Hydroxyphenyltriazine co-stabilizers for stabilized polyesters

A composition comprising a polyester material,

• a) at least one compound of formula (A)
• wherein
• E1 is hydrogen;
• C1-C18 alkyl;
• C1-C18 alkyl substituted by 1, 2 or 3 radicals selected from the group consisting of —OH, C2-C18 alkenyloxy, —C(O)OX1 and —OC(O)X2 with X1 and X2 being independently C1-C18 alkyl;
• C3-C50 alkyl interrupted by oxygen;
• C3-C50 hydroxyalkyl interrupted by oxygen;
• or a group of formula (P)
• wherein, R, R′ and R″ independently of one another are C1-C18 alkylene;
• b is an integer in the range of 1 to 3;
• E2 is hydrogen or hydroxyl;
• E3, E4, E5, and E6 independently of one another are hydrogen;
• hydroxyl;
• C1-C18 alkyl;
• substituted or unsubstituted C1-C18 alkoxy;
• phenyl;
• phenyl substituted by 1, 2 or 3 C1-C4 alkyl;
• or a group of formula (Q)
• wherein T and U independently of one another are linear or branched C1-C18 alkyl;
• E7 independently of one another are hydrogen or C1-C8 alkyl;
• and
• b) at least one UV absorber.