John G. Chernega - Stillwater MN
John A. Martens - North Oaks MN
Roger A. Olsen - Woodbury MN
Auburn B. Cottingham - late of Lake Elmo MN
Minnesota Mining and Manufacturing Company - Saint Paul MN
Magnetic recording media have been made with a new class of binder resins having the formula ##STR1## 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 combined comprise 0. 1 to 20 weight percent of the copolymer, while d can be 0,
R. sub. 1 is an alkyl group selected from --CH. sub. 3 and ##STR2## wherein n1=1-10, R. sub. 2 is an alkylene group which may be --CH. sub. 2). sub. nl or ##STR3## n2=1-4 and n3=0-4, R. sub. 3 may be selected from --H and --CH. sub. 3, n5=0 or 1, and X is a linking group which is stable under electron beam irradiation and may be, for example, ##STR4## R. sub. 4 =C1-6 alkylene, for example, with the proviso that when d=0, there is at least one additional polymer in the binder.