Pyridine and pyrimidine substituted triazine UV absorbers
A compound of formula wherein V, W, X and Y represent N or CH, at least one of V, W, X and Y being N and at least two of V, W, X and Y being CH; and R 1 , R 2 and R 3 are each independently of the other hydrogen, C 1 -C 8 alkyl, C 1 -C 8 alkoxy, nitro, cyano, trifluoromethyl, halogen or hydroxy; with the proviso that the compounds of formulae are excluded, provides good lightfastness properties to textile fibre materials, in particular PES fibre materials.
1. A compound of formula
wherein X and W denote N and V and Y are CH; and
R 1 , R 2 and R 3 are each independently of the other hydrogen, C 1 -C 8 alkyl, C 1 -C 8 alkoxy, nitro, cyano, trifluoromethyl, halogen or hydroxy;
with the proviso that the compounds of formulae
are excluded.
2. The compound of formula (1) according to claim 1 , wherein R 1 is hydrogen or methoxy.
3. The compound of formula (1) according to claim 1 , wherein R 2 is hydrogen or hydroxy.
4. The compound of formula (1) according to claim 1 , wherein R 3 is hydrogen or methoxy.
5. The process for the preparation of a compound of formula (1) according to claim 1 , which comprises
(I) to prepare the 2-aryl-4H-1,3-benzoxazin-4-one (4) by acid-catalysed ring closure reaction of the salicylamide derivative (2) with the carboxylic acid (3),
and
(II) to react the thus obtained 2-aryl-4H-1,3-benzoxazin-4-one (4) with the amidine (5) to provide the triazine derivative of formula (1),
wherein R 1 , R 2 , R 3 , X, Y, V and W are as defined in claim 1 .
6. The process for the photochemical stabilisation of undyed, dyed or printed textile fibre material, which comprises treating the textile fibre material with a liquor containing at least one compound of formula (1) according to claim 1 .
7. The process according to claim 6 , wherein the textile fibre material comprises polyester fibres.
8. The process for the photochemical stabilisation of dyed textile fibre material according to claim 6 , wherein the compound of formula (1) is applied as a part of the dyeing liquor.