Process for improving the photochemical stability of dyeings and prints on polyester fibres
AssigneeCiba Specialty Chemicals Corporation
InventorFrancesco Fuso
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Abstract
A process for the photochemical stabilization of dyeings and prints on polyester fibre material, which comprises treating the polyester fibre material with a compound of formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, n and m are as defined herein. The treated dyed or printed polyester fibre material is distinguished by good fastness to light and heat and has a high sun protection factor.
Claims12
A process for the photochemical stabilisation of dyeings and prints on polyester fibre material, which comprises treating the polyester fibre material with a compound of formula ##STR11## wherein R.sub.1 and R.sub.2 are each independently of the other hydrogen;
- C.sub.1 -C.sub.4 alkyl;
- C.sub.1 -C.sub.4 alkoxy, halogen, allyloxy or benzyloxy,
- R.sub.3 is C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxy-substituted C.sub.1 -C.sub.4 alkyl,
- R.sub.4 is hydrogen, unsubstituted or phenyl-substituted C.sub.1 -C.sub.4 alkyl or allyl, and
- n and m are each independently of the other 1, 2 or 3, with the proviso that if R.sub.1 is a C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or a halogen, then R.sub.2 and R.sub.4 cannot simultaneously be hydrogen.
Dependencies are inferred from the claim text.