US3901853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid-dyeable fibers of polyester modified with a tetramethylpiperidine compound having two ester-forming groups
Assignee: EIDP Inc
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Filing: 1974-09-13
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Granted: 1975-08-26
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Expires: 1994-09-13
Abstract
Abstract Textile fibers or filaments prepared from polyesters modified with a minor proportion of a 2,2,6,6-tetramethylpiperidine compound to provide dyeability with acid dyes. The tetramethylpiperidine compounds used to modify the polyester have two ester-forming groups and can be mixed wtih polyesters, or polyester-forming compositions, at elevated temperatures to react and copolymerize into polyester molecules without limiting molecular weight as in the case of monofunctional modifiers. Polyesters modified with a variety of difunctional tetramethylpiperidine compounds are illustrated.
Inventors
- 👤 Murty S Tanikella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:11
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/685
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
61 words
ACID-DYEABLE TEXTILE FIBERS OR FILAMENTS OF ALINEAR GLYCOLTEREPHTHALATE COPOLYESTER WITH A MINOR PROPORTION, SUFFICIENT TO PROVIDE AT LEAST 0.02 WEIGHT PERCENT NITROGEN, OF 2,2,6,6TETRAMETHYLPIPERIDINE COMPOUND HAVING SUBSTITUENTS AT THE 1 AND/OR 4 POSITIONS ON THE TETRAMETHYLPIPERIDINE RING WHICH COMPRISES A TOTAL OF TWO ESTER-FORMING GROUPS, EACH GROUP BEING ATTACHED DIRECTLY TO THE TETRAMETHYLPIPERIDINE RING OR ATTACHED TO A TETRAMETHYLPIPERIDINE RING SUBSTITUENT.
Claim 2
Dependent Claim
61 words
ACID-DYEABLE TEXTILE FIBERS OR FILAMENTS OF ALINEAR GLYCOLTEREPHTHALATE COPOLYESTER WITH A MINOR PROPORTION, SUFFICIENT TO PROVIDE AT LEAST 0.02 WEIGHT PERCENT NITROGEN, OF 2,2,6,6TETRAMETHYLPIPERIDINE COMPOUND HAVING SUBSTITUENTS AT THE 1 AND/OR 4 POSITIONS ON THE TETRAMETHYLPIPERIDINE RING WHICH COMPRISES A TOTAL OF TWO ESTER-FORMING GROUPS, EACH GROUP BEING ATTACHED DIRECTLY TO THE TETRAMETHYLPIPERIDINE RING OR ATTACHED TO A TETRAMETHYLPIPERIDINE RING SUBSTITUENT.
Claim 3
Dependent Claim
20 words
Fibers or filaments as defined in claim 1 wherein the copolyester 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 copolyester comprises 2 to 10 weight percent ethylene adipate units.
Claim 5
Dependent Claim
31 words
Fibers or filaments as defined in claim 1 wherein the copolyester comprises an amount of tetramethylpiperidine compound which provides 0.02 to 0.25 weight percent nitrogen, based on the weight of copolyester.
Claim 6
Dependent Claim
31 words
Fibers or filaments as defined in claim 1 wherein the tetramethylpiperidine compound has substituents at the 1 and 4 positions of the tetramethylpiperidine ring and each substituent comprises an ester-forming group.
Claim 7
Dependent Claim
15 words
Fibers or filaments as defined in claim 1 wherein the tetramethylpiperidine compound is a glycol.
Claim 8
Dependent Claim
16 words
Fibers or filaments as defined in claim 1 wherein the tetramethylpiperidine compound is a dicarboxylic acid.
Claim 9
Dependent Claim
16 words
Fibers or filaments as defined in claim 1 wherein the tetramethylpiperidine compound is a hydroxy acid.
Claim 10
Dependent Claim
20 words
Fibers or filaments as defined in claim 1 wherein the tetramethylpiperidine compound is an s-triazine derivative containing two ester-forming groups.
Claim 11
Dependent Claim
14 words
Fibers or filaments as defined in claim 1 wherein the tetramethylpiperidine compound is 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine.
Claim 12
Dependent Claim
15 words
Fibers or filaments as defined in claim 1 wherein the tetramethylpiperidine compound is 1-(2-hydroxy-2-methylethyl)-2, 2,6,6-tetramethyl-4-hydroxypiperidine.
Claim 13
Dependent Claim
14 words
Fibers or filaments as defined in claim 1 wherein the tetramethylpiperidine compound is 5-((2,2,6,6-tetramethyl-4-piperidinyl)sulfamoyl)isophthalate.
Claim 14
Dependent Claim
15 words
Fibers or filaments as defined in claim 1 wherein the tetramethylpiperidine compound is 5-((2,2,6,6-tetramethyl-4-piperidinyl)sulfamoyl)isophthalic acid.
Claim 15
Dependent Claim
14 words
Fibers or filaments as defined in claim 1 wherein the tetramethylpiperidine compound is 5-((1,2,2,6,6-pentamethyl-4-piperidinyl)sulfamoyl)isophthalate.
Claim 16
Dependent Claim
14 words
Fibers or filaments as defined in claim 1 wherein the tetramethylpiperidine compound is ((2,2,6,6-tetramethyl-4-piperidinyl)sulfamoyl)fluorene-9,9-dipropioniate.
Claim 17
Dependent Claim
15 words
Fibers or filaments as defined in claim 1 wherein the tetramethylpiperidine compound is 2,2''-(4,6-bis(2,2,6,6-tetramethyl-4-piperidyl)amino)-s-triazine-2-ylimino) -diethanol.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |