公开(公告)号：US3573957A

公开(公告)日：1971-04-06

申请号：US3573957D

申请日：1968-08-05

Applicant: IBM

Inventor： FINDLAY HUGH T ,  MACK ROSZELL JR

IPC: B41M5/10 ,  C08J9/28

CPC classification number: B41M5/10 ,  C08J9/28 ,  C08J2201/0502 ,  Y10T428/249996

Abstract: A POROUS, INK CONTAINING TRANSFER MEDIUM IS PREPARED BY COATING THE SURFACE OF A POLYMER FILM, SUCH AS A POLYAMIDE, WITH A PORE FORMING AGENT, SUCH AS AMMONIUM BICARBONATE, CONTAINED IN A SOLVENT SUCH AS ETHANOL, WHICH IS AT LEAST A PARTIAL SOLVENT FOR THE POLYMER FILM, TO IMPREGNATE A PORTION OF THE PORE FORMING AGENT INTO THE SURFACE OF THE POLYMER FILM. THE SOLVENT IS REMOVED AND THE FILM IS HEATED TO CAUSE THE PORE FORMING AGENT TO VAPORIZE AND FORM AN OPEN PORED CAPILLARY STRUCTURE IN THE SURFACE OF THE FILM. THE MARKING MATERIAL CAN BE INCORPORATED EITHER WITH THE PORE FORMING EITHER WITH THE PORE FORMING AGENT OR AFTER THE OPEN PORED CAPILLARY STRUCTUE HAS BEEN FORMED.