Abstract: The biaxially oriented, white polyester film of the present invention having improved flame-retardancy, covering ability, flexibility and heat-resistance comprises a polyester resin having an intrinsic viscosity of 0.4 to 0.9 dl/g, a flame-retardant which is alkylene bistetrabromophthalimide or decabromodiphenylalkane, and a fluorescent whitening agent, said polyester film being biaxially drawn at a total draw ratio of 9 or more.

Abstract: A heat-shrinkable polyester film comprising a polyester base film and a coat layer formed on one or both sides of the polyester base film, said coat layer comprising a copolymerised polyester having carboxyl group terminals and Tg in the range of 70 to 80;É, exhibits superior properties suitable for labeling or shrink-wrapping containers.

Abstract: The biaxially oriented polyester film of the present invention useful for twist wrapping is prepared by biaxially drawing a polyester sheet which has a glass transition temperature (Tg) of at least 60° C., in the longitudinal and transverse directions, wherein the biaxially oriented film has a specific gravity of 1.38 or less.

Abstract: Disclosed in this invention is a heat-shrinkable polyester film comprising a polyester film support and a coat layer formed on one or both sides of the polyester film support, said coat layer comprising a quaternary ammonium sulfate and a polysiloxane resin.

Abstract: The lithium ion polymer battery having high capacity, capacity retention and cycling life is prepared by gelating a gel polymer electrolyte composition comprising an organic solvent, a lithium salt, and a gelling agent composed of a nitrogen-containing polymer and an epoxy group-containing polymer at room temperature according to the present invention free from heating step at a low cost.

Abstract: A silicone coating composition comprising an alkylvinylpolysiloxane, an alkylhydrogenpolysiloxane, a platinum complex catalyst and a water-soluble polyester resin is advantageously used for the preparation of a polyester release film having good release property and improved rub-off resistance.

Abstract: A phase change optical disk having excellent corrosion resistance, recording signal properties and overwrite cyclability, which contains a first dielectric layer, a recording layer, a second dielectric layer, a reflection layer and a protection layer, characterized in that the reflection layer comprises a first reflection layer made of a metal or an alloy thereof having an electronegativity ranging from 1.9 to 3.0 and a second reflection layer made of Cu, Ag or an alloy thereof, said first reflection layer being in closed contact with the second dielectric layer, and the second reflection layer, with the first reflection layer and the protection layer.

Abstract: A triple substrate optical disk comprises a center substrate layer, a top substrate layer, a bottom substrate layer, a top adhesion layer bonding the top substrate layer to the center substrate layer and a bottom adhesion layer bonding the center substrate layer to the bottom substrate layer. The center substrate layer has a center substrate containing a top surface and a bottom surface thereof, a first recording layer deposited on the top surface of the center substrate and a second recording layer deposited on the bottom surface of the center substrate. The top substrate layer includes a top substrate and a third recording layer, wherein the top substrate has a top surface and a bottom surface thereof and the third recording layer is deposited on the bottom surface of the top substrate.

Abstract: A biaxially extended polyester film which comprises a polyester resin having ethylene A biaxially oriented polyester film comprises a polyester resin having ethylene terephthalate and ethylene isophthalate repeating units in a weight ratio of 90:10 to 75:25; 0.02 to 0.06 weight % of an organic phosphite or phosphate ester; and 0.01 to 0.05 weight % of a hindered phenol compound, wherein the film possesses good thermal stability, processability, and thermal adhesive strength to a metal surface and is useful in forming the inner laminate layer of a metal container.

Abstract: A copolyester resin having excellent physical properties and a low acetaldehyde content is produced by: polycondensing a mixture of terephthalic acid and isophthalic acid with a glycol in the presence of a phosphate compound to prepare a copolyester prepolymer having an intrinsic viscosity of more than 0.5 dl/g; subjecting the copolyester prepolymer to a first heat-treatment to obtain a pre-crystallized resin; and subjecting the pre-crystallized resin to a second heat-treatment, to obtain a copolyester resin having an intrinsic viscosity of 0.62 to 0.80 dl/g and a melting point of 190.degree. to 240.degree. C.

Abstract: A biaxially oriented polyester film consisting essentially of a polyester resin, polytetrafluoroethylene resin particles having an average particle diameter of 3 to 8 .mu.m in an amount ranging from 0.3 to 0.6% by weight based on the weight of the polyester resin, and a polyacrylate dispersant in the amount 0.05 to 5 wt % based on the weight of polytetrafluoroethylene particles. The film possesses excellent surface properties, e.g., abrasion resistance, scratch resistance, transparency, void resistance, surface smoothness, slurry stability, running property and dielectric strength.

