Patent ID: 8912287

Claim:
A method for producing a polymer, the method comprising: polymerizing, at a temperature of 210° C. or lower, a mixture comprising: a monomer (a1), and a monomer component (a2) comprising at least 50 wt % of methyl methacrylate, to obtain a first polymer; and then, polymerizing, at a temperature of 210° C. or lower, a second mixture comprising the first polymer and a further monomer component (a2′) comprising at least 50 wt % of methyl methacrylate, wherein the second mixture comprises from 0.01 to 35 mol % of the monomer (a1), which has formula (1): wherein, R 1 is a hydrogen atom or a methyl group, X is an oxygen atom, an imino group, a group having formula (2), or a group having formula (3): wherein, in formula (2), n is an integer of 1 to 10, and R 4 and R 5 are each independently a hydrogen atom or a methyl group, with the proviso that at least one of R 4 and R 5 is a hydrogen atom, wherein, in formula (3), n is an integer of 1 to 10, R 2 and R 3 are each independently a hydrogen atom, a linear alkyl group with a carbon number of 1 to 8, a branched alkyl group with a carbon number of 1 to 8, an optionally substituted alicyclic hydrocarbon with a carbon number of 6 to 8, or R 2 and R 3 together form an optionally substituted cyclic structure.