摘要:
A high density information record of the electrostatic capacitance type comprising a record substrate on which signal information is recorded as geometric variations. The record substrate is made of a conductive resin composition comprising a vinyl chloride resin and a conductive powder. The vinyl chloride resin is obtained by suspension polymerization of starting vinyl chloride monomer in an aqueous solution of a water-soluble polymer suspension stabilizer from which insoluble organic matters with sizes over 10 .mu.m have been removed.
摘要:
A methacrylate resin composition for optical information recording medium, excellent in releasability from mold, consisting of (A) 100 parts by weight of a methacrylate resin and (B) 0.1 to 3.0 parts by weight of a surface active agent having a fluoroalkyl group.
摘要:
A methacrylic resin having reduced water absorption properties, useful in optical instruments and as information recording substrates, is produced by polymerizing a mixture consisting of (A) 50 to 85% by weight of a methyl methacrylate, (B) 15 to 50 by weight of a cyclohexyl methacrylate and (C) 0 to 30% by weight of the other copolymerizable with said monomer (A) and (B), or partially polymerized product thereof.
摘要:
An optical recording medium capable of improving uniformity of thickness of a protective film and suppressing warping. The medium is configured to include a substrate, an optical recording film formed on the substrate, and a light transmitting protective film formed above the optical recording layer, wherein the protective film includes a polymer sheet produced by melt casting and an adhesive layer for bonding the polymer sheet to the optical recording layer. As the polymer sheet, a polycarbonate sheet, a cyclic polyolefin sheet, etc. can be used. As the adhesive layer, an ultraviolet curing resin, a heat curing resin, an epoxy resin-based adhesive agent or a pressure-sensitive tackiness agent may be used alone or mixed or stacked.
摘要:
An optical recording medium capable of improving uniformity of thickness of a protective film and suppressing warping. The medium is configured to comprise a substrate, an optical recording film formed on the substrate, and a light transmitting protective film formed above the optical recording layer, wherein the protective film comprises a polymer sheet produced by melt casting and an adhesive layer for bonding the polymer sheet to the optical recording layer. As the polymer sheet, a polycarbonate sheet, a cyclic polyolefin sheet, etc. can be used. As the adhesive layer, an ultraviolet curing resin, a heat curing resin, an epoxy resin-based adhesive agent or a pressure-sensitive tackiness agent-may be used alone or mixed or stacked.
摘要:
An optical recording medium capable of improving uniformity of thickness of a protective film and suppressing warping. The medium is configured to include a substrate, an optical recording film formed on the substrate, and a light transmitting protective film formed above the optical recording layer, wherein the protective film includes a polymer sheet produced by melt casting and an adhesive layer for bonding the polymer sheet to the optical recording layer. As the polymer sheet, a polycarbonate sheet, a cyclic polyolefin sheet, etc. can be used. As the adhesive layer, an ultraviolet curing resin, a heat curing resin, an epoxy resin-based adhesive agent or a pressure-sensitive tackiness agent may be used alone or mixed or stacked.
摘要:
An optical recording medium capable of improving uniformity of thickness of a protective film and suppressing warping. The medium is configured to comprise a substrate, an optical recording film formed on the substrate, and a light transmitting protective film formed above the optical recording layer, wherein the protective film comprises a polymer sheet produced by melt casting and an adhesive layer for bonding the polymer sheet to the-optical recording layer. As the polymer sheet, a polycarbonate sheet, a cyclic polyolefin sheet, etc. can be used. As the adhesive layer, an ultraviolet curing resin, a heat curing resin, an epoxy resin-based adhesive agent or a pressure-sensitive tackiness agent may be used alone or mixed or stacked.
摘要:
An optical recording medium comprising a transparent substrate of a synthetic resin and an information recording layer provided thereon, on which medium information can be optically written, read and erased by means of a laser light, wherein said transparent substrate consists essentially of a cast-cured product of an epoxy resin composition comprising an alicyclic epoxy resin, or a mixture of a major amount of an alicyclic epoxy resin and a minor amount of an aromatic epoxy resin, an organic polybasic acid anhydride, a curing-accelerator and an anti-discoloring agent.
摘要:
A process for producing a substrate for optical recording medium (optical disk recording medium), which comprises coating at least one inner surface of a casting mold with a radiation-curable or thermosetting resin, curing the resin to form a coating film on the mold surface or surfaces, casting into the mold an epoxy resin composition comprising an alicyclic epoxy resin or a mixture of an alicyclic epoxy resin and an aromatic epoxy resin, an organic polybasic acid anhydride, a curing accelerator and an anti-discoloring (anti-oxidative) agent, curing the epoxy resin composition to transfer the coating film of the mold to the surface of the cured product of the epoxy resin composition, thereby forming a double or triple layer cast laminate. The above casting mold may have a mold-releasing film on the inner surfaces and the coating film may be formed on this mold-releasing film.