Abstract: This invention provides a directly imageable planographic printing plate precursor with excellent image reproducibility without requiring any complicated process after irradiation with a laser beam. To solve the above problem, this invention is constituted as describe below. A directly imageable waterless planographic printing plate precursor, in which at least an ink acceptable layer and a silcone rubber layer are laminated in this order on a substrate, wherein when the printing plate precursor is measured by TG-GC/MS in a hellium current at a heating rate of 10° C./min, a decomposition product is generated in a temperature range of 100° C. to 200° C. by 0.001 g/m2 to 1 g/m2 per plate area.

Abstract: Phase-change type rewritable optical recording media, such as optical discs, optical cards, and optical tapes, where recorded data can be erased or overwritten and where data can be recorded with high speed and high density by applying a light beam can include an optical recording medium is one that includes a laminate member, which in various embodiments contains a transparent substrate, a first dielectric layer, a recording layer, a second dielectric layer, a light absorbing layer, and/or a reflecting layer. In various embodiments of the invention, the shortest distance between recorded marks in the recording direction along the track is less than &lgr;/NA, with &lgr; and NA denoting the wavelength of the light used and the numerical aperture of the objective lens of the optical head, respectively.

Abstract: A directly imageable waterless planographic printing plate, which has at least the heat sensitive layer and an ink repellent layer in this order on a substrate, having a high sensitivity and good image reproducibility and allowing a heat sensitive layer to remain even after development is produced by imagewisely irradiating a precursor of the printing plate with a laser beam, pre-treating the precursor by a pre-treatment liquid containing an amine compound by 0.1 to 30 wt % based on the weight of the entire pre-treatment liquid, and removing the ink repellent layer at the laser beam irradiated area, in this order, such that the heat sensitive layer is at least partially left on the printing plate after completion of the above steps.

Abstract: An optical recording medium having each of a land and a groove and comprises at least a recording layer, dielectric layers and reflection layer. Recording and erasing of data can be carried out on both land and groove by a phase change between amorphous and crystalline states. The mirror portion may have reflectance characteristics selected from at least one of a reflectance of more than 15% and no more than 35%, when in a crystalline state, and 10% or less, when in an amorphous state. Alternatively, additionally, the depth of the groove may be such as to form an optical path length equal to 1/7 to 1/5 of the wavelength of the reproducing light and the photo-absorbance of the recording layer in the amorphous phase and the photo-absorbance in the crystalline phase may satisfy the following formula, Aa-Ac.ltoreq.10 where Aa is the photo-absorbance (%) of the recording layer in the amorphous phase and Ac is the photo-absorbance (%) of the recording layer in the crystalline phase.

Abstract: An optical recording medium having each of a land and a groove and comprises at least a recording layer, dielectric layers and reflection layer. Recording and erasing of data can be carried out on both land and groove by a phase change between amorphous and crystalline states. The mirror portion may have reflectance characteristics selected from at least one of a reflectance of more than 15% and no more than 35%, when in a crystalline state, and 10% or less, when in an amorphous state. Alternatively, additionally, the depth of the groove may be such as form an optical path length equal to 1/7 to 1/5 of the wavelength of the reproducing light and the photo-absorbance of the recording layer in the amorphous phase and the photo-absorbance in the crystalline phase may satisfy the following formula,Aa-Ac.ltoreq.10where Aa is the photo-absorbance (%) of the recording layer in the amorphous phase and Ac is the photo-absorbance (%) of the recording layer in the crystalline phase.

Abstract: An optical recording medium, wherein a recording layer is formed on a substrate to which a light beam is applied to record, erase, and read data with said recording and erasing of data being carried out by means of phase changes between amorphous and crystalline, and which recording medium has a laminated structure made up of a transparent substrate on which at least a first dielectric layer, recording layer, second dielectric layer, and reflecting layer are formed in this order; and the second dielectric layer not being transparent.Said optical recording media permit low-power recording and erasing, remain stable after repeated recording and erasing, and hardly suffer deterioration in performance or formation of defects. They are high in resistance to moist heat and oxidation and long in service life.

Abstract: An optical recording medium comprising a substrate and, provided thereon, a recording layer and a dielectric layer, wherein the dielectric layer comprises a dielectric comprised of a chalcogenide and carbon (C).

