Novel sulfonium salts useful as photoinitiators for cationic polymerization and for producing relief patterns and relief images have the general formula (I) ##STR1## where A.sup..crclbar. is a non-nucleophilic counterion, x is 1, 2 or 3, R is a hydrocarbon radical R' is arylene or substituted arylene, and R" is ##STR2## where R.sup.1, R.sup.2 and R.sup.3 are each alkyl or monohalogenated or polyhalogenated alkyl or R.sup.1 and R.sup.2 are each hydrogen or alkyl, and R.sup.3 is phenyl, alkenyl or cycloalkenyl, or R.sup.1 is hydrogen, and R.sup.2 and R.sup.3 form ethylenically unsaturated ring, or R.sup.1 and R.sup.2 are each hydrogen, alkyl, cycloalkyl or aryl, and R.sup.3 is alkoxy or R.sup.1 is hydrogen or alkyl and R.sup.2 and R.sup.3 are each alkoxy, aryloxy or substituted aryloxy.
具有通式(I)的新型磺鎵鹽可用作陽離子聚合的光引發劑,並用於製備浮雕圖案和浮雕圖像,其中A.sup..crclbar.是非亲核的反离子,x为1、2或3,R为烃基,R'为
芳烃或取代
芳烃,R"为##STR2##其中R.sup.1、R.sup.2和R.sup.3均为烷基或单卤代或多卤代烷基,或R.sup.1和R.sup.2分别为氢或烷基,R.sup.3为苯基、烯丙基或环烯基,或R.sup.1为氢,R.sup.2和R.sup.3形成
乙烯基不饱和环,或R.sup.1和R.sup.2分别为氢、烷基、环烷基或芳基,R.sup.3为烷氧基,或R.sup.1为氢或烷基,R.sup.2和R.sup.3分别为烷氧基、芳氧基或取代芳氧基。