Abstract: It is to provide an optical recording medium suitable for information recording at a high speed.

Abstract: The present invention relates to a printable optical recording medium comprising: a transparent substrate; and at least a recording layer, a reflective layer and a protective layer, a reflective layer or a protective layer and an ink-receiving layer, which layers are in order superposed on said transparent substrate;said protective layer or said ink-receiving layer:(a) containing a hydrophilic and water-insoluble filler having a Mohs hardness of not more than 3;(b) having an arithmetic mean surface roughness Ra on the surface thereof of 0.3 to 2.0 .mu.m; and(c) having a "b" value of the surface thereof of +5 to -5 in Lab color space as a chromaticity.Such printable optical recording medium has a good surface printability and a high whiteness on a printing surface thereof, and is a high chroma of images printed thereon.

Abstract: A polyester resin film which is biaxially oriented and again oriented in a machine direction and a coating layer formed on at least one surface of the film, in which the coating layer contains at least 50% by weight of a water-soluble or water-dispersible polyester resin having a glass transition temperature of at least 20.degree. C., which film has a good adhesion property.

Abstract: Disclosed herein is a magnetic recording medium comprising:a stretched polyethylene-2,6-naphthalate multilayered film having a high-roughness surface and a low-roughness surface;a coating layer (A) having specific surface properties and being formed on the high-roughness surface of said multilayered film;a coating layer (B) having a specific surface property and being formed on the low-roughness surface of said multilayered film; anda thin ferromagnetic metal film formed on said coating layer (B).

Abstract: Disclosed herein is a polyester film containing specific fine spherical silica particles. The film of the present invention is especially suitable as a base film for a magnetic recording medium or dielectric for a capacitor. The films of the present invention have the markedly improved properties such as surface properties, electromagnetic properties, electrical properties, etc. due to the excellent dispersibility of the particles in the film.

Abstract: Disclosed in this invention is a polyester film for magnetic recording media, containing 0.05 to 5% by weight of inactive inorganic particles (A) having a Mohs hardness of 6 or above and an average particle size of 0.005 to 1.0 .mu.m and 0.01 to 2.0% by weight of inactive particles (B) having an average particle size which is greater than that of the particles (A) and in the range of 0.1 to 3.0 .mu.m, the polyester film having an intrinsic viscosity in the range of 0.52 to 0.65. The polyester film of this invention is excellent in abrasion resistance, scuff resistance and slitting qualities and useful as a base film for magnetic recording media.

Abstract: Disclosed herein is a polyester film containing specific fine spherical silica particles. The film of the present invention is especially suitable as a base film for a magnetic recording medium or dielectric for a capacitor. The films of the present invention have the markedly improved properties such as surface properties, electromagnetic properties, electrical properties, etc. due to the excellent dispersibliity of the particles in the film.

Abstract: Disclosed herein is a biaxially oriented polyester film for magnetic recording media, containing uniformly carbon black particles and having the following specific properties: ##EQU1## wherein T.sub.900 represents a light transmittance of the film at a wavelength of 900 nm, Ra represents an average surface roughness of the film n.sub.1 represents the number of protuberances of 0.81 to 1.08 .mu.m in height existing on the surface of the film per film area of 25 cm.sup.2, and n.sub.2 represents the number of protuberances of more than 1.08 .mu.m in height existing on the surface of the film per film area of 25 cm.sup.2.