Abstract: A magneto-optic characteristic measuring device which is adapted to measure a Kerr rotation angle is a kind of magneto-optic characteristic exhibited in materials used for magneto-optic recording media. Known materials exhibiting a magnetic Kerr effect have very small Kerr rotation angle ranging from about 0.1.degree. to about 0.5.degree.. As a result, it is difficult to accurately measure such a small Kerr rotation angle using known measuring devices due to an influence caused by noise components. In the magneto-optic characteristic measuring apparatus, its electronic circuit unit, which serves to magneto-optically modulate a laser beam from an optical unit introduced in a beam splitter via a polarizer and to record the modulated beam in an X-Y recorder using a detect signal from an optical detector unit, includes a lock-in amplifier,.thereby accurately measuring a small Kerr rotation angle.

Abstract: A biaxially extended polyester film comprising light calcium carbonate particles, spherical silica particles and .gamma.- or .delta.-alumina particles or a mixture thereof treated with a silane coupling agent prepared by the inventive process possesses excellent surface and physical properties.

Abstract: A biaxially oriented polyester film comprises: 0.01 to 4 wt % of .gamma., .delta.- .theta.-alumina or a mixture thereof having an average particle diameter ranging from 0.005 to 3 .mu.m and a Mohs hardness of 6 or more; 0.05 to 5 wt %, based on the amount of the alumina employed, of a silane coupling agent of the following formula (I); and, optionally, 0.01 to 4 wt % of spherical silica particle having an average particle diameter ranging from 0.005 to 3 .mu.m:R.sub.1 --R.sub.2 --Si--(OR.sub.3).sub.3 (I)wherein,R.sub.1 is a methacryl, an acryl, a glycidyl or an amino group;R.sub.2 is a C.sub.1-5 alkylene group; andR.sub.3 is a C.sub.1-3 alkyl group.The film has improved transparency as well as surface properties, and is especially useful as labels, window coating films, photoresists and the like.

Abstract: A polyester base film for magnetic recording media having improved adhesion to the magnetic layer applied thereon as well as good abrasion and scratch resistance prepared by melt-extruding a polyester resin containing inorganic and organic particles to form a sheet; extending the sheet; and heat-setting the extended film, wherein the heat-setting step is carried out by heat-treating a first surface of the film, which is to be coated with a magnetic material, at a temperature ranging from 170.degree. to 290.degree. C. for 1 to 50 seconds so that the crystallinity thereof ranges from 50 to 70% and heat-treating the other surface of the film at a temperatue which is lower than the first heat-treatment temperature by 20.degree. C. or more for 1 to 200 seconds so that the other surface attains a crystallinity which is lower than that of the first surface by at least 5%.

Abstract: Apparatus for preparing a polyester resin by polymerizing a monomer produced by transesterifying a dicarboxylic acid component with a diol component while removing the vapor containing diols and other low molecular weight compound released during the polymerization, which comprises:a polymerization reactor;a condenser having an inlet, a heat exchanger and an outlet, the inlet being located below the heat exchanger and connected to the polymerization reactor while the outlet being positioned above the heat exchanger;a baffle installed between the inlet and the heat exchanger of the condenser such that the flow of the vapor is directed toward the bottom of the condenser;a trap located below the condenser to collect the condensate of the vapor; anda vacuum pump connected to the outlet of the condenser.

Abstract: A method for forming a replica stamper for use in mass producing an optical disk, wherein the optical disk has a plurality of tracks arranged spirally or concentrically, and each of the tracks includes a recess and a protrusion for recording information signals thereon, comprises the steps of: (a) preparing a master stamper having a top surface and a flat bottom surface, wherein the top surface of the master stamper includes a plurality of tracks corresponding to the plurality of tracks of the optical disk; (b) depositing a buffer layer on the top surface of the master stamper; (c) forming a replica stamper on top of the buffer layer; (d) disengaging the master stamper from the buffer layer and the replica stamper; and (e) removing the buffer layer from the replica stamper.

Abstract: A process for preparing a thermoplastic resin film having uniform physical and chemical properties includes extending a thermoplastic resin sheet in a longitudinal direction so that the crystallization energy of the longitudinally extended sheet is 20 J/g or more to give a longitudinally extended sheet, extending the longitudinally extended sheet in a transverse direction to give a biaxially extended film, and heat treating the biaxially extended film to give the resin film.