Patent ID: 7442752

Claim:
An exo-rich norbornene-ester addition polymer, comprising norbornene-ester based repeating units derived from norbornene-ester based monomers represented by the following Chemical Formula 1, wherein the exo-rich norbornene-ester based addition polymer has a molecular weight (Mn) larger than 20,000 and comprises more than 50 mol % of exo isomer of the norbornene-ester based monomer repeating units: wherein m is an integer of 0 to 4; at least one of R 1 , R 2 , R 3 , and R 4 is a radical having an ester group; each of the other R 1 , R 2 , R 3 , and R 4 is hydrogen; C 1 to C 20 linear or branched alkyl, alkenyl, or vinyl; C 5 to C 12 cycloalkyl substituted by hydrocarbon or unsubstituted; C 6 to C 40 aryl substituted by hydrocarbon or unsubstituted; C 7 to C 15 aralkyl substituted by hydrocarbon or unsubstituted; C 3 to C 20 alkynyl; or halogen; and if R 1 , R 2 , R 3 , and R 4 are not radicals having an ester group, a hydrogen, or a halogen, R 1 and R 2 , or R 3 and R 4 are not connected or are connected to form a C 1 to C 10 alkylidene group, or R 1 or R 2 are not connected or are connected with R 3 or R 4 to form a C 4 to C 12 saturated or unsaturated cyclic group or a C 6 to C 17 aromatic group, and wherein the norbornene-ester based monomer is the ester of a norbornene based carboxylic acid.