METHOD OF PREVENTING YELLOWING IN FABRICS AND GARMENTS
The invention relates to methods of preventing yellowing of textiles comprising polyurethane foam and at least one phenolic antioxidant by contacting the textile with at least one aryl alkyl sulfonic acid salt and to textiles obtained by such methods.
1 . A method of preventing yellowing of textiles comprising polyurethane foam and at least one phenolic antioxidant, said method comprising contacting said textile with at least one aryl alkyl sulfonic acid salt.
2 . The method of claim 1 , wherein the aryl alkyl sulfonic acid salt is of the formula:
where R is an aryl group substituted with at least one C 3 to C 20 alkyl group; and Z+ is a cationic counter ion.
3 . The method of claim 2 , wherein R is aryl group substituted with at least one C 8 to C 16 alkyl group.
4 . The method of claim 2 , wherein Z+ is an alkali metal cation or an alkyl ammonium salt.
5 . The method of claim 1 , wherein the aryl alkyl sulfonic acid salt is an adduct of dodecylbenzenesulfonic acid with N,N-bis(2-hydroxyethyl)-N-methyl-(z)-9-octadecene-1-aminium chloride, an adduct of dodecylbenzenesulfonate with 2-aminoethanol or an adduct of dodecylbenzenesulfonate with 2,2,2-nitriltris(ethanol), and combinations thereof.
6 . The method of claim 1 , wherein the textile comprises at least two antioxidants.
7 . The method of claim 6 , wherein said antioxidant is 2,6-di-tert-butyl-4-methylphenol.
8 . The method of claim 1 , wherein said aryl alkyl sulfonic acid salt is contacted with said textile by applying a solution of aryl alkyl sulfonic acid salt to said textile.
9 . The method of claim 9 , wherein said solution has a concentration 5-30 g/l in an aqueous solution at pH 4-6.
10 . The method of claim 9 , where said textile is immersed in said solution.
11 . The method of claim 9 , wherein said solution is applied to said textile by spraying said solution onto said textile.
12 . The method of claim 9 , wherein said solution is applied to said textile by padding said solution onto the textile.
13 . The method of claim 1 , additionally comprising contacting said textile with a compound of the formula:
where Ra and Rb are each, independently, C 1 to C18 alkyl and M is K, Na, or Li.
14 . An article comprising polyurethane foam, at least one phenolic antioxidant, and at least one aryl alkyl sulfonic acid salt.
15 . The article of claim 14 , where the aryl alkyl sulfonic acid salt is wherein the aryl alkyl sulfonic acid salt is of the formula:
where R is an aryl group substituted with at least one C 3 to C 20 alkyl group; and Z+ is a cationic counter ion.
16 . The article of claim 15 , wherein R is aryl group substituted with at least one C 8 to C 16 alkyl group.
17 . The article of claim 15 , wherein Z+ is an alkali metal cation or an alkyl ammonium salt.
18 . The article of claim 14 , wherein the aryl alkyl sulfonic acid salt is an adduct of dodecylbenzenesulfonic acid with N,N-bis(2-hydroxyethyl)-N-methyl-(z)-9-octadecene-1-aminium chloride, an adduct of dodecylbenzenesulfonate with 2-aminoethanol or an adduct of dodecylbenzenesulfonate with 2,2,2-nitriltris(ethanol), and combinations thereof.
19 . The article of claim 14 additionally comprising a compound of the formula:
where Ra and Rb are each, independently, C 1 to C 18 alkyl and M is K, Na, or Li.
20 . The article of claim 14 that comprises a component of a brassiere.
21 . A brassiere comprising at least one foam component, said foam component comprising polyurethane foam, at least one phenolic antioxidant, and at least one aryl alkyl sulfonic acid salt.
22 . The brassiere of claim 21 , wherein the aryl alkyl sulfonic acid salt is wherein the aryl alkyl sulfonic acid salt is of the formula:
where R is an aryl group substituted with at least one C 3 to C 20 alkyl group; and Z+ is a cationic counter ion.