Optical information recording medium
AssigneeFuji Photo Film Co., Ltd.
InventorsTakeshi Kakuta, Toshio Ishida, Takako Ozawa
Life of this patent
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Abstract
An optical information recording medium including a substrate having successively disposed thereon a recording layer, an interlayer, a pressure sensitive adhesive layer and a cover film in which information is recordable and reproducible by irradiating laser light and the pressure sensitive adhesive layer contains a polymer having a glass transition temperature Tg of 0° C. or lower, as well as a method for producing an optical information recording medium including adhering a cover layer to a surface of a recording layer so that a pressure sensitive adhesive layer is abutted on the surface of the recording layer, and an optical information recording medium produced by the method.
Claims20
An optical information recording medium comprising a substrate having successively disposed thereon a recording layer, an interlayer, a pressure sensitive adhesive layer and a cover film,
- wherein information is recordable and reproducible by irradiating laser light, and the pressure sensitive adhesive layer contains a polymer having a glass transition temperature Tg of 0° C. or lower.
A method for producing an optical information recording medium including a substrate having disposed thereon a recording layer to which a cover layer including a cover film provided with a pressure sensitive adhesive layer is adhered so that a surface of the recording layer is abutted on the pressure sensitive adhesive layer,
- the method comprising the steps of preparing the cover layer by forming a laminate by successively superimposing a first releasable film, the pressure sensitive adhesive layer, the cover film and a second releasable film and winding the laminate into a roll,
- wherein the first releasable film has a central surface average roughness (SRa) at a surface in contact with a surface of the pressure sensitive adhesive layer of 50 nm or less, a central surface average roughness (SRa) at an opposite surface of 100 nm or less, and a thickness of 20 μm or more.
An optical information recording medium including a substrate having disposed thereon a recording layer to which a cover layer including a cover film provided with a pressure sensitive adhesive layer is adhered so that a surface of the recording layer is abutted on the pressure sensitive adhesive layer,
- the optical information recording medium being produced by a method comprising preparing the cover layer by forming a laminate by successively superimposing a first releasable film, the pressure sensitive adhesive layer, the cover film and a second releasable film and winding the laminate into a roll,
- wherein the first releasable film has a central surface average roughness (SRa) at a surface in contact with a surface of the pressure sensitive adhesive layer of 50 nm or less, a central surface average roughness (SRa) at an opposite surface of 100 nm or less, and a thickness of 20 μm or more.
Dependencies are inferred from the claim text.