content_image/941577.jpg content_image/941578.jpg content_image/941579.jpg content_image/941584.jpg content_image/941583.jpg content_image/941582.jpg content_image/941581.jpg content_image/941580.jpg
When R" is a cyclic alkyl group ( cycloalkyl group), it preferably has 3 to 15 carbon atoms, more preferably 4 to 12 carbon atoms, and most preferably 5 to 10 carbon atoms. As examples of the cycloalkyl group, groups in which one or more hydrogen atoms have been removed from a monocy- cloalkane or a polycycloalkane such as a bicycloalkane, tri› cycloalkane or tetracycloalkane, which may or may not be substituted with a fluorine atom or a fluorinated alkyl group, may be used. Examples of such groups include groups in which one or more hydrogen atoms have been removed from a monocycloalkane such as cyclopentane or cyclohexane; and groups in which one or more hydrogen atoms have been removed from a polycycloalkane such as adamantane, nor› bomane, isobornane, tricyclodecane or tetracyclododecane. 

As examples of A", the same groups as those described above for A’ in general formula (3-1) can be given. A" is preferably an alkylene group of 1 to 5 carbon atoms, an oxygen atom (-0-) or a sulfur atom (-S-), and more preferably an alkylene group ofl to 5 carbon atoms or---0-. 20 As the alkylene group of 1 to 5 carbon atoms, a methylene group or a dimethylethylene group is preferable, and a meth› ylene group is particularly desirable. 

R $^{29 }$is the same as defined for R$^{29 }$in the aforementioned general formula (a2-0). 

In formula (a2-1), s" is preferably 1 or 2. 

Specific examples of structural units represented by gen› eral formulas (a2-1) to (a2-5) are shown below. In the formu- las shown below, R"’ represents a hydrogen atom, a methyl 30 group or a trifluoromethyl group. 

[Chemical Formula 33] 

<img src='content_image/941577.jpg'>

<img src='content_image/941578.jpg'>

<img src='content_image/941579.jpg'>

<img src='content_image/941584.jpg'>

<img src='content_image/941583.jpg'>

<img src='content_image/941582.jpg'>

<img src='content_image/941581.jpg'>

<img src='content_image/941580.jpg'>

-continued 

