Abstract: Optical recording media disclosed herein are excellent in recording sensitivity as well as in the adhesion of the substrate to the recording layer, said substrate consisting of a random copolymer of ethylene and a cycloolefin and having a specific structure.

Abstract: An optical recording medium of a metal-containing indoaniline compound having the formula: ##STR1## wherein M is a metal atom selected from the group consisting of Ni, Cu or Co, R.sup.1 is a hydrogen atom, a halogen atom or a methyl group, n is 1 or 2, X is a hydrogen atom or a lower alkyl group, each of R.sup.2 and R.sup.3 is a lower alkyl group, and Z.sup.- is an anion, as a dye on a substrate.

Abstract: A recording material employing at least one leuco dye having formula (I), which is colored when brought into contact with a color developer capable of inducing color formation in the leuco dye: ##STR1## wherein R.sup.1 and R.sup.2 each represent an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group, an unsubstituted or substituted aralkyl group, or an unsubstituted or substituted aryl group, which R.sup.1 and R.sup.2 may form a ring in combination or a morpholine ring through an oxygen atom; R.sup.3 represents hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms or an aralkyloxy group; R.sup.4 and R.sup.5 each represent an alkyl group having 1 to 4 carbon atoms; and R.sup.6 represents hydrogen, an alkyl group having 1 to 4 carbon atoms or a halogen.

Abstract: An information storage medium comprises a substrate and a recording layer formed on the substrate containing Te, Ge, C and H. The recording layer is formed by sputtering, with a Ge-Te alloy being used as a target and with a mixed gas of a noble gas and a hydrocarbon being used as a sputtering gas. The hydrocarbon content in the sputtering gas falls within a range of 3 to 35%. The composition of the target is Ge.sub.x Te.sub.100-x (where x is expressed by atomic %, and 5.ltoreq.x.ltoreq.20).

Abstract: An optical data storage medium comprises a substrate layer, a recording medium and an optional protective layer. The substrate layer supports the recording medium. The recording medium comprises a polymer having stable amorphous and crystalline states under human operating conditions which states have different optical properties. The recording medium is optionally covered and protected by a protective layer. The substrate, recording medium and protective layer can be formed from the same or different polymers. The data is stored by exposing the recording medium to patterned infra-red radiation. The radiation can be patterned by a mask, movement of the radiation beam or by other means to imprint the data on the recording medium.

Abstract: Light-sensitive silver halide photographic materials comprising a support base and one or more hydrophilic colloid layers, at least one of which is a silver halide emulsion layer, at least one hydrophilic colloid surface layer of said photographic materials containing (a) a non-ionic surface active agent having a polyoxyethylene group, (b) a fluorinated organic compound which is the reaction product of a polyoxyalkyleneamine compound and a fluorinated organic acid compound, (c) discrete particles of a water-insoluble matting agent and (d) discrete particles of a water-insoluble surface modifying agent selected in the group of a silicone polymer and colloidal silica.

Abstract: A polymeric tetra-aryl polymethine dye of the general formula ##STR1## in which: A comprises a conjugated chain of carbon atoms having an equal number of double and single bonds,each R independently represents an alkyl group of 1 to 4 carbon atomsR.sup.1 represents --NR.sub.2 or ##STR2## and X.sup.- represents an anion.The dyes are suitable for use as recording media in optical recording elements in which information may be recorded and read directly afterwards by means of laser light.