PURPOSE: To provide the titled film with which a colorless transparent protective film can be easily provided on a color-printed surface, wherein a resin layer only a heated part of which can be easily welded to the surface of a copying paper and released from the base is provided on the base.
CONSTITUTION: A thin film B of a resin not adhesive to the heat-resistant base A such as a polyester film, e.g., a cellulose acetate resin, is provided on the surface of the base A, or the surface of the base A is subjected to a releasing treatment. Thereafter, a resin layer C in which a sublimable dye or the like is diffused or sorbed and only a heated part of which can be easily welded to the surface of a copying paper and released from the base A to form a transparent protective layer, is provided thereon to produce the objective cover film. A porous foamed material, a resin having dispersed therein a powder of a resin having high transparency and a distinct melting point or softening point, a paraffin wax or the like is preferably used for forming the resin layer C.
EFFECT: The cover film can be supplied as a connected body, and operating efficiency is enhanced.
ABE TETSUYA
SHINOHARA SATORU
FUJIWARA YOSHIO
| JPS5019436A | 1975-02-28 | |||
| JPS4968828A | 1974-07-03 | |||
| JPS5613173A | 1981-02-09 | |||
| JPS57105395A | 1982-06-30 | |||
| JPS58110286A | 1983-06-30 |
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