초록 ▼

The front side of at least one receptor sheet of a pressure-sensitive multi-part record unit comprises microporous material comprising a matrix consisting essentially of substantially water-insoluble thermoplastic organic polymer, a large proportion of finely divided, water-insoluble siliceous parti

The front side of at least one receptor sheet of a pressure-sensitive multi-part record unit comprises microporous material comprising a matrix consisting essentially of substantially water-insoluble thermoplastic organic polymer, a large proportion of finely divided, water-insoluble siliceous particles, and interconnecting pores.

대표청구항 ▼

In a pressure-sensitive multi-part record unit comprising: (a) at least one transfer sheet having a front side and a back side, said back side comprising: (1) a pressure-rupturable coating having entrapped therein a profuse number of minute liquid droplets comprising at least one leuco dye dissolved

In a pressure-sensitive multi-part record unit comprising: (a) at least one transfer sheet having a front side and a back side, said back side comprising: (1) a pressure-rupturable coating having entrapped therein a profuse number of minute liquid droplets comprising at least one leuco dye dissolved in solvent, (2) pressure-rupturable microcapsules containing at least one leuco dye dissolved in solvent, or (3) a combination thereof, wherein the leuco dye is reactive with finely divided, substantially water-insoluble siliceous particles upon contact therewith to form a color, and (b) at least one receptor sheet having a front side and a back side, said front side of said receptor sheet comprising said siliceous particles, the improvement wherein said front side of said receptor sheet comprises microporous material comprising: (c) a matrix consisting essentially of substantially water-insoluble thermoplastic organic polymer, (d) finely divided substantially water-insoluble filler particles, of which at least about 50 percent by weight are siliceous particles with which said leuco dye is reactive upon contact to form a color, said filler particles being distributed throughout said matrix and constituting from about 50 percent to about 90 percent by weight of said microporous material, and (e) a network of interconnecting pores communicating substantially throughout said microporous material, said pores on a coating-free and impregnant-free basis constituting at least about 35 percent by volume of said microporous material.