US4075378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide filaments with a basic-dyeable sheath and an acid-dyeable core and dyeing process therefor
Assignee: EIDP Inc
•
Filing: 1975-09-12
•
Granted: 1978-02-21
•
Expires: 1995-09-12
Abstract
Abstract A synthetic polyamide filament is composed of an acid-dyeable polyamide core surrounded by a basic-dyeable polyamide sheath containing aromatic sulfonate groups. At a normal dyeing pH of 4-7 the core accepts leveling acid dyes but not reserving acid or basic dyes. The sheath accepts leveling and nonleveling basic dyes. Versatility in cross-dye styling when such filaments are combined with acid-dyeable and basic-dyeable monocomponent filaments is demonstrated.
Inventors
- 👤 Anthony Anton
- 👤 Joseph Arthur Benoit Nolin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:04
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/12; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/924; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23993; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2929; Y10T428/2931; Y10T442/00; Y10T442/30; Y10T442/3146; Y10T442/3154; Y10T442/60; Y10T442/637; Y10T442/641
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
69 words
A synthetic polyamide filament composed of: an acid-dyeable fiber-forming polyamide core which constitutes at least about 40 volume percent of the filament and which contains from 40 to 100 equivalents of amine end-groups per 10 6 grams of the core polyamide; and, a substantially concentric, basic-dyeable, fiber-forming polyamide sheath which contains at least 50 equivalents of chemically attached aromatic sulfonate groups per 10 6 grams of the sheath polyamide.
Claim 2
Dependent Claim
69 words
A synthetic polyamide filament composed of: an acid-dyeable fiber-forming polyamide core which constitutes at least about 40 volume percent of the filament and which contains from 40 to 100 equivalents of amine end-groups per 10 6 grams of the core polyamide; and, a substantially concentric, basic-dyeable, fiber-forming polyamide sheath which contains at least 50 equivalents of chemically attached aromatic sulfonate groups per 10 6 grams of the sheath polyamide.
Claim 3
Dependent Claim
16 words
A filament of claim 1 having a sheath/core ratio by volume of from 60/40 to 40/60.
Claim 4
Dependent Claim
26 words
A filament of claim 1 wherein the core polymer contains from 60 to 90 equivalents of amine end groups per 10 6 grams of core polyamide.
Claim 5
Dependent Claim
29 words
A filament of claim 1 wherein the sheath comprises a copolyamide containing from 60 to 80 equivalents of copolymerized aromatic sulfonate groups per 10 6 grams of the copolyamide.
Claim 6
Dependent Claim
17 words
A filament of claim 1 having substantially equal amounts by volume of the core and sheath polyamide.
Claim 7
Dependent Claim
10 words
A textile article comprised of the filaments of claim 1.
Claim 8
Dependent Claim
23 words
A textile article of claim 6 further containing monocomponent filaments of a basic-dyeable polyamide in combination with monocomponent filaments of an acid-dyeable polyamide.
Claim 9
Dependent Claim
15 words
A textile article of claim 7 wherein the textile article is a continuous, multifilament yarn.
Claim 10
Dependent Claim
14 words
A textile article of claim 6 wherein the textile article is a tufted carpet.
Claim 11
Dependent Claim
31 words
A dyeing process comprising cross-dyeing filaments of claim 1 in an aqueous dye bath containing a basic dye and a leveling acid dye at a pH of from 4 to 7.
References Cited (Backward Citations)
US2989798A
Cited
US3843609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |