| 摘要 |
PURPOSE:To obtain a highly cyanoethylated pullulan which, when used as a binder for an EL element, can impart high brightness and long life to the EL element CONSTITUTION:A cyanoethylated pullulan having a degree of cyanoethyl- substitution of 50-90% is cyanoethylated in a nonaqueous medium in the presence of a basic catalyst to produce a highly cyanoethylated pullulan having a degree of cyanoethyl-substitution of 95-100%, which has been difficult to attain by any conventional method. |
