may be made by way of non limiting example of glycidyl methacrylate and tert butyl methacrylate advantageously m is formed from at least 60 syndiotactic pmma advantageously the t g of b is below 0 u00b0 c and preferably below u2212 40 u00b0 c the monomer used to synthesize the elastomeric block b may be a diene selected from butadiene isoprene 2 3 dimethyl 1 3 butadiene 1 3 pentadiene and 2 phenyl 1 3 butadiene advantageously b is selected from poly dienes especially poly butadiene poly isoprene and random copolymers thereof or else from partially or completely hydrogenated poly dienes among polybutadienes it is advantageous to use those whose t g is the lowest for example 1 4 polybutadiene having a t g about u00b0 c below that of 1 2 polybutadiene about 0 u00b0 c the blocks b may also be hydrogenated this hydrogenation is carried out using standard techniques the monomer used to synthesize the elastomeric block b may also be an alkyl meth acrylate the following t g s given in brackets which follow the name of the meth acrylate are obtained ethyl acrylate u2212 24 u00b0 c butyl acrylate u2212 54 u00b0 c 2 ethylhexyl acrylate u2212 85 u00b0 c hydroxyethyl acrylate u2212 15 u00b0 c and 2 ethyhexyl methacrylate u2212 10 u00b0 c it is advantageous to use butyl acrylate the acrylates are different from.