US5074883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for providing polyamide materials with stain resistance
Assignee: 3M Co
•
Filing: 1989-12-11
•
Granted: 1991-12-24
•
Expires: 2009-12-11
Abstract
Abstract A method for imparting to fibrous polyamide materials stain resistance to acid colorants is provided. The method comprises (a) applying by immersion or padding of said material or applying to the fiber during spinning thereof 0.01 to 0.3 weight percent based on the weight of said polyamide material of a stain resist agent and (b) applying sufficient stain resist agent by foam application to provide a stain resistance rating of at least about 5.
Inventors
- 👤 Shou-Lu G. Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:32
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/263; D06M15/37; D06M15/39; D06M15/41; D06M23/00; D06M23/04; D06M2101/00; D06M2101/16; D06M2101/30; D06M2101/34; Y; Y10; Y10S; Y10S8/00; Y10S8/21
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
112 words
A method for imparting to fibrous polyamide materials stain resistance to acid colorants comprising (a) applying by immersion or padding of said material or applying to the fiber during spinning thereof 0.01 to 0.3 weight percent based on the weight of said polyamide material of a stain resist agent selected from the group consisting of (i) a partially sulfonated novolak resin, (ii) polymethacrylic acid, copolymers of methacrylic copolymers of methacrylic acid, or combinations of said polymethacrylic acid and said copolymers of methacrylic acid, and (iii) combinations of (i) and (ii) and then (b) applying sufficient stain resist agent by foam application to provide a stain resistance rating of at least about 5.
Claim 2
Independent Claim
112 words
A method for imparting to fibrous polyamide materials stain resistance to acid colorants comprising (a) applying by immersion or padding of said material or applying to the fiber during spinning thereof 0.01 to 0.3 weight percent based on the weight of said polyamide material of a stain resist agent selected from the group consisting of (i) a partially sulfonated novolak resin, (ii) polymethacrylic acid, copolymers of methacrylic copolymers of methacrylic acid, or combinations of said polymethacrylic acid and said copolymers of methacrylic acid, and (iii) combinations of (i) and (ii) and then (b) applying sufficient stain resist agent by foam application to provide a stain resistance rating of at least about 5.
Claim 3
Dependent Claim
36 words
The method of claim 1 wherein said stain resist agent is applied in step (a) by immersion in a bath at a temperature of 60° to 90° C. and a pH of less than about 7.
Claim 4
Dependent Claim
31 words
The method of claim 1 wherein said stain resist agent is applied in step (a) by padding a solution of stain resist agent at ambient temperature onto said fibrous polyamide material.
Claim 5
Dependent Claim
10 words
The method of claim 1 further comprising drying said material.
Claim 6
Dependent Claim
13 words
The method of claim 2 wherein said pH is less than about 5.
Claim 7
Dependent Claim
28 words
The method of claim 1 wherein about 0.05 to 0.15 weight percent stain resist agent based on the weight of said polyamide material is applied in step (a).
Claim 8
Dependent Claim
28 words
The method of claim 1 wherein about 0.07 to 0.66 weight percent stain resist agent based on the weight of said polyamide material is applied in step (b).
Claim 9
Dependent Claim
28 words
The method of claim 1 wherein about 0.33 to 0.66 weight percent stain resist agent based on the weight of said polyamide material is applied in step (b).
Claim 10
Dependent Claim
15 words
The method of claim 1 wherein said stain resistance rating is at least about 7.
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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) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |