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US4770667A
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Use of substituted 2-(2'-hydroxyaryl)-2H-benzotriazolesulfonates as photostabilizing agents for natural and synthetic fibres
Assignee: The University of Texas System
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Filing: 1987-03-17
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Granted: 1988-09-13
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Expires: 2007-03-17
Abstract
Abstract A method for protecting synthetic and natural fibres against phototendering. The method comprises treating the fibres with a substituted benzotriazolesulfonate of the following formula: ##STR1## wherein (I) R 1 is hydrogen or halogen, R 2 is hydrogen or alkyl, R 3 is hydrogen or hydroxy, R 4 is --SO 3 X where X is hydrogen or an alkali metal, and R 5 is hydrogen, with the proviso that R 2 is not methyl when R 1 and R 3 are hydrogen; or (II) R 1 , R 3 and R 4 are hydrogen, R 2 is --SO 3 X where X is hydrogen or an alkali metal, and R 5 is --OR 6 where R 6 is hydrogen or alkyl; or (III) R 1 is hydrogen or halogen, R 2 is --SO 3 X where X is hydrogen or an alkali metal, R 3 and R 5 are hydrogen, and R 4 is hydrogen, alkyl or benzyl; or (IV) R 1 is --SO 3 X where X is hydrogen or an alkali metal, R 2 is alkyl, R 3 and R 5 are hydrogen, and R 4 is hydrogen or alkyl; under acidic conditions. The method is particularly suitable for treating wool, silk and nylon fibres, including blends thereof.
Inventors
- 👤 Neil A. Evans
- 👤 Ian H. Leaver
- 👤 Judi Rosevear
- 👤 Peter J. Waters
- 👤 John F. K. Wilshire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:19
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/64; D06P1/642; D06P1/6426; C; C07; C07D; C07D249/00; C07D249/16; C07D249/18; C07D249/20; D06M; D06M13/00; D06M13/322; D06M13/35; D06M13/352; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/917
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
59 words
A method for protecting fibres against phototendering which comprises treating the fibres under acidic conditions with a substituted benzotriazolesulfonate of the following formula: ##STR11## wherein R 1 is hydrogen or halogen, R 2 is --SO 3 X where X is hydrogen or an alkali metal, R 3 and R 5 are hydrogen, and R 4 is alkyl or benzyl.
Claim 2
Independent Claim
59 words
A method for protecting fibres against phototendering which comprises treating the fibres under acidic conditions with a substituted benzotriazolesulfonate of the following formula: ##STR11## wherein R 1 is hydrogen or halogen, R 2 is --SO 3 X where X is hydrogen or an alkali metal, R 3 and R 5 are hydrogen, and R 4 is alkyl or benzyl.
Claim 3
Dependent Claim
24 words
A method as defined in claim 1, wherein said acidic conditions involve adjustment to a pH within the range of 2.0-5.5 with sulphuric acid.
Claim 4
Dependent Claim
21 words
A method as defined in claim 1, in which the fibre is treated for about 90 minutes at about 80° C.
Claim 5
Dependent Claim
21 words
A method as defined in claim 2, in which the fibre is treated for about 90 minutes at about 80° C.
Claim 6
Independent Claim
32 words
A method as defined in any one of claims 1-4, in which the substituted benzotriazolenesulfonate is in an aqueous liquor and the liquor and fibre are in a ratio of about 60:1.
Claim 7
Independent Claim
24 words
A method as defined in any one of claims 1-4, in which the fibre is wool, including dyed wool, silk, nylon or blends thereof.
Claim 8
Independent Claim
44 words
A method as defined in any one of claims 1-4, in which, in the formula of the substituted benzotriazolesulfonate, the halogen is chlorine, the alkali metal is sodium, and the alkyl is methyl, ethyl, propyl (n and i), butyl (s and t), or t-amyl.
Claim 9
Dependent Claim
32 words
A method as defined in claim 1, in which, in the formula of the substituted benzotriazolesulfonate: R 1 is hydrogen, X is sodium, and R 4 is n-propyl, i-propyl, s-butyl or benzyl.
Claim 10
Dependent Claim
28 words
A method as defined in claim 1, in which, in the formula of the substituted benzotriazolesulfonate: R 1 is hydrogen, X is sodium and R 4 is i-propyl.
Claim 11
Dependent Claim
35 words
A method as defined in claim 1, in which, in the formula of the substituted benzotriazolesulfonate: R 1 is hydrogen; R 4 is methyl, ethyl, propyl (n or i); butyl (s or t) or t-amyl.
Claim 12
Dependent Claim
10 words
The method of claim 10 wherein R 4 is t-butyl.
Claim 13
Dependent Claim
59 words
A fibre which has been treated against phototendering with an agent which comprises a substituted benzotriazolesulfonate of the following formula: ##STR12## wherein R 1 is hydrogen or halogen R 2 is --SO 3 X where X is hydrogen or an alkali metal, R 3 and R 5 are hydrogen, and R 4 is alkyl or benzyl; under acidic conditions.
Claim 14
Dependent Claim
59 words
A fibre which has been treated against phototendering with an agent which comprises a substituted benzotriazolesulfonate of the following formula: ##STR12## wherein R 1 is hydrogen or halogen R 2 is --SO 3 X where X is hydrogen or an alkali metal, R 3 and R 5 are hydrogen, and R 4 is alkyl or benzyl; under acidic conditions.
Claim 15
Dependent Claim
25 words
The fibre of claim 12 wherein R 1 is hydrogen; R 4 is methyl, ethyl, propyl (n or i), butyl (s or t) or t-amyl.
Claim 16
Dependent Claim
10 words
The fibre of claim 13 wherein R 4 is t-butyl.
Claim 17
Dependent Claim
12 words
The method of claim 1 wherein the fibre is a natural fibre.
Claim 18
Dependent Claim
12 words
The method of claim 1 wherein the fibre is a synthetic fibre.
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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) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |