Colorless recording paper

Abstract

.Iadd.Described herein are transfer and manifolding sheets having upon their surface a coating containing a substantially colorless dye salt derived from an organic sulfinic acid and an arylmethane dye base characterized by a logarithmic dissociation constant below 7, which upon transfer to a suitable receiving sheet is dissociated to the intensely colored ionic form of the dye to furnish a colored print. .Iaddend.

Having described my invention, I claim: 
     
       1. A transfer sheet having upon its surface a coating containing a substantially colorless dye salt derived from an organic sulfinic acid and an arylmethane dye base characterized by a logarithmic dissociation constant below 7, which upon transfer to a suitable receiving sheet is dissociated to the intensely colored ionic form of the dye to furnish a colored print. 
     
     
       2. A transfer sheet having upon its surface a coating containing a substantially colorless dye salt derived from an organic sulfinic acid and an N,N'-alkylated-4,4'-diaminobenzhydrol, which upon transfer to a suitable receiving sheet is dissociated to the intensely colored ionic form of the dye to furnish a colored print. 
     
     
       3. A manifolding sheet comprising a web having a coating on one side thereof, said coating comprising a solvent and a colorless dye salt derived from an organic sulfinic acid and an arylmethane dye base characterized by a logarithmic dissociation constant below 7. 
     
     
       4. A manifolding sheet comprising a web having a coating on one side thereof, said coating comprising a solvent and a colorless dye salt derived from an organic sulfinic acid and an N,N'-alkylated-4,4'-diaminobenzhydrol. 
     
     
       5. A transfer sheet having upon its surface a coating containing a substantially colorless dye salt derived from hydrazoic acid and an arymethane dye base characterized by a logarithmic dissociation constant below 7, which upon transfer to a suitable receiving sheet is dissociated to the intensely colored ionic form of the dye to furnish a colored print. 
     
     
       6. A transfer sheet having upon its surface a coating containing a substantially colorless dye salt derived from hydrazoic acid and an N,N'-alkylated-4,4'-diamino benzhydrol, which upon transfer to a suitable receiving sheet is dissociated to the intensely colored ionic form of the dye to furnish a colored print. 
     
     
       7. A manifolding sheet comprising a web having a coating on one side thereof, said coating comprising a solvent and a colorless dye salt derived from hydrazoic acid and an arylmethane dye base characterized by a logarithmic dissociation content below 7. 
     
     
       8. A manifolding sheet comprising a web having a coating on one side thereof, said coating comprising a solvent and a colorless dye salt derived from hydrazoic acid and an N,N'-alkylated-4,4'-diaminobenzhydrol. 
     
     
       9. A transfer sheet having upon its surface a coating containing a substantially colorless dye salt wherein the cation is the intensely colored cation of an arylmethane dye base characterized by a logarithmic dissociation constant below 7 and the anion is chosen from the group consisting of hydrazoic acid anion and organic sulfinic acid anion. 
     
     
       10. A transfer sheet having upon its surface a coating containing a substantially colorless dye salt wherein the cation is an N,N'-alkylated-4,4'-diaminobenzhydryl cation and the anion is chosen from the group consisting of hydrazoic acid anion and organic sulfinic acid anion. 
     
     
       11. A transfer sheet having upon its surface a coating containing the substantially colorless salt of toluenesulfinic acid and 4,4'-Bis (Dimethylamino) benzhydrol. 
     
     
       12. A transfer sheet having upon its surface a coating containing the substantially colorless salt of xylenesulfinic acid and 4,4'-Bis (Dimethylamino) benzhydrol. 
     
     
       13. A transfer sheet having upon its surface a coating containing the substantially colorless salt of diethylbenzene-sulfinic acid and 4,4'-Bis (Dimethylamino) benzhydrol. 
     
     
       14. A manifolding sheet comprising a web having a coating on one side thereof, said coating comprising a solvent and a colorless dye salt wherein the cation is the intensely colored cation of an arylmethane dye base characterized by a logarithmic dissociation constant below 7 and the anion is an organic sulfinic acid anion. 
     
     
       15. The manifolding sheet of claim 14 wherein the coating comprises a hydrophobic fluid dispersed in the form of discrete droplets in a hydrophilic colloid binder. 
     
     
       16. The manifolding sheet of claim 14 wherein the coating comprises a hard waxy material and a hydrophobic plasticizing fluid of low ionizing power. .[.17. A recording paper comprising a base web consisting essentially of intermeshed paper fibers, said fibers impregnated with a recording composition containing as a constituent thereof a substantially colorless dye salt wherein the cation is the intensely colored cation of an arylmethane dye base characterized by a logarithmic dissociation constant below 7 and the anion is an organic sulfinic acid anion..]. .[.18. A recording paper comprising a base web consisting essentially of intermeshed paper fibers, said fibers impregnated with a recording composition containing as a constituent thereof a substantially colorless dye salt wherein the cation is an N,N'-alkylated-4,4'-diaminobenzhydryl cation and the anion is an organic sulfinic acid anion..].