content_image/906972.jpg content_image/906969.jpg content_image/906970.jpg content_image/906971.jpg content_image/906973.jpg content_image/906974.jpg content_image/906975.jpg content_image/906980.jpg content_image/906981.jpg content_image/906982.jpg content_image/906983.jpg content_image/906976.jpg content_image/906977.jpg content_image/906978.jpg content_image/906979.jpg content_image/906984.jpg content_image/906985.jpg content_image/906986.jpg
are the same as mentioned above with respect to the alkyl group and cycloalkyl group represented by each ofR$_{201}$, R 202 and R$_{203 }$of general formula (ZI) above. 

[0308] As the alkylene group represented by A, there can be mentioned an alky lene group having 1 to 12 carbon atoms ( for example, a methylene group, an ethylene group, a propylene group, an isopropylene group, a butylene group or an isobu› tylene group). As the alkenylene group represented by A, there can be mentioned an alkenylene group having 2 to 12 carbon atoms (for example, an ethynylene group, a prope› nylene group or a butenylene group). As the arylene group represented by A, there can be mentioned an arylene group having 6 to 10 carbon atoms (for example, a phenylene group, a tolylene group or a naphthylene group). 

[0309] Especially preferred examples of the acid genera› tors will be shown below. 

<img src='content_image/906972.jpg'>

<img src='content_image/906969.jpg'>

<img src='content_image/906970.jpg'>

<img src='content_image/906971.jpg'>

<img src='content_image/906973.jpg'>

<img src='content_image/906974.jpg'>

<img src='content_image/906975.jpg'>

<img src='content_image/906980.jpg'>

<img src='content_image/906981.jpg'>

<img src='content_image/906982.jpg'>

<img src='content_image/906983.jpg'>

<img src='content_image/906976.jpg'>

<img src='content_image/906977.jpg'>

<img src='content_image/906978.jpg'>

<img src='content_image/906979.jpg'>

<img src='content_image/906984.jpg'>

<img src='content_image/906985.jpg'>

<img src='content_image/906986.jpg'>

