Thioxanthone derivatives of the general formula I ##STR1## wherein R.sup.1 wherein R.sup.1 represents a halogen atom or a C.sub.1-10 alkoxy group, R.sup.2 and R.sup.4 each represent a hydrogen atom, a halogen atom or a C.sub.1 -C.sub.6 alkyl group, X represents oxygen or sulphur, and R.sup.3 represents a C.sub.1 -C.sub.10 alkyl group optionally substituted by a hydroxy group which hydroxy group may be alkylated by an optionally substituted C.sub.1-6 alkyl, C.sub.1-6 alkenyl or a benzyl group or acylated by a C.sub.1-8 alkanoyl or C.sub.1-8 alkenoyl group, a C.sub.1-10 alkenyl group, a C.sub.3 -C.sub.6 cycloalkyl group, a C.sub.1 -C.sub.8 alkanoyl group, a C.sub.1-8 alkenoyl group, an optionally substituted phenyl group, an optionally substituted benzyl group or an optionally substituted benzoyl group. Process for the preparation of the above thioxanthones, their use as photoinitiators, photopolymerisable compositions containing them, the use of such compositions for the production of photocured surface coating and products on which these photocured compositions have been applied.
通式I的噻
吖啶衍
生物##STR1##其中R.sup.1代表卤素原子或C.sub.1-10烷氧基,R.sup.2和R.sup.4分别代表氢原子,卤素原子或C.sub.1-C.sub.6烷基,X代表氧或
硫,R.sup.3代表C.sub.1-C.sub.10烷基,可选择地被羟基取代,该羟基可被一个可选择取代的C.sub.1-6烷基,C.sub.1-6烯基或苄基烷基化或被C.sub.1-8烷酰基或C.sub.1-8烯酰基基酰化,C.sub.1-10烯基,C.sub.3-C.sub.6环烷基,C.sub.1-C.sub.8烷酰基,C.sub.1-8烯酰基,可选择取代的苯基,可选择取代的苄基或可选择取代的苯甲酰基。制备上述噻
吖啶的过程,其用作光
引发剂,含有它们的光聚合组合物,使用这种组合物用于生产光固化表面涂层和应用这些光固化组合物的产品。