Patent Number: 6,251,963

Title: Photoinitiator combinations

Abstract: Photoinitiator combinations comprising at least one compound of formula (I) ##STR1## R.sub.1 is C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or halogen; R.sub.2 is hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or halogen; R.sub.3 is, for example, C.sub.1 -C.sub.20 alkyl, cyclopentyl, cyclohexyl, phenyl-C.sub.1 -C.sub.4 alkyl, naphthyl or biphenylyl or an O--, S-- or N-containing 5- or 6-membered heterocyclic ring; and at least one compound of formula (II) ##STR2## R.sub.1 and R.sub.2 are as defined above; R.sub.9 is, for example, C.sub.1 -C.sub.20 alkyl, cyclopentyl, cyclohexyl, phenyl-C.sub.1 -C.sub.4 alkyl, naphthyl, biphenylyl or an O--, S-- or N-containing 5- or 6-membered heterocyclic ring; and R.sub.10 is, for example, C.sub.1 -C.sub.20 alkyl, C.sub.2 -C.sub.20 alkyl interrupted by one or more O atoms, cyclopentyl, cyclohexyl, phenyl-C.sub.1 -C.sub.4 alkyl, naphthyl, biphenylyl or an O--, S-- or N-containing 5- or 6-membered heterocyclic ring; are reactive photo hardeners causing only a low degree of yellowing in the cured substrates.

Inventors: Kohler; Manfred (Freiburg, DE), Wolf; Jean-Pierre (Maisprach, CH), Litzler; Andre (Spechbach-le-Bas, FR), Tolotti; Guido (Saronno, IT), Hoeck; Nils (Mullheim, DE)

Assignee: Ciba Specialty Chemicals Corporation

International Classification: C07F 9/32 (20060101); C08F 2/48 (20060101); C08F 2/46 (20060101); C07F 9/00 (20060101); C08F 2/50 (20060101); C09D 175/16 (20060101); C09D 175/14 (20060101); C09D 4/00 (20060101); C08F 222/10 (20060101); C08F 222/00 (20060101); C08F 002/46 (); C08F 002/50 (); C08F 002/16 (); C08K 003/22 (); C08L 067/00 (); C08L 075/16 ()

Expiration Date: 06/26/2018