content_image/902115.jpg content_image/902113.jpg content_image/902114.jpg
Q represents an alkyl group, a cycloalkyl group, an alicy- clic group which may contain a hetero atom, an aromatic ring group which may contain a hetero atom, an amino group, an ammonium group, a mercapto group, a cyano group or an aldehyde group; 

the group represented by -M-Q is a group constituted of from 5 to 20 carbon atoms; and 

at least two ofQ, M andL$_{1 }$maybe bonded to each other to form a 5-membered ring or a 6-membered ring; 

further provided that the repeating unit represented by the general formula (I) is selected from the group consisting of the following repeating units: 

<img src='content_image/902115.jpg'>

<img src='content_image/902113.jpg'>

and 

the repeating unit represented by general formula (III-1) is selected from the group consisting of the following repeating units: 

<img src='content_image/902114.jpg'>

-continued 

