Patent ID: 8488432

Claim:
A polymer compound comprising polymerized units derived from a fumaric acid diester and polymerized units having a radical polvmerizable group in a side chain which is represented by the following formula (1): wherein each of R 1 and R 2 which are independent of each other, is a C 1-12 linear, branched or cyclic alkyl group which may have an etheric oxygen atom between carbon-carbon atoms, and some or all of the hydrogen atoms may be substituted by fluorine atoms; R 3 is a hydrogen atom, a methyl group or a fluorine atom; each of Sp 1 and Sp 2 which are independent of each other, is a single bond or a C 1-12 hydrocarbon group which may have, between carbon-carbon atoms and at the terminal on the main chain side, an ether bond, a sulfide bond, an ester bond, an amido bond, a thioester bond, a thioamido bond, a dithiocarboxylate ester bond, a carbonate ester bond, a urethane bond, a urea bond, an amino group, —O—CH 2 —CH(OH)—CH 2 —OCO— or —COO—CH 2 —CH(OH)—CH 2 —O—, and some or all of the hydrogen atoms may be substituted by fluorine atoms; R 4 is a monovalent organic group having a radical polymerizable group at its terminal; R 5 is a hydroxy group, an amino group, a mercapto group, a carboxy group or a glycidyloxy group; and l, m and n represent mol %, and l+m+n=100, 30≦l≦95, 5≦m≦70, and 0≦n≦30.