Patent ID: 8329775

Claim:
An azo compound of the formula wherein R 1 =C(O)CH═CH 2 , C(O)C(CH 3 )═CH 2 , C(O)NHCH 2 CH 2 OC(O)C(CH 3 )═CH 2 , or C(O)NHC(CH 3 ) 2 C 6 H 4 C(CH 3 )═CH 2 ; R 2 =H, C 1 -C 4 alkyl, or C 1 -C 4 alkoxy; R 3 =H, C 1 -C 4 alkyl, F, Cl, Br, CN, NO 2 , COOR 4 ; XOC(O)CH═CH 2 , XOC(O)C(CH 3 )═CH 2 , XOC(O)NHCH 2 CH 2 OC(O)C(CH 3 )═CH 2 , or XOC(O)NHC(CH 3 ) 2 C 6 H 4 C(CH 3 )═CH 2 ; R 4 =H or C 1 -C 4 alkyl; and X=C 1 -C 4 alkyl or C 2 -C 4 alkenyl.