US5164261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyed antistain nylon with cationic dye modifier
Assignee: Invista North America LLC
•
Filing: 1990-08-08
•
Granted: 1992-11-17
•
Expires: 2010-08-08
Abstract
Abstract Shaped articles, such as fibers, formed of a polyamide formed by salt-blending the polyamide precursor salt with a cationic dye modifier, such as the dimethyl ester of 5-sulfoisophthalic acid, followed by polymerization, are rendered resistant to staining by acid dyes at ambient conditions either by adding an acid dye to the polymer melt or by dyeing with an acid dye from an acid dyebath at pH 2 to 7 and 60° to 100° C. so that the shaped article contains from at least 0.0048 and preferably at least 0.0096 wt % of an acid dyestuff. In a preferred aspect of the invention, the shaped articles are oriented, crimped, heat-set fibers for use as the facing in carpets.
Inventors
- 👤 William T. Windley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:33
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/48; D; D01; D01F; D01F1/00; D01F1/02; D01F1/06; D01F6/00; D01F6/78; D01F6/80; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/24; D06P3/241; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2839; Y10T428/29; Y10T428/2913; Y10T428/2922
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
75 words
A shaped article exhibiting stain-resistance with respect to acid dyes formed of a polyamide which is polyhexamethylene adipamide, poly-ε-caprolactam, or a copolymer of hexamethylene diamine adipic acid and ε-caprolactam which contains from 1 to 4 weight percent based on final polymer weight of a cationic dye modifier of the formula ##STR3## where Y is H, Li, Na, K or Cs, and which contains at least 0.0048 weight percent of an acid dyestuff based on polymer.
Claim 2
Dependent Claim
75 words
A shaped article exhibiting stain-resistance with respect to acid dyes formed of a polyamide which is polyhexamethylene adipamide, poly-ε-caprolactam, or a copolymer of hexamethylene diamine adipic acid and ε-caprolactam which contains from 1 to 4 weight percent based on final polymer weight of a cationic dye modifier of the formula ##STR3## where Y is H, Li, Na, K or Cs, and which contains at least 0.0048 weight percent of an acid dyestuff based on polymer.
Claim 3
Dependent Claim
24 words
The shaped article of claim 1 wherein from 1 to 4 weight percent of units of the formula ##STR4## are present in the polyamide.
Claim 4
Dependent Claim
14 words
The shaped article of claim 2 which is in the form of a fiber.
Claim 5
Dependent Claim
19 words
The fiber of claim 3 which contains at least 0.0096 weight percent of an acid dyestuff based on polymer.
Claim 6
Dependent Claim
19 words
The fiber of claim 4 wherein the fiber is oriented by stretching from 2.5 to 6× its original length.
Claim 7
Dependent Claim
10 words
The fiber of claim 5 wherein the fiber is crimped.
Claim 8
Dependent Claim
20 words
The fiber of claim 5 wherein the fiber has been heat set in air at from 185° to 215° C.
Claim 9
Dependent Claim
20 words
The fiber of claim 6 wherein the fiber has been heat set in air at from 185° to 215° C.
Claim 10
Dependent Claim
19 words
The fiber of claim 7 wherein from 1 to 2 weight percent of the cationic dye modifier is present.
Claim 11
Dependent Claim
19 words
The fiber of claim 8 wherein from 1 to 2 weight percent of the cationic dye modifier is present.
Claim 12
Dependent Claim
29 words
The fiber of claim 9 wherein the acid dyestuff has been applied from an aqueous dyebath at from 60° to 100° C. and a pH of 2 to 7.
Claim 13
Dependent Claim
29 words
The fiber of claim 10 wherein the acid dyestuff has been applied from an aqueous dyebath at from 60° to 100° C. and a pH of 2 to 7.
Claim 14
Dependent Claim
22 words
The fiber of claim 9 wherein the acid dyestuff has been added to the polymer composition from which the fiber is formed.
Claim 15
Dependent Claim
22 words
The fiber of claim 10 wherein the acid dyestuff has been added to the polymer composition from which the fiber is formed.
Claim 16
Dependent Claim
11 words
The fiber of claim 11 wherein the polyamide is polyhexamethylene adipamide.
Claim 17
Dependent Claim
11 words
The fiber of claim 12 wherein the polyamide is polyhexamethylene adipamide.
Claim 18
Dependent Claim
9 words
The fiber of claim 15 wherein Y is Na.
Claim 19
Dependent Claim
9 words
The fiber of claim 16 wherein Y is Na.
Claim 20
Dependent Claim
17 words
The fiber of claim 17 wherein the polyamide has a relative viscosity of from 35 to 100.
Claim 21
Dependent Claim
17 words
The fiber of claim 18 wherein the polyamide has a relative viscosity of from 35 to 100.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |