Copolymers containing monomer units of formula  -(CH2-O-CHR-CH2-O-)- (I) and monomer of formula   -(CH2-CHR'-O-)-   (II) in which R = H, 1- 8C linear or branched alkyl or a group CH3c(-O-(CH2-CH2)n-O-CH2- in which n = 1-10 and R' = an aliphatic radical exhibiting unsaturation which is radical polymerisable but which is inert under cationic polymerisation conditions.
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