Reactivity of triethyl phosphite with tetrachloromethane : electron transfer versus ionic substitution on “positive” halogen
作者:Salem Bakkas、Michel Julliard、Michel Chanon
DOI:10.1016/s0040-4020(01)89983-x
日期:1987.1
the first therefore suggests a radical mechanism but not the second.However in this particular case even the results obtained with the tris(cyclopropylnethyl) phosphite may be rationalized also by an ionic mechanism. For the photostimulated reaction [1] , the overall quantum yield is 0.1. The electrochemical oxidation of 1 with added CCI4 does not account for a radical chain process as the main pathway
Three-component aqueous processable, positive-working photopolymer compositions comprising (i) an unsaturated polymer comprising (a) about 20 to 1000 milliequivalents of reactive unsaturated carbon to carbon groups per 100 g of polyene and (b) about 10 to 50 mol percent of N-alkenylmaleimide units;
(ii) a reactive mercapto acid and
(iii) a radiation-sensitive, radical-generating initiator;
substrates coated with such compositions; and a photoimaging process.
N-alkylindolylidene and N-alkylbenzothiazolylidene alkanones as sensitizers for photopolymer compositions
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0103294A1
公开(公告)日:1984-03-21
Photopolymerizable compositions comprising (a) at least one ethylenically unsaturated compound, (b) at least one photoinitiator or photoinitiator system, (c) sensitizing amount of an N-alkylindolylidene or N-alkylbenzothiazolylidene alkanone as defined, and optionally (d) at least one organic polymeric binder. The compositions, in layer form are useful in printing plates, litho films, photoresists, solder mask and for making image proofs. The products show sensitization to visible light.