Light stabilized coating compositions containing a mixture of 2-hydroxyphenylbenzotriazole and 2-hydroxyphenyltriazine

Claim 1

A coating composition which contains, as the UV absorber, a mixture of at least one 2-hydroxyphenylbenzotriazole and at least one 2-hydroxyphenyltriazine, wherein the 2-hydroxyphenylbenzotriazole has the formula 1a or 1b ##STR39## in which in formula 1a or 1b R 1 is hydrogen, alkyl having 1 to 24 carbon atoms, phenylalkyl having 1 to 4 carbon atoms in the alkyl moiety, R 2 is hydrogen, halogen, alkyl having 1 to 18 carbon atoms or phenylalkyl having 1 to 4 carbon atoms in the alkyl moiety, and R 3 is hydrogen, chlorine or alkyl having 1 to 4 carbon atoms; with at least one of the radicals R 1 and R 2 being other than hydrogen; T is hydrogen or alkyl having 1 to 6 carbon atoms, T 1 is hydrogen, chlorine or alkyl having 1 to 4 carbon atoms, n is 1 or 2, when n is 1, T 2 is chlorine or a radical of the formula--OT 3 , wherein T 3 is hydrogen, alkyl which has 1 to 18 carbon atoms and is unsubstituted or substituted by 1 to 3 hydroxyl groups; alkyl of 3 to 18 carbon atoms interrupted once or several times by --O-- and is unsubstituted or substituted by hydroxyl; alkenyl which has 2 to 18 carbon atoms and is unsubstituted or substituted by hydroxyl; phenylalkyl having 1 to 4 carbon atoms in the alkyl moiety, or a radical of the formula --CH 2 CH(OH)--T 7 or glycidyl; where T 7 is hydrogen, alkyl having 1 to 18 carbon atoms or phenyl, and when n is 2, T 2 is a radical of the formula --O--T 9 --O--, wherein T 9 is alkylene having 2 to 8 carbon atoms, alkenylene having 4 to 8 carbon atoms, cyclohexylene, alkylene which has 2 to 8 carbon atoms and is interrupted once or several times by --O--; and in which in formula 2 u is 1 or 2 r is an integer from 1 to 3 the substituents Y 1 independently of one another are hydrogen, hydroxyl, halogenomethyl, alkyl having 1 to 12 carbon atoms, alkoxy having 1 to 18 carbon atoms or halogen, when u is 1, Y 2 is alkyl having 1 to 18 carbon atoms, alkyl which has 1 to 12 carbon atoms and is substituted by --COOH, --COOY 8 , --CONH 2 , --CONHY 9 , --CONY 9 Y 10 , --CN, --OCOY 11 or mixtures thereof; alkyl which has 4 to 20 carbon atoms which is interrupted by one or more oxygen atoms and is unsubstituted or substituted by hydroxyl or alkoxy having 1 to 12 carbon atoms; alkenyl having 3 to 6 carbon atoms, glycidyl, phenylalkyl which has 1 to 5 carbon atoms in the alkyl moiety and is unsubstituted or substituted by hydroxyl, chlorine and/or methyl; --COY 12 or --SO 2 Y 13 , wherein Y 8 is alkyl having 1 to 18 carbon atoms, alkenyl having 3 to 18 carbon atoms, alkyl which has 3 to 20 carbon atoms and is interrupted by one or more oxygen atoms or said alkyl substituted by hydroxyl; alkenyl having 3 to 18 carbon atoms, glycidyl or phenylalkyl having 1 to 5 carbon atoms in the alkyl moiety, Y 9 and Y 10 independently of one another are alkyl having 1 to 12 carbon atoms, alkoxyalkyl having 3 to 12 carbon atoms, dialkylaminoalkyl having 4 to 16 carbon atoms or cycloalkyl having 5 to 12 carbon atoms, Y 11 is alkyl having 1 to 18 carbon atoms, alkenyl having 2 to 18 carbon atoms or phenyl, Y 12 is alkyl having 1 to 18 carbon atoms, alkenyl having 2 to 18 carbon atoms, phenyl, alkoxy having 1 to 12 carbon atoms, phenoxy, alkylamino having 1 to 12 carbon atoms or phenylamino, and Y 13 is alkyl having 1 to 18 carbon atoms, phenyl or alkylphenyl having 1 to 8 carbon atoms in the alkyl radical; and when u is 2, Y 2 is alkylene having 2 to 16 carbon atoms, alkenylene having 4 to 12 carbon atoms, xylylene, alkylene which has 3 to 20 carbon atoms and is interrupted by one or more --O-- atoms and/or is substituted by hydroxyl; --CH 2 CH(OH)CH 2 --O--Y 15 --OCH 2 CH(OH)CH 2 -- or --(CH 2 ) m --CO 2 --Y 18 --OCO--(CH 2 ) m --, in which m is 1, 2 or 3, wherein Y 15 is alkylene having 2 to 10 carbon atoms, phenylene or a group phenylene-M-phenylene in which M is --O--, --S--, --SO 2 --, --CH 2 -- or --C(CH 3 ) 2 --, and Y 18 is alkylene having 2 to 10 carbon atoms or alkylene which has 4 to 20 carbon atoms and is interrupted once or several times by oxygen.