Preferred examples of the carboxylic acid groups- containing monomer represented by the general formula (5)  are as follows.  Preferred examples of the carboxylic acid groups› containing monomer represented by the general formula (6)  are as follows.  13  5,925,690  14  -continued  R1  C02H  I  I  CH2=C-C02-+CH2¾-CH  I  C02H  R1  C02H  I  I  CH2=C-C02-+CH2°1ToCH  I  C02H  -continued  R1  C02H  I  I  CH2=C-C02-+CH2°1ITCH  I  C02H  R1  C02H  I  I  CH2=C-C02-+CH2¾CH  I  C02H  R1  COCl  I  I  CH2=C-C02-+CH2°1ToCH  I  COCl  R1  C02H  C02H  I  I  I  CH2 = C-CO2-+ CH2  +;;- CH - CO-+ CH2  +;;- CH  11  I  0  C02H  R1  C02H  C02H  I  I  I  CH2 = c-CO2-+ CH2  °1To  CH-co-+ CH2 ti-a CH  II  I  0  C02H 