Process and apparatus for producing optical recording medium
View Patent ↗To produce an optical recording medium having a good concavo-convex shape whereby optical information recording/retrieving is stabilized. A process for producing an optical recording medium 100 provided with an interlayer 104 having a concavo-convex shape, which comprises a step of forming a recording layer 102 on a substrate 101 directly or via another layer; a step of placing a resin material layer 104 a and a stamper 110 having a concavo-convex shape for transfer, in this order on the recording layer 102 , and curing the resin material layer 104 a in this laminated state to obtain a bonded body 112 comprising the substrate 101 , the recording layer 102 , the resin material layer 104 a and the stamper 110 , and a step of separating the stamper 110 from the resin material layer 104 a so that the concavo-convex shape for transfer is transferred to the resin material layer 104 a , and applying surface modification treatment to promote the curing of the resin material layer 104 a , to form the interlayer 104.
1. A process for producing an optical recording medium comprising an interlayer having a concavo-convex shape, the process comprising:
(A) forming a first recording layer comprising an organic dye, on which information is to be recorded by applied light, on a substrate directly or via another layer, then
(B) placing a curable resin material layer, formed by coating by spin coating a precursor of the curable resin, followed by a stamper having a concavo-convex shape for transfer corresponding to the concavo-convex shape on the first recording layer directly or via another layer, then
(C) partially curing the curable resin material layer in the laminated state, thereby obtaining a bonded body comprising the substrate, the first recording layer, the curable resin material layer and the stamper, then
(D) separating the stamper from the curable resin material layer so that the concavo-convex shape for transfer is transferred to the curable resin material layer, and applying surface modification treatment to promote curing of the curable resin material layer having transferred the concavo-convex shape for transfer, thereby forming the interlayer, and then
(E) forming a second recording layer by applying a coating liquid comprising an organic dye on the surface of the interlayer.
2. The process of claim 1 , wherein the surface modification treatment is at least one selected from the group consisting of an irradiation treatment and a heat treatment.
3. The process of claim 1 or 2 , wherein the surface modification treatment is by ultraviolet irradiation with a dose of 50 to 1000 mJ/cm 2 .
4. The process of claim 1 or 2 , wherein the surface modification treatment is by a heat treatment at a heating temperature of 40 to 120° C.
5. The process of claim 1 or 2 , wherein the partial curing of the curable resin material layer in (C) is curing up to a half-cured state.
6. The process of claim 1 or 2 , wherein the stamper comprises a polycarbonate resin.
7. The process of claim 1 or 2 , wherein the curable resin material layer comprises a plurality of resin layers.
8. The process of claim 5 , wherein the curable resin material layer comprises a plurality of resin layers, and the partial curing of the outermost layer among the plurality of resin layers is curing up to a half-cured state.