Abstract: In an optical recording medium comprising a substrate including parallel extending lands and grooves on one surface thereof, the grooves serving as recording tracks, and the lands being formed with prepits, the height HP of the land disposed between the prepit and the groove divided by the height HL of the land in a prepit-free region, both as measured from the groove bottom, i.e., HP/HL ranges from 0.25 to less than 1. This enables to significantly increase the recording density of the medium without a substantial cost increase.

Abstract: A method for producing a photoresist master adapted for use in the manufacture of an optical information medium is provided. This method has enabled formation of a fine pattern having a minimum width which is about half of the wavelength used for the exposure, and in this method, decrease in the pattern height has been suppressed and tapering of the pattern profile has been improved. In this method comprising the steps of applying a photoresist layer on a substrate, exposing the photoresist layer to a laser beam to form a latent image in the photoresist layer, and developing the latent image to form a protrusion/depression pattern to thereby produce the photoresist master, and in this method; a light absorbing layer is formed between the substrate and the photoresist layer and in contact with the photoresist layer, and the light absorbing layer exhibits light absorption at the wavelength of said laser beam.

Abstract: A stamper for forming a data recording region on a recording medium substrate by means of a transfer surface thereof. The transfer surface transfers a predetermined set of data to the recording medium substrate. The stamper is fitted on at least one of metal molds that are arranged opposite one another for forming the recording medium substrate. The stamper includes a stepped portion formed as bends in the material of the stamper. The stepped portion is configured to project from the transfer surface toward the recording medium substrate.

Abstract: An object of the present invention is to provide an easily-peelable film which has the better easy peelability required for a lid member for a container comprising a polyester resin and in which a sealing layer does not cause stringing upon peeling. There is provided an easily-peelable film having a sealing layer of the thickness of 1 to 20 &mgr;m comprising a polyester resin, and a layer adjacent to the sealing layer and comprising at least one kind of ethylene copolymer selected from the group consisting of an ethylene/unsaturated carboxylic ester copolymer and an ethylene vinyl acetate copolymer.

Abstract: A container for a sparkling beverage which comprises, on its inside bottom portion or surface, the bubble generating means having a bubble generating portion for generating bubbles in such a manner that an aggregation of bubbles forms substantially the same shape as the mark on the surface of a beverage.

Abstract: The present invention provides a covering material having a layer formed of a resin of which glass transition point is in the range of 10° C. to 50° C., said covering material having excellent shape keeping ability and shape recovering ability after deformation.

Abstract: An optical disk master having a protrusion/depression pattern on its surface is prepared by applying a photoresist layer on a substrate, exposing the photoresist layer to radiation to form a latent image of the protrusion/depression pattern, and developing the latent image. The step of treating the photoresist layer with a surfactant is included prior to the exposing step or between the exposing and developing steps. An optical disk master having a finer pattern can be prepared at a low cost while minimizing any additional burden on the manufacturing system.

Abstract: In an optical recording medium comprising a substrate including parallel extending lands and grooves on one surface thereof, the grooves serving as recording tracks, and the lands being formed with prepits, the height HP of the land disposed between the prepit and the groove divided by the height HL of the land in a prepit-free region, both as measured from the groove bottom, i.e., HP/HL ranges from 0.25 to less than 1. This enables to significantly increase the recording density of the medium without a substantial cost increase.

Abstract: There are provided; a laminated film or sheet formed by adhesively integrating a resin layer (1) of an acrylic resin with a resin composition layer (2) of a polyolefin resin composition, the polyolefin resin composition comprising an ethylene based copolymer (a) prepared by polymerizing ethylene with at least one compound selected from the group consisting of unsaturated carboxylic acids, unsaturated carboxylic esters, unsaturated carboxylic anhydrides and vinyl acetate, a polyethylene resin (b) excluding the copolymer (a), and a polypropylene resin (c), which is characterized in that the layers (1) and (2) are adhesively integrated with each other to the satisfaction, even if no layer of an adhesive agent is interposed between them; and a laminated structure formed by adhesively integrating the laminated film or sheet with a substrate of a polyolefin resin, which is particularly suitable for uses such as interior or exterior car parts, electric appliances, parts of miscellaneous goods and signboards.

Abstract: The present invention provides a film comprising a layer formed of a resin composition including (a) an olefine-based resin having a solubility parameter (SP value) of from 8.45 to 8.70 and containing therein no repeat unit derived from an aromatic vinyl compound [component (A)] and (b) a thermoplastic resin having a glass transition temperature of more than 50° C. and being made up of a repeat unit different than that of component (A) [component (B)] wherein the resin composition contains from 10 to 1800 parts by weight of component (A) based on 100 parts by weight of component (B), and the like, said film showing an improved easy-tearability, especially better linear tearability.

Abstract: A process for producing an extrusion laminated film or sheet comprising a plastic substrate and a resin for extrusion laminating selected from the group consisting of polyethylene resins, polypropylene resins, ethylene-vinylester copolymer resins and ethylene-(metha)acrylate copolymer resins, comprising (A) a surface oxidizing step, (B) an ozone-treating step and (C) a pressurized laminating step as specified using no chemical primer.