: polydiethylene glycol bisallyl carbonate resin; polycarbonate resin; synthetic reins prepared from a copolymer formed by radical-polymerizing comonomers of formula I and II: ##STR8## wherein R4 is hydrogen or methyl, X1 and X2 are hydrogen or halogen other than fluorine, and m and n are both integers having a total between 0 and 8, inclusive; a resin material formed by radical polymerizing comon