Patent US3910860A successfully refreshed from Google Patents.
US3910860A
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Fibers of acid-dyeable polyester having terminal tetramethylpiperidine groups
Assignee: EIDP Inc
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Filing: 1974-09-16
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Granted: 1975-10-07
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Expires: 1994-09-16
Abstract
Abstract Acid-dyeable polyester fibers or filaments which are characterized by the presence of 2,2,6,6-tetramethylpiperidine terminal groups on some of the polyester molecules. The modified polyester may be formed by reacting a linear terephthalate polyester with a tetramethyl piperidine compound which has an ester-forming substituent attached at the 1 position or 4 position of the tetramethyl piperdine ring, e.g., 1-(2hydroxyethyl)-2,2,6,6-tetramethylpiperidine or 2,2,6,6tetramethyl-4-hydroxypiperidine.
Inventors
- 👤 Murty S Tanikella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:27
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/685; C08G63/6854; C08G63/6856; D; D06; D06P; D06P3/00; D06P3/34; D06P3/52; D06P3/521
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
51 words
ACID - DYEABLE TEXTILE FIBERS OR FILAMENTS OF A LINEAR TEREPTHALATE POLYESTER CHATACTERIZED BY THE PRESENCE, AS TERMINAL GROUPS ON POLYESTER MOLECULES, OF A 2,2,6,6-TETRAMETHYLPIPERIDINE COMPOUND ATTACHED BY A SINGLE ESTER-FORMING SUBSTITUENT AT THE POSITION OR 4 POSITION OF THE TETRAMETHYLPIPERIDINE RING SUFFICIENT TO PROVIDE AT LEAST 0.02 WEIGHT PERCENT NITROGEN.
Claim 2
Dependent Claim
51 words
ACID - DYEABLE TEXTILE FIBERS OR FILAMENTS OF A LINEAR TEREPTHALATE POLYESTER CHATACTERIZED BY THE PRESENCE, AS TERMINAL GROUPS ON POLYESTER MOLECULES, OF A 2,2,6,6-TETRAMETHYLPIPERIDINE COMPOUND ATTACHED BY A SINGLE ESTER-FORMING SUBSTITUENT AT THE POSITION OR 4 POSITION OF THE TETRAMETHYLPIPERIDINE RING SUFFICIENT TO PROVIDE AT LEAST 0.02 WEIGHT PERCENT NITROGEN.
Claim 3
Dependent Claim
20 words
Fibers or filaments as defined in claim 1 wherein the polyester comprises at least 85 mole percent ethylene terephthalate units.
Claim 4
Dependent Claim
20 words
Fibers or filaments as defined in claim 2 wherein the polyester is a terephthalate copolyester containing an aliphatic dicarboxylic constituent.
Claim 5
Dependent Claim
22 words
Fibers of filaments as defined in claim 3 wherein the copolyester contains up to 15 mole percent of ethylene adipate polymer units.
Claim 6
Dependent Claim
22 words
Fibers or filaments as defined in claim 3 wherein the copolyester contains up to 15 mole percent of ethylene dimerate polymer units.
Claim 7
Dependent Claim
20 words
Fibers or filaments as defined in claim 1 wherein 2,2,6,6-tetramethyl-4-hydroxypiperidine is attached to ends of polyester molecules by terephthalate linkages.
Claim 8
Dependent Claim
21 words
Fibers or filaments as defined in claim 1 wherein 1-alkyl-2, 2,6,6-tetramethyl-4-hydroxypiperidine is attached to ends of polyester molecules by terephthalate linkages.
Claim 9
Dependent Claim
20 words
Fibers of filaments as defined in claim 1 wherein 1-(2-hydroxyethyl)-2,2,6,6-tetramethylpiperidine is attached to ends of polyester molecules by terephthalate linkages.
Claim 10
Dependent Claim
21 words
Fibers or filaments as defined in claim 1 wherein (2,2,6,6-tetramethyl-4-piperidine) acetate is attached to ends of polyester molecules by ester linkages.
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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |