109 results about "Cellulose acetate film" patented technology

An optical compensatory sheet comprises a cellulose acetate film. The film contains 100 weight parts of cellulose acetate having an acetic acid content of 59.0 to 61.5% and 0.01 to 20 weight parts of an aromatic compound having at least two aromatic rings. The cellulose acetate film has an Re retardation value measured at 550 nm (Re550) in the range of 0 to 200 nm and an Rth retardation value measured at 550 nm (Rth550) in the range of 70 to 400 nm. The cellulose acetate film further has a thickness in the range of 10 to 70 μm. The optical compensatory sheet is used in a liquid crystal display.

A cellulose acetate film is produced from a solution of a cellulose acylate in a mixed solvent. The mixed solvent comprises a main solvent and an alcohol. The mixed solvent essentially does not contain chlorine atom. The main solvent comprises an ester and a ketone. The ester has a solubility parameter of 16 to 23. The ketone has a solubility parameter of 16 to 23. The alcohol has a solubility parameter of 20 to 30. The mixed solvent comprises the ester in an amount of 58 to 96 wt. %, the ketone in an amount of 2 to 15 wt. %, and the alcohol in an amount of 2 to 40 wt. %.

A method of film fabrication is taught that uses a coating and drying apparatus to fabricate resin films suitable for optical applications. In particular, cellulose acetate films are prepared by simultaneous application of multiple liquid layers to a moving carrier substrate. After solvent removal, the cellulose acetate films are peeled from the sacrificial carrier substrate. Cellulose acetate films prepared by the current invention exhibit good dimensional stability and low birefringence.

A cellulose acetate film is made of a cellulose acetate having an acetic acid content of 59.0 to 61.5%. The film is controlled to have a Re retardation value in the range of 0 to 20 nm, a Rth retardation value in the range of 30 to 70 nm, and a thickness in the range of 10 to 70 nm.

The invention discloses a method for preparing hydrophobic cellulosic organic nano clay composite heavy-metal ion adsorbing ceramsites and belongs to the field of composite materials. The method comprises the steps of firstly carrying out organizing treatment on sodium-based montmorillonite so as to obtain organic montmorillonite and change hydrophilic montmorillonite into hydrophobic montmorillonite, then, depositing a titanium dioxide film on the surface of a cellulose acetate film by a surface sol-gel method, carrying out pulping, then, preparing hydrophobic composite cellulose acetate film pulp by using an octadecyl trimethoxy silane toluene solution, loading the hydrophobic composite cellulose acetate film pulp and the organic montmorillonite to a high-speed emulsifying homogenizer together for intercalation, and finally, carrying out granulating and calcining, thereby obtaining the ceramsites. The material prepared by the method has a superficial hydrophobic effect and has good adsorption to heavy-metal ions, the heavy-metal ions can be recovered by a calcining method, no waste gas and waste liquid is discharged during preparation, and the product is biodegradable and environment-friendly.

A liquid crystal display of OCB mode or VA mode comprises a backlight unit, a backlight-side polarizing plate, a liquid crystal cell of OCB mode or VA mode, and a viewer-side polarizing plate in order. The viewer-side polarizing plate comprises a first transparent protective film, a polarizing membrane, a second transparent protective film and a light-diffusing layer in order. In the liquid crystal display of OCB mode, an optically anisotropic layer is formed from liquid crystal compound on the first transparent protective film. The first transparent protective film is a cellulose acetate film having a Re retardation value of 20 to 70 nm and a Rth retardation value of 100 to 500 nm. The light-diffusing layer comprises transparent resin and transparent fine particles dispersed therein. The transparent resin and the transparent fine particles have refractive indices that are different from each other.

A biodegradable paper-plastic composite structure comprises: at least one cellulose acetate or derivative film thereof; the invention discloses a paper base material. The cellulose acetate or cellulose acetate derivative film is combined with a paper base material to form a paper-plastic composite structure. The cellulosic material included in the formulation includes cellulose acetate having a degree of substitution of 1.5 to 2.8 or a derivative thereof; and a plasticizer capable of reducing the softening temperature of cellulose is also included. The basic paper material is paper obtained after cellulose pulp is physically processed, such as kraft paper and parchment. The preparation method of the biodegradable paper-plastic composite structure comprises the following steps: compoundinga cellulose acetate film through a heating and pressurizing method, or compounding through a solution coating method, namely coating the surface of paper with a cellulose acetate solution; and evaporating a solvent to prepare a cellulose acetate-containing paper composite material. The product disclosed by the invention can be applied to the field of food or packaging, and can be naturally degraded to eliminate or reduce the problem of environmental pollution caused by packaging materials.

The invention discloses a preparation method of an ordered nano fiber-based flexible graphene film by the induction of capillary action. The preparation method comprises the following steps of dissolving cellulose acetate in acetic acid, uniformly mixing and agitating, so as to obtain a spinning solution, carrying out electrostatic spinning, and drying, so as to obtain a cellulose acetate film; preparing graphene oxide, and purifying and separating through a microporous filtering film to obtain a graphene oxide lamella which is uniform in size and soluble in water; uniformly dispersing the graphene oxide in a substrate of the cellulose acetate film by utilizing a vacuum suction filtration method, and drying to subsequently prepare and obtain a graphene oxide film; thermally reducing a sample of the graphene oxide film through hot compression, so that the flexible graphene film using the cellulose acetate film as the substrate, which is prepared by the induction of the capillary action,can be obtained. A tiny capillary is formed in a micron-nano dimension by utilizing the substrate; the graphene oxide infiltrates to enter the surface of the substrate by utilizing the principle of the capillary action; the physical interaction and the adhesive force, with the substrate, of the graphene oxide film are greatly improved and thus, the flexible graphene film can adapt to the abuttingand the application on the surface of a complicated curved surface.