CAPROLACTAM.
Claim 3
Dependent Claim
25 words
The method of claim 1, wherein said dilithium salt of unsubstituted 3,5-disulfobenzoic acid moiety is added to said reactor in a molten solution of caprolactam.
Claim 4
Dependent Claim
17 words
The method of claim 2, wherein said molten solution of caprolactam is added to a continuous reactor.
Claim 5
Dependent Claim
9 words
The product prepared by the process of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |