申请人:Polaroid Corporation
公开号:US04442290A1
公开(公告)日:1984-04-10
There are described novel compounds which are represented by the formula ##STR1## wherein R is ##STR2## A is sulfur or selenium; X represents the nonmetallic atoms necessary to form a nucleus which completes a five or six membered heterocyclic moiety; R.sub.1 is H or lower alkyl; R.sub.2 is H or a hydrolyzable group; and R.sub.3 is H, alkyl or a hydrolyzable group. The compounds are useful in photographic applications and provide controlled release of a photographically useful material during processing of photographic elements with an aqueous alkaline processing composition.
本发明涉及的是一种新颖的化合物,其化学式为 ##STR1## 其中 R 为 ##STR2## A 为硫或硒;X 代表形成一个五元或六元杂环基团所需的非金属原子核;R.sub.1 为 H 或低烷基;R.sub.2 为 H 或可水解基团;R.sub.3 为 H、烷基或可水解基团。这些化合物在摄影应用中非常有用,并在使用水性碱性处理组成物处理摄影元素时提供控制释放摄影有用物质的能力。