Patent application number | Description | Published |
20080230946 | SOLUTION CASTING METHOD - A primary dope containing a polymer, a solvent and an additive is fed to a filtration device in a filtrating unit. The filtration device includes a filter on which a deposit layer of a filtration aid is formed, and impurities in the primary dope are adsorbed to the deposit layer. After the filtration, a residue containing the impurities and the filtration aid on the filter, and the filtration device is filled a cleaning liquid. Then a stirrer in the filtration device is stirred so as to disperse the residue to the cleaning liquid. Thus a slurry liquid is obtained and fed to a separation device. In the separation device, the slurry liquid is fed into a strainer to separate the slurry liquid to the residue and the liquid material. The residue is dried in a drying device and the solvent vapor is recovered. | 09-25-2008 |
20080280072 | CELLULOSE ESTER FILM AND PRODUCTION METHOD THEREOF - A dope containing a retardation controller, cellulose ester, and a solvent is prepared. In a first film producing apparatus, the dope is cast onto a casting drum whose surface is cooled to form a casting film in a gel state. The casting film is peeled off from the casting drum, and the peeled casting film is dried until a residual solvent amount reaches 10 wt. %. Cellulose ester contained in the casting film is crystallized by heating the casting film to a temperature of not less than 170° C. and not more than 250° C., and the casting film is stretched in the width direction. Thus, a film is produced. An absolute value |P1| of a degree of orientation of the polymer in the in-plane direction of the produced film satisfies 0≦|P1|≦0.050. | 11-13-2008 |
20090057943 | SOLUTION CASTING PROCESS AND APPARATUS - In a solution casting apparatus, polymer dope containing cellulose ester and solvent is cast to form cellulose ester film continuously. A filtration device has a precoat of a filter aid deposited on a filter screen, for filtering polymer dope to be cast. A washer washes the filtration device after discontinuing supply of the polymer dope to the filtration device. A filter regenerating device deposits a precoat of the filter aid in the washed filtration device by use of precoat solution containing the filter aid, the polymer dope and solvent. A drain line drains the precoat solution from the filtration device after depositing the precoat. The filtration device is charged with solvent saturated gas upon draining. A valve mechanism changes over plural filtration devices, to manage the filtration device among the filtration devices in the washer, the filter regenerating device and the drain line. | 03-05-2009 |
20090232982 | POROUS FILM PRODUCTION METHOD AND APPARATUS - A coating liquid containing a polymer and a hydrophobic solvent is applied to a support to form a coating film. Water vapor is condensed from ambient air on a surface of the coating film. A hydrophobic solvent is evaporated until a content rate of the solvent in the coating film reaches 50 wt %. The coating film is caused to contact with liquid water. The hydrophobic solvent contained in the coating film is moved from the coating film to the water. The water and the solvent are evaporated from the coating film. Thus, a porous film having a plurality of pores is produced. It is unnecessary to adjust a surface temperature of the coating film and a dew point of the gas around the coating film precisely. It becomes possible to evaporate the hydrophobic solvent contained in the coating film rapidly. | 09-17-2009 |
20090246365 | METHOD FOR PRODUCING POROUS FILM - After a second liquid is applied to a support and dried, a first liquid is applied thereon. On a film of the first liquid, a third liquid (water) is supplied in droplets using an inkjet-type liquid supply unit. An area supplied with the droplets is referred to as porous area. Next, an organic solvent is evaporated from the film and the droplets are evaporated from the porous area. Thus, a porous film is obtained. The porous film has the porous areas in which a plurality of pores are arranged. Since the droplets are directly formed by an inkjet printing method, a condensation process and a droplet growing process are unnecessary. Thus, the porous film is produced efficiently. Shapes of the porous areas can be changed easily. The porous areas can be formed on the porous film in various patterns. | 10-01-2009 |
20090246388 | METHOD FOR PRODUCING POROUS FILM - A second liquid is applied to a support and dried to form a middle layer. Then, a first liquid is applied to the middle layer. A third liquid is applied to a film of the first liquid using an inkjet type liquid supply unit to form a porous area. The first and third liquids differ in interfacial tension against water. Moist air is supplied to the porous area to cause condensation. In a third chamber, the condensation grows into large droplets, and a solvent is evaporated from the film. Thereafter, the droplets are evaporated from the porous area. Thus, a porous film in which a plurality of pores are arranged is produced. Since the porous area is formed by inkjet printing method, size, shape, and conditions of the porous area is easily changed. | 10-01-2009 |
20090246865 | POROUS FILM - A porous film is used as a cell culture substrate that is a scaffold for a spheroid. The porous film has a plurality of pores whose diameters gradually increase in a direction A. The diameters of the pores gradually increase from a first area P | 10-01-2009 |
20100070026 | STENT WITH POROUS MEMBRANE AND MANUFACTURING METHOD THEREOF - A dipping bath contains a polymer solution. Stent body members are dipped into the polymer solution. The polymer solution forms membrane on the surface of the stent body member. Humid atmosphere is created around the stent body members with the membrane to condense water vapor into water droplets on the surface of the membrane. After growing the water droplets to water drops, a solvent is evaporated, and the water drops penetrate into the membrane. Then, the water drops are evaporated with leaving pores in the membrane. The water drops function as templates. | 03-18-2010 |
20100080917 | POROUS MATERIAL PRODUCTION METHOD - A solution containing a polymer and a solvent is discharged onto a surface of a polymer film to form a coating film. When a thickness of the coating film is a critical thickness or less, dewetting of the solution occurs on the surface, and the coating film becomes a dewetting material having dewetting pores. Wet air is blown to a surface of the dewetting material. The solvent is evaporated from the dewetting material. Water vapor is condensed from ambient air on the surface of the dewetting material to generate water drops. Dry air is blown to the surface of the dewetting material. The solvent and the water drops are evaporated from the dewetting material. Thereby, it is possible to produce a porous material whose surface includes first pores as the dewetting pores formed by the dewetting of the solution and the second pores formed by the water drops as a template for the porous material. | 04-01-2010 |