US3692745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for chemically modifying thread-forming polyesters
Assignee: Akzona Inc
•
Filing: 1971-01-19
•
Granted: 1972-09-19
•
Expires: 1991-01-19
Abstract
Abstract A method for the chemical modification of a thread-forming polymeric polyester containing carboxyl end groups, which comprises treating the molten polyester with an unsaturated organic compound capable of reacting with said carboxyl end groups, the compound having one or two STRUCTURAL UNITS WHICH REACT WITH CARBOXYL END GROUPS TO FORM IMIDE BONDS THEREIN.
Inventors
- 👤 Eenje Molenaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:22
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/91; C08G63/914; C08G63/916; D; D01; D01F; D01F6/00; D01F6/58; D01F6/62
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
10 words
Fibers and threads manufactured by the method of claim 1.
Claim 2
Independent Claim
137 words
A method for the chemical modification of a thread-forming polyester containing carboxyl end groups, which comprises treating the molten polyester with an unsaturated organic compound capable of reacting with said carboxyl end groups, said compound being a ketenimine of the formula: wherein R1 and R2 are the same or different organic radicals selected from the group consisting of alkyl radicals containing from one to 10 carbon atoms and aromatic hydrocarbon radicals containing from six to 12 carbon atoms, n is an integer from 1 to 2, and R'''' is an organic radical selected from the group consisting of said alkyl and aryl groups when n is 1, and selected from the group consisting of arylene groups containing from six to 12 carbon atoms and alkylene groups containing from one to 10 carbon atoms when n is 2.
Claim 3
Dependent Claim
18 words
The method of claim 3 in which n is 2 and R1 and R2 are both aromatic radicals.
Claim 4
Dependent Claim
13 words
The method of claim 4 in which R1 and R2 are phenyl groups.
Claim 5
Dependent Claim
35 words
The method of claim 4 in which approximately 0.4 to 3 equivalents of said structural units, are reacted with one equivalent of said carboxyl end groups at temperatures of from about 250* to 320* C.
References Cited (Backward Citations)
US3193522A
Cited
US3300447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |