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Use of substituted 2-(2'-hydroxyaryl)-2H-benzotriazolesulfonates as photostabilizing agents for natural and synthetic fibres
| Details |
Inventors: Evans, Neil A.; Leaver, Ian H.; Rosevear, Judi; Waters, Peter J.; Wilshire, John F. K.;
Assignee: Board of Regents, U T Systems (Austin, TX)
Primary Examiner: Clingman; A. Lionel
Assistant Examiner:
Attorney, Agent or Firm: Arnold, White & Durkee
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.sub.1 is hydrogen or halogen, R.sub.2 is hydrogen or alkyl, R.sub.3 is hydrogen or hydroxy, R.sub.4 is --SO.sub.3 X where X is hydrogen or an alkali metal, and R.sub.5 is hydrogen, with the proviso that R.sub.2 is not methyl when R.sub.1 and R.sub.3 are hydrogen; or (II) R.sub.1, R.sub.3 and R.sub.4 are hydrogen, R.sub.2 is --SO.sub.3 X where X is hydrogen or an alkali metal, and R.sub.5 is --OR.sub.6 where R.sub.6 is hydrogen or alkyl; or (III) R.sub.1 is hydrogen or halogen, R.sub.2 is --SO.sub.3 X where X is hydrogen or an alkali metal, R.sub.3 and R.sub.5 are hydrogen, and R.sub.4 is hydrogen, alkyl or benzyl; or (IV) R.sub.1 is --SO.sub.3 X where X is hydrogen or an alkali metal, R.sub.2 is alkyl, R.sub.3 and R.sub.5 are hydrogen, and R.sub.4 is hydrogen or alkyl; under acidic conditions. The method is particularly suitable for treating wool, silk and nylon fibres, including blends thereof. |
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DETAILED DESCRIPTION We claim: 1.
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.
sub.
1 is hydrogen or halogen, R.
sub.
2 is --SO.
sub.
3 X where X is hydrogen or an alkali metal, R.
sub.
3 and R.
sub.
5 are hydrogen, and R.
sub.
4 is alkyl or benzyl.
2.
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.
3.
A method as defined in claim 1, in which the fibre is treated for about 90 minutes at about 80.
degree.
C.
4.
A method as defined in claim 2, in which the fibre is treated for about 90 minutes at about 80.
degree.
C.
5.
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.
6.
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.
7.
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.
8.
A method as defined in claim 1, in which, in the formula of the substituted benzotriazolesulfonate: R.
sub.
1 is hydrogen, X is sodium, and R.
sub.
4 is n-propyl, i-propyl, s-butyl or benzyl.
9.
A method as defined in claim 1, in which, in the formula of the substituted benzotriazolesulfonate: R.
sub.
1 is hydrogen, X is sodium and R.
sub.
4 is i-propyl.
10.
A method as defined in claim 1, in which, in the formula of the substituted benzotriazolesulfonate: R.
sub.
1 is hydrogen; R.
sub.
4 is methyl, ethyl, propyl (n or i); butyl (s or t) or t-amyl.
11.
The method of claim 10 wherein R.
sub.
4 is t-butyl.
12.
A fibre which has been treated against phototendering with an agent which comprises a substituted benzotriazolesulfonate of the following formula: ##STR12## wherein R
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