Patent ID: 7169826

Claim:
An optical fiber coating composition which comprises at least one ethylenically unsaturated polymerizable compound and a liquid photoinitiator blend, wherein the liquid blend consists essentially of (c) at least one bisacylphosphine oxide photoinitiator and (d) at least one monoacylphosphine oxide photoinitiator and (e) at least one α-hydroxy ketone photoinitiator wherein the (c):(d):(e) weight:weight:weight: ratio is between about 2:1:14 to about 5:2:17 or where the bisacylphosphine oxide photoinitiator is bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide or bis(2,4,6-trimethylbenzoyl)-(2,4-bis-pentyloxyphenyl)phosphine oxide, where the monoacylphosphine oxide photeinitiator is 2,4,6-trimethylbenzoylethexyphenylphosphine oxide or 2,4,6-trimethylbenzoyldiphenylphosphine oxide and the α-hydroxy ketone photoinitator is α-hydroxycyclohexylphenyl ketone or 2-hydroxy-2-methyl-1-phenyl-1-propanone.