Abstract: A film stretched uniaxially in the transverse direction selectively is obtained by preventing a phenomenon that the film is stretched also in the longitudinal direction in stretching the film in a direction transverse to the conveying direction. A film F is stretched in the transverse direction while being gripped with clips 2 each having a corrugated upper teeth part (holding member piece) 12 and a corrugated lower teeth part (holding member piece) 11. Furthermore, the film F is shaped into a wavy form using corrugated gripping members 6a and 6b and stretched in the transverse direction while being held with the clips 2 having the holding members.

Abstract: It is an object of the present invention to provide a method for manufacturing a multilayer polyimide film, uniform in film thickness and rate of dimensional change in the width direction of the film, which has a thermoplastic polyimide layer or the like serving as an adhesive layer. The object is attained by a method for manufacturing a multilayer polyimide film by width-spreading and flow-casting at least two types of polyimide resin solutions or polyimide precursor resin solutions fed into a multilayer coextrusion die including a plurality of flow channels, the method being characterized in that the thickness of each layer of the multilayer film is controlled by adding a solvent to the resin solutions to be fed into at least one of the flow channels and by adjusting, independently of the amounts of the resin solutions to be fed, the amount of the solvent to be added.

Abstract: It is an object to provide a method for producing a retardation film and the like, the retardation film contributing to cost reduction and enlargement of the screen of liquid crystal display devices having a high level of visibility. There is provided a method for producing a retardation film, the method including conveying a long polymer film being continuously fed in a conveying direction while holding both side edges of the polymer film and stretching the polymer film in a direction transverse to the conveying direction while conveying the polymer film, wherein the retardation film has an optical axis in the direction transverse to the conveying direction of the polymer film and has optical properties satisfying 0.1?NZ?0.9, and wherein the polymer film is stretched in the transverse direction with sagged in the conveying direction.

Abstract: A film stretched uniaxially in the transverse direction selectively is obtained by preventing a phenomenon that the film is stretched also in the longitudinal direction in stretching the film in a direction transverse to the conveying direction. A film F is stretched in the transverse direction while being gripped with clips 2 each having a corrugated upper teeth part (holding member piece) 12 and a corrugated lower teeth part (holding member piece) 11. Furthermore, the film F is shaped into a wavy form using corrugated gripping members 6a and 6b and stretched in the transverse direction while being held with the clips 2 having the holding members.

Abstract: It is an object of the present invention to provide a method for manufacturing a multilayer polyimide film, uniform in film thickness and rate of dimensional change in the width direction of the film, which has a thermoplastic polyimide layer or the like serving as an adhesive layer. The object is attained by a method for manufacturing a multilayer polyimide film by width-spreading and flow-casting at least two types of polyimide resin solutions or polyimide precursor resin solutions fed into a multilayer coextrusion die including a plurality of flow channels, the method being characterized in that the thickness of each layer of the multilayer film is controlled by adding a solvent to the resin solutions to be fed into at least one of the flow channels and by adjusting, independently of the amounts of the resin solutions to be fed, the amount of the solvent to be added.

Abstract: An adhesive film, having lubricity, which can be favorably used as an FPC board even when a dense circuit pattern is formed is provided. The adhesive film is obtained by providing a highly heat-resistant polyimide layer and thermoplastic polyimide layers on both surfaces of the highly heat-resistant polyimide layer. The highly heat-resistant polyimide layer, serving as a central layer, has substantially no lubricant existing therein. Each of the thermoplastic polyimide layers has a lubricant, uniformly dispersed in the thermoplastic polyimide layer, which has a median average particle diameter of 1 ?m to 10 ?m. The lubricant existing in the thermoplastic polyimide layer is covered with a thermoplastic polyimide resin.

Abstract: An object of the present invention is to provide a polyimide multilayer adhesive film in which the thicknesses of the respective layers can be precisely measured by an infrared absorption method and a method for producing the same. In an adhesive film including a highly heat-resistant polyimide layer and an adhesive layer that contains a thermoplastic polyimide and that is disposed on at least one surface of the highly heat-resistant polyimide layer, the adhesive film is produced by a coextrusion-flow casting method and either of the highly heat-resistant polyimide layer or the adhesive layer contains, as a principal component, a polyimide resin having a functional group showing a characteristic infrared absorption wavelength.

Abstract: The present invention produces chlorinated vinyl chloride resin from which hydrogen chloride can easily be removed and having little coloring as a molded article. Also, chlorinated vinyl chloride resin from which hydrogen chloride can easily be removed and excellent in heat resistance and thermal stability can be produced using a process for preparing chlorinated vinyl chloride resin by gas-solid contact chlorination which is excellent in simplicity of after treatment and facility costs. Chlorination is conducted rapidly and evenly by exposing vinyl chloride resin powder in a fluidized state with light from a light source located outside the powder layer, while supplying chlorine to the powder layer, by using devices such as a rotary reactor or stirring type reactor.

Abstract: To treat waste containing harmful metals such as lead, cadmium, mercury, chromium, copper, nickel, zinc, etc., the waste is mixed with a treating agent containing, as the essential constituent component, solid acid(s) and/or cement and additionally a caking inhibitor, kneaded with water where necessary, then solidified by curing. Harmful metals are thereby stabilized in the thus-solidified cakes and are not released therefrom.

Abstract: To treat waste containing harmful netals such as lead, cadmium, mercury, chromium, copper, nickel, zinc, etc., the waste is mixed with a treating agent containing, as the essential constituent component, solid acid(s) and/or cement and additionally a caking inhibitor, kneaded with water where necessary, then solidified by curing. Harmful metals are thereby stabilized in the thus-solidified cakes and are not released therefrom.