Pressure-sensitive record sheet and method of making

Abstract

Abstract THERE IS PROVIDED BY THIS INVENTION A MINUTE, MULTIPLEDROPLET-RETAINING PRESSURE-RUPTURABLE CAPSULE UNIT FOR SUPPLYING MARKING LIQUID, THE USE OF WHICH IN A PAPER COATING CONSTITUTES A NEW METHOD OF AIDING IN THE PROTECTION OF MINUTE CAPSULES AGAINST ACCIDENTAL RUPTURE AND LOSS OF MARKING LIQUID UNTIL MARKING PRESSURES ARE APPLIED. THE CAPSULE UNIT COMPRISES A BOUNDING AND RETAINING MATRIX OF DEPOSITED POLYMER FILM MATERIAL IN WHICH THE DROPLETS ARE RETAINED IN RANDOM DISTRIBUTION, THE DROPLETS BEING OF TWO KINDS, DIFFERING IN SIZE AND MATERIAL. THE DROPLETS OF SMALLER SIZE ARE OF CONCENTRATED LIQUID MARKING MATERIAL, WHEREAS THE LARGER DROPLETS ARE OF A DILUENT FOR THE LIQUID OF THE SMALLER CAPSULES, SO, THAT, WHEN A CAPSULE IS SMASHED IN ITS ENTIRETY, IT RELEASES A LOW-VISCOSITY DILUTED MARKING LIQUID THAT QUICKLY DRIES ON PAPER BY EVAPORATION AND BY IMBIBITION. THE LARGER RETAINED DROPLETS PROTRUDE AND CAUSE BUMPS IN THE DEPOSITED MATRIX. WHEN THE UNITS ARE USED AS A COATING ON RECORD SHEET MATERIAL IN CLOSE JUXTAPOSITION, AS DRIED FROM AN APPLIED LIQ- UID COATING SLURRY OF THE UNITS, THE PROTUBERANCES OF THE LARGE DROPLETS PROTECT THE SMALLER DROPLETS FROM ACCIDENTAL PRESSURE-RELEASE BY SCUFFING TYPES OF CASUALLY-APPLIED HANDLING FORCES. THUS A SHEET OF PAPER SENSITIZED TO DIRECT PRINTING PRESSURE WITH A COATING OF THESE CAPSULE UNITS FOR USE AS PART OF A RECORD UNIT SYSTEM SHOWS BOTH EXCELLENT MARKING-LIQUID TRANSFER EFFICIENCY AND ACCIDENTAL-SMUDGE RESISTANCE-A MARKED IMPROVEMENT OVER PRESENT COMMERCIAL PAPERS COATED WITH CAPSULAR AGGREGATES HAVING DROPLETS OF UNIFORM SIZE AND COMPOSITION.

Inventors

• 👤 B Brockett
• 👤 F Weaver

Bibliographic Details