US3943095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid dyeable yarn from polyamide having N,N'-di (3-aminopropyl)piperazine moiety units
Assignee: EIDP Inc
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Filing: 1974-09-26
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Granted: 1976-03-09
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Expires: 1994-09-26
Abstract
Abstract Yarns of good color characterized by a high capability of being deeply dyed with acid dyes are spun from copolyamides having a relative viscosity of 35-75, an amine end concentration of 35-80 gram equivalents per 10 6 grams of polymer and a defined content of units formed in part from N,N'-di(3-aminopropyl)piperazine and which have been produced with the introduction of a defined content of a specified organic phosphorous compound prior to extrusion of the polymer.
Inventors
- 👤 Richard Donnan Livingston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:48
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/78; D01F6/80; C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/265; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; D01F1/00; D01F1/02; D01F1/10; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/24; D06P3/241; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/924
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
140 words
A yarn with high capability of being deeply dyed with acid dyes, spun from composition consisting essentially of a copolyamide having a relative viscosity of from about 35-75 as determined using an 8.4 weight percent solution of the polyamide dissolved in a 90/10 weight by weight formic acid/water solution at 25°C., and a primary amine end concentration of from 35-80 gram equivalents per 10 6 grams of copolyamide, said copolyamide consisting essentially of the following repeating units: ##EQU2## the units containing the piperazine ring constituting from about 0.3 to 3.5% of the total number of repeating units, said copolyamide having been produced with the introduction of from about 0.05 to 0.5% by weight based on polymer weight, an organic phosphorous compound selected from the group consisting of phenylphosphinic acid, sodium-, potassium- or hexamethylenediammonium phenylphosphinate prior to extrusion of the polymer.
Claim 2
Dependent Claim
140 words
A yarn with high capability of being deeply dyed with acid dyes, spun from composition consisting essentially of a copolyamide having a relative viscosity of from about 35-75 as determined using an 8.4 weight percent solution of the polyamide dissolved in a 90/10 weight by weight formic acid/water solution at 25°C., and a primary amine end concentration of from 35-80 gram equivalents per 10 6 grams of copolyamide, said copolyamide consisting essentially of the following repeating units: ##EQU2## the units containing the piperazine ring constituting from about 0.3 to 3.5% of the total number of repeating units, said copolyamide having been produced with the introduction of from about 0.05 to 0.5% by weight based on polymer weight, an organic phosphorous compound selected from the group consisting of phenylphosphinic acid, sodium-, potassium- or hexamethylenediammonium phenylphosphinate prior to extrusion of the polymer.
Claim 3
Dependent Claim
14 words
The yarn of claim 1 wherein the organic phosphorous compound introduced is phenylphosphinic acid.
Claim 4
Dependent Claim
27 words
The yarn of claim 1 wherein the amount of the organic phosphorous compound introduced is from about 0.10 to about 0.35% by weight based on polymer weight.
Claim 5
Dependent Claim
26 words
The yarn of claim 1 wherein the units containing the piperazine ring constitute from about 1-2% of the total number of repeating units in the copolyamide.
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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |