| 摘要 |
Photopolymerisable compsn. contains >=1 constituent which is polymerisable or hardenable by acids and a photosensitiser having the formula: where A is S, Se or Te; n is 1 or 2; R1, R2, and R3 are each independently an opt. substd. hydrocarbyl radical or a heterocyclic radical or two of R1, R2 and R3 form a heterocycle with A and the other one of them is hydrocarbyl; Xn- is the anion of an acid which is able to polymerise or harden the above constituent. The compsns. are used for printing plates, printed circuits etc. The compsns. can be stored for long time in the dark without gelification and therefore do not require an inhibitor in this respect. Also the compsn. avoids the use of toxic cpds. such as transition metal carbonyls and N-nitrosamines used in previous process. |
