Patent US4699812A successfully refreshed from Google Patents.
US4699812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imparting stain resistance to certain fibers
Assignee: Honeywell International Inc
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Filing: 1986-11-28
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Granted: 1987-10-13
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Expires: 2006-11-28
Abstract
Abstract Fibers containing free amino groups, and especially polyamide fibers, can be made resistant to certain stains, especially those resulting from food grade dyes, by contacting the fiber with a solution of an aliphatic sulfonic acid containing 8 to 24 carbon atoms. Branched chain aliphatic sulfonic acids are more effective than the linear aliphatic sulfonic acids, and branching at the carbon bearing the sulfonic acid group is more effective than branching at any other carbon. Contacting the fiber with the solution of the aliphatic sulfonic acid needs to be done under acidic conditions, most preferably at a pH between 0.5 to 5.0.
Inventors
- 👤 Stephen A. Munk
- 👤 Thomas P. Malloy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:30
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/244; D06M13/248; D06M13/256; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23986
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
A process for imparting stain resistance to fibers selected from the group consisting of polyamide, wool and silk fibers containing free amino groups in an article manufactured from such fibers comprising contacting the fibers with a solution of an aliphatic sulfonic acid containing from about 8 to about 24 carbon atoms in an amount sufficient to impart stain resistance to the fibers at a pH between about 0.5 and about 5.0 and a temperature from about 15 to about 100° C., and thereafter drying the fibers.
Claim 2
Dependent Claim
86 words
A process for imparting stain resistance to fibers selected from the group consisting of polyamide, wool and silk fibers containing free amino groups in an article manufactured from such fibers comprising contacting the fibers with a solution of an aliphatic sulfonic acid containing from about 8 to about 24 carbon atoms in an amount sufficient to impart stain resistance to the fibers at a pH between about 0.5 and about 5.0 and a temperature from about 15 to about 100° C., and thereafter drying the fibers.
Claim 3
Dependent Claim
11 words
The process of claim 1 where the fiber is a polyamide.
Claim 4
Dependent Claim
16 words
The process of claim 1 where the sulfonic acid is an alkyl or alkenyl sulfonic acid.
Claim 5
Dependent Claim
17 words
The process of claim 3 where the sulfonic acid contains from 8 to about 20 carbon atoms.
Claim 6
Dependent Claim
15 words
The process of claim 3 where the alkyl or alkenyl is a branched chain moiety.
Claim 7
Dependent Claim
16 words
The process of claim 5 where branching is at the carbon bearing the sulfonic acid moiety.
Claim 8
Dependent Claim
14 words
The process of claim 1 where the sulfonic acid is a cycloaliphatic sulfonic acid.
Claim 9
Dependent Claim
15 words
The process of claim 1 where the cyclic portion is a cyclopentane or cyclohexane ring.
Claim 10
Dependent Claim
15 words
The process of claim 1 where the pH is between about 1.5 and about 3.0.
Claim 11
Dependent Claim
16 words
The process of claim 1 where the temperature is between about 35° and about 65° C.
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) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |