| abstract |
The content of the photo-curing monomer (A) of formula (1) and the photo-curable monomer (B) of formula (2) is 30/70 to 87/13, And 0.01 to 30 parts by weight based on 100 parts by weight of the total amount of the monomer (A) and the monomer (B), wherein the curing shrinkage is 4.5% or less. (Formula (1) of, R 1 is -CH = CH 2, -CH 2 CH 2 -O-CH = CH 2, -CH 2 -C (CH 3) = CH 2, or a glycidyl group; R 2, R 3 Is independently hydrogen or an alkyl group having 1 to 4 carbon atoms; In the formula (2), R 4 and R 5 are independently -O-CH═CH 2 , O-CH 2 CH 2 -O-CH═CH 2 , -O-CO-CH═CH 2 , -O -CO-C (CH 3) = CH 2, -O-CH 2 CH 2 -O-CO-CH = CH 2, -O-CH 2 CH 2 -O-CO-C (CH 3) = CH 2, Or a glycidyl ether group; R 6 , R 7 Independently represent hydrogen or an alkyl group having 1 to 4 carbon atoms.) |