| abstract |
A pressure-sensitive copying material comprising a support having thereon a microencapsulated color former capable of forming a distinct color when reacted with an electron-accepting solid, the microencapsulated color former comprising at least one benzoxazine derivative represented by the formula (Ia) , A BENZODIOXANE DERIVATIVE REPRESENTED BY THE FORMULA (Ib) AND A MIXTURE THEREOF, WHEREIN R1, R2, R3, R4, R5 and X are as defined hereinafter. |