A porous ultra-thin polymer film has a film thickness of 10 nm-1000 nm. A method of producing the porous ultra-thin polymer film includes dissolving two types of mutually-immiscible polymers in a first solvent in an arbitrary proportion to obtain a solution; applying the solution onto a substrate and then removing the first solvent from the solution applied onto the substrate to obtain a phase-separated ultra-thin polymer film that has been phase-separated into a sea-island structure; and immersing the ultra-thin polymer film in a second solvent which is a good solvent for the polymer of the island parts but a poor solvent for a polymer other than the island parts to remove the island parts, thereby obtaining a porous ultra-thin polymer film.

The present invention relates to a synthetic leather for a steering wheel cover of a vehicle, and a method for preparing the same. The synthetic leather including a fiber base layer (101) including a microfiber nonwoven fabric, an urethane porous layer (102) formed on the fiber base layer, a polyurethane resin skin layer (104) formed on the urethane porous layer, and prepared by polymerizing an isocyanate compound and a polyol compound including polycarbonate-based polyol, fluorine-based polyol and ester-based polyol, and an adhesive layer (103) for adhering the urethane porous layer and the skin layer.

The present invention relates to a synthetic leather for a steering wheel cover of a vehicle, and a method for preparing the same. The synthetic leather including a fiber base layer (101) including a microfiber nonwoven fabric, an urethane porous layer (102) formed on the fiber base layer, a polyurethane resin skin layer (104) formed on the urethane porous layer, and prepared by polymerizing an isocyanate compound and a polyol compound including polycarbonate-based polyol, fluorine-based polyol and ester-based polyol, and an adhesive layer (103) for adhering the urethane porous layer and the skin layer.

The invention relates to the film products and methods of their preparation that demonstrate a non-self-aggregating uniform heterogeneity. Desirably, the films disintegrate in water and may be formed by a controlled drying process, or other process that maintains the required uniformity of the film. The films contain a polymer component, which includes polyethylene oxide optionally blended with hydrophilic cellulosic polymers. Desirably, the films also contain a pharmaceutical and/or cosmetic active agent with no more than a 10% variance of the active agent pharmaceutical and/or cosmetic active agent per unit area of the film.

The invention relates to the film products and methods of their preparation that demonstrate a non-self-aggregating uniform heterogeneity. Desirably, the films disintegrate in water and may be formed by a controlled drying process, or other process that maintains the required uniformity of the film. The films contain a polymer component, which includes polyethylene oxide optionally blended with hydrophilic cellulosic polymers. Desirably, the films also contain a pharmaceutical and/or cosmetic active agent with no more than a 10% variance of the active agent pharmaceutical and/or cosmetic active agent per unit area of the film.

We disclose methods for, devices that implement, and structures produced by 3D printing of insulating and airtight walls using fused deposition modeling printers. Several disclosed methods and features contribute to insulating and airtight walls. These can be used individually or in combination. Structures that reduce or eliminate horizontal surfaces through the use of overlying cantilevered contours can be combined with continuous structures that penetrate through multiple layers, selective overfilling, offset joints and additional extrusions to mitigate leakage routes. Self-supporting closed cell structures can be built that form insulating regions by controlling convective losses.

We disclose methods for, devices that implement, and structures produced by 3D printing of insulating and airtight walls using fused deposition modeling printers. Several disclosed methods and features contribute to insulating and airtight walls. These can be used individually or in combination. Structures that reduce or eliminate horizontal surfaces through the use of overlying cantilevered contours can be combined with continuous structures that penetrate through multiple layers, selective overfilling, offset joints and additional extrusions to mitigate leakage routes. Self-supporting closed cell structures can be built that form insulating regions by controlling convective losses.

A device for producing polymer films having a predefined spatial structure. The device includes: a linear stage, a platform for a substrate, a cylinder for spreading a polymer solution layer over the substrate to deposit a polymer film onto the substrate, a cylinder height adjustment system, a control system for adjusting a height and tilt of the cylinder in relation to the substrate, a controllable voltage source, one or more metallic electrodes fixed onto the cylinder. The substrate onto which the polymer film is deposited is conductive for electric current. Electric voltage from the controllable voltage source is applied between the metallic electrode and the substrate during deposition of the polymer film onto the substrate.

A device for producing polymer films having a predefined spatial structure. The device includes: a linear stage, a platform for a substrate, a cylinder for spreading a polymer solution layer over the substrate to deposit a polymer film onto the substrate, a cylinder height adjustment system, a control system for adjusting a height and tilt of the cylinder in relation to the substrate, a controllable voltage source, one or more metallic electrodes fixed onto the cylinder. The substrate onto which the polymer film is deposited is conductive for electric current. Electric voltage from the controllable voltage source is applied between the metallic electrode and the substrate during deposition of the polymer film onto the substrate.

The present disclosure provides a transferring method and a repeatable transferring method. The transferring method includes steps of: performing surface modification treatment on a transferring surface of a transfer mold to reduce surface free energy of the transferring surface; forming a liquid material layer on the transferring surface after the surface modification treatment; curing the liquid material layer to form a solid material layer; and releasing the solid material layer from the transfer mold.