Process for improving the sun protection factor of cellulosic fibre material
AssigneeCiba Specialty Chemicals Corporation
InventorsGeorges Metzger, Fabienne Cuesta
Life of this patent
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Abstract
A process for improving the sun protection factor (SPF) of cellulosic fibre materials and blends thereof, which comprises contacting said materials with at least one compound of the formula (1) in which M is hydrogen, an alkali metal atom, ammonium or a cation formed from an amine; R1 and R1′ independently of each other are —NH—R3, —N(R3)2 or —O—R3, wherein R3 is aryl substituted by —CO—X—R5, wherein X is O or NH and R5 is optionally substituted C1-C4-alkyl, R2 is a group of formula —O—R4 wherein R4 is hydroxy alkyl, alkoxy alkyl or hydroxy alkoxy alkyl, and R2′ has the meaning of R1 or R2.
Claims13
A process for improving the sun protection factor (SPF) of cellulosic fibre materials and blends thereof, which comprises contacting said materials with at least one compound of the formula
- in which M is hydrogen, an alkali metal atom, ammonium or a cation formed from an amine;
- R1 and R1′ independently of each other are —NH—R3, wherein R3 is phenyl substituted by —CO—X—R5, wherein X is O or NH and R5 is 2-hydroxyethyl,
- R2 is a group of formula —O—R4 wherein R4 is alkoxy alkyl or hydroxy alkoxy alkyl, and R2′ has the meaning of R1 or R2 and
- additionally contacting said materials with at least one UV absorber selected from the group consisting of o-hydroxybenzophenone, o-hydroxyphenylbenzotriazole, 2-aryl-2H-benzotriazole, salicylic acid ester, substituted acrylonitrile, substituted acrylaminoethylene, nitrilohydrazone, o-hydroxyaryl-1,3,5-triazine, sulphonated 1,3,5-triazine and oxalic anilide UV absorbers and
- where the SPF achieved is between 16.0 and 24.2.
Dependencies are inferred from the claim text.