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Heat transfer cover films
| Details |
Inventors: Oshima, Katsuyuki; Ando, Jitsuhiko; Torii, Masanori;
Assignee: Dai Nippon Insatsu K.K. (JP)
Primary Examiner: Hess; Bruce H.
Assistant Examiner:
Attorney, Agent or Firm: Parkhurst & Wendel
A heat transfer sheet comprising a polyester film substrate sheet, an adhesive layer formed on one surface of the substrate sheet by applying the adhesive layer to the substrate sheet and biaxially stretching both the layer and the sheet simultaneously, and at least two heat transfer layers formed on said adhesive layer, a first layer comprising a thermally migratable dye and an untransferable binder, and second layer comprising a dyed or pigmented, heat-meltable binder. |
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DETAILED DESCRIPTION We claim: 1.
A heat transfer sheet, comprising: a polyester film substrate sheet; an adhesive layer formed on one surface of said substrate sheet by applying the adhesive layer to the substrate sheet and biaxially stretching both the layer and the sheet simultaneously; and at least two heat transfer layers formed on said adhesive layer, a first layer comprising a thermally migratable dye and an untransferable binder, and a second layer comprising a dyed or pigmented, heat-meltable binder.
2.
The heat transfer sheet of claim 1, wherein said polyester film is a polyethylene terephthalate or polyethylene naphthalate film.
3.
The heat transfer sheet of claim 1, wherein said adhesive layer has a thickness of 0.
001 to 1 .
mu.
m.
4.
The heat transfer sheet of claim 1, further comprising a release protective layer interleaved between said second heat transfer layer and said substrate sheet.
5.
The heat transfer sheet of claim 4, wherein said release protective layer comprises a water soluble polymer.
6.
The heat transfer sheet of claim 1, further comprising a heat-sensitive adhesive layer formed on a surface of said second heat transfer layer.
7.
The heat transfer sheet of claim 6, wherein said second heat transfer layer or said heat-sensitive adhesive layer formed thereon is highly adhesive to a vinyl chloride base resin.
8.
The heat transfer sheet of claim 1, further comprising a heat-resistant slip layer on another surface of said substrate sheet opposed from said one surface thereof.
Description:
TECHNICAL FIELD The present invention relates to a heat transfer cover film.
More particularly, the present invention relates to a heat transfer cover film enabling heat transferred images to be improved in terms of such durability as rub resistance and allowing them to develop color and luster so well.
The present invention also concerns a heat transfer process making use of such cover films.
BACKGROUND TECHNIQUE So far, heat transfer techniques have been widely used for simple and expeditious printing
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Manufacturing Materials 
