UV-absorbers for ophthalmic lens materials

A UV absorber of the formula

• wherein
• R1 and R3 independently=H;
• C1-C12 alkyl, optionally substituted;
• C1-C12 cycloalkyl, optionally substituted;
• phenyl, optionally substituted;
• or naphthyl;
• or R1 and R3 are linked through the optional (as designated by the dashed bonds) linking group R2 where R2 is a C1-C6 alkylene, optionally substituted;
• or R1, R2, and R3 taken together form an optionally substituted 1,2-phenyl, 1,2-naphthyl, or 2,3-naphthyl, wherein, in each case, the optional substituents are independently C1-C6 alkyl, C1-C6 alkoxy, OH, —Si(CH3)3, halogen, —(CH2CH2O)n—R10, or —(CH2CH(CH3)O)nR10;
• R10=H, —Si(CH3)3, or C1-C6 alkyl;
• R8=H or C1-C12 alkyl;
• and
• R9=H;
• C1-C12 alkyl, optionally substituted with OH;
• or
• R4=C1-C12 alkylene, (CH2CH2O)n, (CH2CH(CH3)O)n, or CH2CH2CH2(Si(CH3)2O)mSi(CH3)2CH2CH2CH2;
• X=nothing, O, NR7, or S, provided that if R4 is (CH2CH2O)n, or (CH2CH(CH3)O)n then X is nothing;
• R5=nothing, C(═O), C(═O)CjH2j, C1-C6 alkylene, phenyl, or C1-C6 alkylphenyl;
• C(═O)O, C(═O)OCjH2j, C(═O)NR7, C(═O)NR7CjH2j, C(═S)O, C(═S)OCjH2j, C(═S)NR7, C(═S)NR7CjH2j,
• n=2-10;
• j=1-6;
• m=1-9;
• R6=H or methyl;
• and
• R7=H, C1-C6 alkyl, or phenyl.