content_image/905067.jpg content_image/905070.jpg content_image/905068.jpg
Herein RA is as defined above. RLc1 2 and RLc1 3 are each independently a C$_{1 }$-C$_{10 }$ straight, branched or cyclic mon› ovalent hydrocarbon group, or RLc1 2 and RLc1 3 may bond together to form an aliphatic ring with the carbon atom to which they are attached. RLc1 4 is furandiyl, tctrahydro› furandiyl or oxanorbomanediyl, RLc1s is hydrogen or a C$_{1 }$-C$_{10 }$straight, branched or cyclic monovalent hydrocarbon group which may contain a heteroatom. 

Examples of the monomers from which the recurring units having formula (A-3)-22 are derived are shown below. Herein RA is as defined above. 

<img src='content_image/905067.jpg'>

<img src='content_image/905070.jpg'>

(A-3)-22 

<img src='content_image/905068.jpg'>

-continued 

