| 摘要 |
<p>1520910 Photopolymerizable compositions comprising phosphonate esters as initiators CIBA-GEIGY AG 19 Dec 1975 [24 Dec 1974 26 Nov 1975] 52201/75 Heading C3P [Also in Division C2] A photopolymerizable system comprising one or more unsaturated polymerizable compounds contains as photoinitiator 0À1 to 20 per cent by weight of a phosphonate ester I having the formula wherein X is H, C1-C4 alkyl, C2 or C3 hydroxyalkyl, C2 or C3 haloalkyl, C3-C8 alkoxyalkyl, C3 or C4 alkenyl, C5-C7 cycloalkyl, C7 or C8 aralkyl, phenyl or substituted phenyl, 2-tetrahydrofuranyl, 2-tetrahydropyranyl, 2-(6-methoxy)-tetrahydropyranyl, or a phosphonoalkyl group of the formula Y is H, C1-C4 alkyl, C3 or C4 alkenyl, C5-C7 cycloalkyl, C7 or C8 aralkyl, phenyl or substituted phenyl, or a phosphonoalkyl group of formula or a phosphonoalkoxy group of formula each of R1, R2, R3 and R4 independently represents alkyl of 1 to 4 carbon atoms, haloalkyl of 2 or 3 carbon atoms, alkoxyalkyl or 3 to 8 carbon atoms, cycloalkyl of 5 to 7 carbon atoms, aralkyl of 7 or 8 carbon atoms, or phenyl or substituted phenyl, or R1 and R2 together, or R3 and R4 together, represent a branched or unbranched alkyl radical of 2 to 7 carbon atoms, each of R5 and R6 independently represents hydrogen, alkyl of 1 to 4 carbon atoms or phenyl, each of R7 and R6 independently represents hydrogen, alkyl or alkoxy of 1 to 4 carbon atoms, halogen or phenyl and n is 2 or 3, with the proviso that at least one of the radicals X and Y represents a phosphonoalkyl or phosphonoalkoxy group as defined herein, and with the further proviso that when Y is a phosphonoalkoxy group X is a phosphonoalkyl group. The phosphonates I may be used in conjunction with appropriate unsaturated polymers, e.g. unsaturated polyamides for obtaining relief moulds for printing purposes or may be used as photoinitiators in the U.V. drying of printing ink compositions. Compositions exemplified contain methyl acrylate, trimethylol propane triacrylate or a mixture of unsaturated polyester and styrene and a phosphonate ester of the above formula in which R7 and R8 are hydrogen, Y is and X, R3 and R4 are selected from various radicals including alkyl, chloroethyl and methoxyethyl.</p> |