Abstract: An optical recording medium including a recording layer of a tellurium alloy comprising at least a metal M, antimony Sb and germanium Ge added to tellurium and having the following composition formula:M.sub.z (Sb.sub.x Te.sub.l-x).sub.l-y-z (Ge.sub.0.5 Te.sub.0.5).sub.y0.35.ltoreq.x.ltoreq.0.70.2.ltoreq.y.ltoreq.0.50.0001.ltoreq.z<0.05wherein the metal M is one kind of metal selected from the group consisting of niobium Nb and platinum Pt; and the subscripts x, y, l-x and l-y-z the numbers of atoms of elements (molar number of elements).

Abstract: An optical recording medium includes at least a substrate and a recording layer formed on the substrate, said recording layer being irradiated with an energy beam to change the optical properties thereof by directly or indirectly generated heat, thereby recording information, wherein said recording layer comprises four elements of tellurium (Te), germanium (Ge), gallium (Ga) and bismuth (Bi) and has a composition represented by the following formula:(Te.sub.x Ge.sub.1-x).sub.1-y (Ga.sub.z Bi.sub.1-z).sub.ywherein0.40.ltoreq.x.ltoreq.0.750.02.ltoreq.y.ltoreq.0.30 and0.05.ltoreq.z.ltoreq.0.50,x is the molar fraction of Te in Te-Ge, y is the molar fraction of the total amount of Bi and Ga in the recording layer, and z is the molar fraction of Ga in Ga-Bi.

Abstract: An optical recording medium includes a substrate, a recording layer and a dielectric layer formed on said substrate, said dielectric layer containing a mixture containing at least a chalcogen compound and fluoride compound. The optical recording medium has excellent long term storage stability, excellent recording and erasing cycle characteristics and excellent recording and/or erasing characteristics.

Abstract: In an optical recording medium of the type on which information can be written, erased, and read by irradiating light to a recording layer formed on a substrate and in which writing and erasing of the information are effected by phase transition between an amorphous phase and a crystalline phase, this invention relates to an optical recording medium which includes at least a recording layer and protective layers and the composition of the recording layer comprises at least one kind of metals selected from the group consisting of palladium (Pd), nickel (Ni), silver (Ag), and gold (Au); antimony (Sb); germanium (Ge); and tellurium (Te), and is expressed by the formula given below. The present invention provides an optical recording medium which has a high erasing speed, is excellent in recording characteristics such as a carrier-to-noise ratio, an erase ratio, recording sensitivity, etc.

Abstract: A radiation-sensitive composition is described, which is comprised of (1) a polymer containing repeating units of the formula: ##STR1## wherein R.sup.1 is a trivalent or tetravalent aromatic or heteroaromatic residue having 6 to 30 carbon atoms, R.sup.2 is a divalent aromatic or heteroaromatic residue having 6 to 30 carbon atoms, R.sup.3 is hydrogen or an ammonium ion, n is 1 or 2, and COOR.sup.3 is located in an ortho or peri position with respect to the amide linkage, (2) an organic compound having a radiation-dimerizable or radiation-polymerizable olefinic double bond and an amino radical or a quaternary ammonium salt, and (3) an aromatic monoazide compound [III] having no substituent or having a neutral or acidic substituent. This composition has a highly improved radiation sensitivity and the sensitive wavelength region of this composition is very broad. This composition can give a highly heat-resistant relief pattern with a good edge sharpness.

Abstract: A radiation-sensitive composition is described, which is comprised of (1) a polymer containing repeating units of the formula: ##STR1## wherein R.sup.1 is a trivalent or tetravalent aromatic or heteroaromatic residue having 6 to 30 carbon atoms, R.sup.2 is a divalent aromatic or heteroaromatic residue having 6 to 30 carbon atoms, R.sup.3 is hydrogen or an ammonium ion, n is 1 or 2, and COOR.sup.3 is located in an ortho or peri position with respect to the amide linkage, (2) an organic compound having a radiation-dimerizable or radiation-polymerizable olefinic double bond and an amino radical or a quaternary ammonium salt, and (3) an aromatic secondary or tertiary amine compound which is chemically inactive to actinic radiation. This composition has an improved photo-sensitivity or radiation sensitivity and can give highly heat-resistant relief patterns with a good edge sharpness and good mechanical and chemical properties as well as good insulating properties.

Abstract: The present invention relates to a novel photosensitive composition. In particular, the present invention relates to a photosensitive resin composition suitable for use as a photoresist.