AbstractA copolymer series was synthesized for migration imaging applications from isobutyl methacrylate and isobutyl styrene such that each homopolymer and all copolymers had glass transition temperature (Tg) near 55°C. TheTgof poly (p‐isobutylstyrene) was predicted from literature values of similar polymers to be near 55°C. Poly (p‐isobutylstyrene) was synthesised by acetylation of isobutyl benzene, reduction ofp‐isobutylacetoph‐enone to the carbinol, dehydration top‐isobutylstyrene and free radical polymerisation to the polymer. TheTgof the homopolymer was 55°C, in excellent agreement with the predicted value. Copolymers of isobutyl methacrylate andp‐isobutyl styrene were synthesised and theirTg's measured across the series by DSC (57°C ± 5°C). refractive index temperature coefficient (42°C ± 5°C). The copolymer series was also characterised by melt vi