Transfer elements and process

Claim 2

PRESSURE-SENSITIVE REUSABLE TRANSFER ELEMENT COMPRISING A FLEXIBLE FOUNDATION, BONDING LAYER ON SAID FOUNDATION AND A VOLATILE VEHICLE-APPLIED MICROPOROUS RESINOUS INK LAYER ADHERED TO SAID BONDING LAYER, CHARACTERIZED BY SAID BONDING LAYER COMPRISING A MIXTURE OF FROM ABOUT 20 TO 60 PARTS BY WEIGHT OF A WATER-SOLUBLE FILM-FORMING BINDER MATERIAL AND FORM ABOUT 80 TO 40 PARTS BY WEIGHT OF A WATER-INSOLUBLE, WATER-DISPERSIBLE FILM-FORMING BINDER MATERIAL.

Claim 3

Transfer element according to claim 1 in which said volatile vehicle-applied ink layer comprises a water-applied composition comprising polyvinyl alcohol as the resinous binder material.

Claim 4

Transfer element according to claim 1 in which said volatile vehicle-applied ink layer comprises a volatile organic solvent-applied composition comprising a vinyl chloride-vinyl acetate polymer as the resinous binder material and a lower aliphatic solvent as the organic solvent.

Claim 5

Transfer element according to claim 1 in which said water-soluble film-forming binder material is selected from the group consisting of polyethylene oxide, polyvinyl alcohol, polyvinyl pyrrolidone, methyl cellulose, ethyl hydroxyethyl cellulose, oxidized starch and casein.

Claim 6

Transfer element according to claim 1 in which said water-insoluble film-forming binder material is selected from the group consisting of polyvinyl acetate, acrylic polymers, polyvinylidene chloride, polystyrene and butadiene-styrene copolymers.

Claim 7

Transfer element according to claim 1 in which said foundation comprises paper.

Claim 8

PROCESS FOR PRODUCING PRESSURE-SENSITIVE REUSABLE TRANSFER ELEMENTS WHICH COMPRISES THE STEPS OF: A. COATING A FLEXIBLE FOUNDATION WITH A CONTINUOUS UNIFORM LAYER OF AN AQUEOUS COMPOSITION COMPRISING FROM ABOUT 20 TO 60 PARTS BY WEIGHT OF A WATER-SOLUBLE FILM-FORMING BINDER MATERIAL AND FROM ABOUT 80 TO 40 PARTS BY WEIGHT OF A WATER-DISPERSIBLE, WATER-INSOLUBLE FILM-FORMING BINDER MATERIAL, B. DRYING SAID LAYER BY EVVAPORATION OF THE WATER TO FORM A THIN BONDING LAYER ON SAID FOUNDATION, C. COATING THE SURFACE OF SAID BONDING LAYER WITH A CONTINUOUS UNIFORM LAYER OF INK COATING COMPOSITION COMPRISING A FILM-FORMING BINDER MATERIAL, AN INCOMPATIBLE OIL, COLORING MATTER AND A VOLATILE VEHICLE WHICH IS AT LEAST A PARTIAL SOLVENT FOR EITHER SAID WATER-SOLUBLE BINDER MATERIAL OR SAID WATER-INSOLUBLE BINDER MATERIAL OF SAID BONDING LAYER, AND D. DRYING SAID INK COATING BY EVAPORATION OF SAID VOLATILE VEHICLE TO FORM A MICROPOROUS STRUCTURE OF SAID FILM-FORMING BINDER MATERIAL SOLVENT-BONDED TO SAID BONDING LAYER AND CONTAINING WITHIN THE PORES THEREOF SAID INCOMPATIBLE OIL AND COLORING MATTER AS A PRESSURE-EXUDABLE INK.

Claim 9

PROCESS FOR PRODUCING PRESSURE-SENSITIVE REUSABLE TRANSFER ELEMENTS WHICH COMPRISES THE STEPS OF: A. COATING A FLEXIBLE FOUNDATION WITH A CONTINUOUS UNIFORM LAYER OF AN AQUEOUS COMPOSITION COMPRISING FROM ABOUT 20 TO 60 PARTS BY WEIGHT OF A WATER-SOLUBLE FILM-FORMING BINDER MATERIAL AND FROM ABOUT 80 TO 40 PARTS BY WEIGHT OF A WATER-DISPERSIBLE, WATER-INSOLUBLE FILM-FORMING BINDER MATERIAL, B. DRYING SAID LAYER BY EVVAPORATION OF THE WATER TO FORM A THIN BONDING LAYER ON SAID FOUNDATION, C. COATING THE SURFACE OF SAID BONDING LAYER WITH A CONTINUOUS UNIFORM LAYER OF INK COATING COMPOSITION COMPRISING A FILM-FORMING BINDER MATERIAL, AN INCOMPATIBLE OIL, COLORING MATTER AND A VOLATILE VEHICLE WHICH IS AT LEAST A PARTIAL SOLVENT FOR EITHER SAID WATER-SOLUBLE BINDER MATERIAL OR SAID WATER-INSOLUBLE BINDER MATERIAL OF SAID BONDING LAYER, AND D. DRYING SAID INK COATING BY EVAPORATION OF SAID VOLATILE VEHICLE TO FORM A MICROPOROUS STRUCTURE OF SAID FILM-FORMING BINDER MATERIAL SOLVENT-BONDED TO SAID BONDING LAYER AND CONTAINING WITHIN THE PORES THEREOF SAID INCOMPATIBLE OIL AND COLORING MATTER AS A PRESSURE-EXUDABLE INK.

Claim 10

Process according to claim 7 in which the volatile vehicle of the ink coating composition comprises water which is a solvent for the water-soluble binder material of the bonding layer.

Claim 11

Process according to claim 7 in which the volatile vehicle of the ink coating composition comprises a lower aliphatic solvent which is a solvent for the water-insoluble binder material of the bonding layer.

Claim 12

Process according to claim 9 in which the lower aliphatic solvent is selected from the group consisting of lower aliphatic ketones and lower aliphatic esters.