Electron beam curable copolymer useful in recording media

摘要

Magnetic recording media have been made with a new class of binder resins having the formula <IMAGE> wherein the portion of the copolymer having the a subscript comprises 50 to 97 weight percent of the copolymer, the portion of the copolymer having the b subscript comprises 0 to 30 weight percent of the copolymer, the portions of the copolymer having the c and d subscripts combinec comprise, 0.1 to 20 weight percent of the copolymer, while d can be 0, R1 is an alkyl group selected from -CH3 and -(CH2)n1CH3 wherein n1=1-10, R2 is an alkylene group which may be -CH2)n1 or -CH2)n2(CH)(CH2)n3CH3, n2=1-4 and n3=0-4, R3 may be selected from -H and -CH3, n5=0 or 1, and X is a linking group which is stable under electron beam irradiation and may be, for example, <IMAGE> R4=C1-6 alkylene, for example, with the proviso that when d=0, there is at least one additional polymer in the binder. The above resins in which d is greater than 0 are electron beam curable, and recording media can be produced by using such binder resins and curing them by electron beam irradiation.