A photochromic photosensitive composition contains a benzothiazolinospiropyran compound represented by the general formula: ##STR1## wherein R.sub.1 represents an alkyl group containing 1 to 10 carbon atoms, R.sub.2 represents an alkyl group containing 1 to 10 carbon atoms or a phenyl group, R.sub.3 represents a hydrogen atom, a halogen atom, a methoxy group or an alkyl group containing 1 to 5 carbon atoms, and R.sub.4 represents a hydrogen atom, an alkyl group containing 1 to 5 carbon atoms, a methoxy group or a methylthio group, dissolved or dispersed in a bisphenol A type polyether resin for enhancing thermal stability of the compound in a colored state. Addition of a phenol to the composition serves to further enhance the heat stability. As compared with conventional photochromic compositions, this photochromic photosensitive composition is thermally extremely stable in a colored state, and the developed color image can be stored for an enough long time to be suited for long-time recording.
一种光致变色光敏组合物,包含一个由通式表示的
苯并噻唑啉螺
吡喃化合物:##STR1## 其中R.sub.1代表含有1至10个碳原子的烷基,R.sub.2代表含有1至10个碳原子或苯基的烷基,R.sub.3代表氢原子、卤素原子、甲氧基或含有1至5个碳原子的烷基,R.sub.4代表氢原子、含有1至5个碳原子的烷基、甲氧基或甲
硫基甲基,溶解或分散在
双酚A型聚醚
树脂中,以增强化合物在有色状态下的热稳定性。向组合物中添加
酚可进一步提高热稳定性。与传统的光致变色组合物相比,这种光致变色光敏组合物在有色状态下热稳定性极高,所形成的彩色图像可以存储足够长的时间,适合长时间记录。