688 results about "Water vapor permeability" patented technology

A composite material which is suitable as a wall covering comprises a substrate layer that is permeable to water vapor, such as a nonwoven web material made from cellulose and synthetic fibers, and that is coated, preferably extrusion coated, with a plastics material. In one embodiment the plastics material comprises an olefin polymer, olefin copolymer or blend of olefin (co)polymer and a particulate filler, e.g. calcium carbonate or a mixture thereof with titanium dioxide. In another embodiment the plastics material is a microporous breathable polymer film or a monolithic breathable polymer film.

A plastic container for liquid medicine, which, concerning the effective components of liquid medicine, is capable of prevention of deterioration in quality due to mixing of oxygen and water vapor, prevention of variation in concentration due to water volatilization and moisture absorption, etc. A plastic container for liquid medicine, which is a plastic container internally coated with DLC (diamond-like carbon) film wherein water vapor permeability is 0-0.006 g/container/day and oxygen permeability is 0-0.011 ml/container/day, such properties being obtained by optimizing the three conditions, composition, density and film thickness of the DLC film.

The invention belongs to the fields of waterproofing of buildings and solid powdering and relates to a preparation method of an organic silicon microcapsule powder waterproof agent. The preparation method comprises the following steps: preparing water-soluble high polymer wall material into a water solution; mixing a superfine inorganic mineral filler with an organic silicon high-efficient waterproof agent according to a certain proportion for forming homogeneous dispersion; adding a polymer solution and other auxiliaries into the dispersion and dispersing for forming a homogeneous, stable and dry dispersion liquid; performing spray-drying on the uniform and stable dispersion liquid for getting organic silicon waterproof agent microcapsule powder with a certain fineness; and collecting a product, sealing and preserving. The adopted water-soluble polymer film-forming wall material, the inorganic filler and the organic silicon high-efficient waterproof core material have good performances and have no adverse effects on the performances of basic materials, the adopted equipment is easy to operate and the prepared organic silicon powder is white; the organic silicon microcapsule powder waterproof agent has excellent water repellency and water vapor permeability; the organic silicon microcapsule powder waterproof agent can be re-dispersed and has excellent workability with water; and the solvent-free design is healthy and environmentally-friendly.

Provided are: an alkoysilyl group-containing hydrogenated block copolymer produced by introducing an alkoxysilyl group into a hydrogenated block copolymer that is obtained by hydrogenating 90% or more of unsaturated bonds of a block copolymer that includes at least two polymer blocks [A] and at least one polymer block [B], the polymer block [A] including a repeating unit derived from an aromatic vinyl compound as a main component, the polymer block [B] including a repeating unit derived from a linear conjugated diene compound as a main component, and a ratio (wA:wB) of a weight fraction wA of the polymer block [A] in the block copolymer to a weight fraction wB of the polymer block [B] in the block copolymer being 20:80 to 60:40; a method for producing the same; a solar cell element encapsulating material; a sheet, a laminated sheet; a multilayer sheet; and a method for encapsulating a solar cell element. The alkoxysilyl group-containing hydrogenated block copolymer exhibits low hygroscopicity, a low water vapor permeability, transparency, weatherability, and flexibility, maintains excellent adhesion to glass even when exposed to a high-temperature/high-humidity environment for a long time, and can encapsulate a solar cell element without applying a special waterproof treatment.

A laminate composite material comprises a layer of an open weave supporting fabric having a layer of breathable resin adhered thereto by an extruded layer of a thermoplastic resin blended with a high temperature volatile particulate. The resultant composite material is substantially impervious to air and water and permeable to water vapor and having a water vapor transmission rate exceeding one (1) perm of water vapor.

A porous food casing consisting essentially of a film of food grade thermoplastic having a plurality of interconnected interstices therein. The interstices are defined by a porosity modifier selected from the group consisting of soybean oil, peanut oil, corn oil, glycerin, polyethylene glycol, monolaurate, mineral oil, polyoxyethylene, sorbitan monostearate, sorbitan monooleate and glycerol monooleate. The interstices are in a range of approximately 0.002 to 1 micron and the casing has a water vapor permeability in a range of about 1 to 1500 gms/m2/min.

A warming article having a heat generating main body (4). The heat generating main body (4) is composed of a heat generating element (2) having water vapor generating capability and an air permeable holder (3) for holding the heat generating element (2). The heat generating main body (4) is configured to expand with heat generation of the heat generating element (2). The amount of water vapor generated from the warming article is preferably 1.0 to 100 mg/(cm²·10 min). The holder (3) preferably has a water vapor permeability of 1.5 to 10 kg/(m²·24 hr). The heat generating element (2) is preferably a sheet molded by papermaking and containing an oxidizable metal, a moisture-retaining agent, and a fibrous material.

A gas-barrier laminate comprises a plastic substrate (A), an inorganic thin film (B) formed on at least one surface of the plastic substrate (A), and a polyester-based resin layer (C) formed by applying a coating material containing a polyester-based resin on a surface of the inorganic thin film (B), wherein the polyester-based resin has a glass transition temperature of 50 to 70° C., a molecular weight of 1500 to 15000 and a hydroxyl value of 10 to 60 mg KOH/g, and the gas-barrier laminate has an oxygen permeability of not more than 5 cc/m²/day/atm and a water vapor permeability of not more than 5 g/m²/day. The gas-barrier laminate of the present invention is excellent in printability (in particular, gradation printability), is free from deterioration in gas-barrier property, namely is excellent in gas-barrier property, even after providing a printed layer thereon, and further exhibits an excellent adhesion between the plastic substrate (A) and the inorganic thin film (B) even after being subjected to retort treatments.

A laminated structure appropriate for use in constructing walls, floors, ceilings or doors, has a selected area and in one embodiment comprises two external layers of one or more materials such as, but not limited to, gypsum, at least one internal constraining layer having less than said selected area, and two or more internal layers of a viscoelastic glue separated by said at least one internal constraining layer, wherein each of said layers of viscoelastic glue is patterned to cover a selected percentage, but not all, of said area of said laminated structure thereby to allow moisture to pass through said structure.

The invention concerns a process for producing a polyolefin film having a combination of properties, specifically water vapor permeability and demonstrating reinforced liquid impermeability, said process comprising the steps of: coextrusion from a die of polyolefinic polymers and/or copolymers mixtures one of which at least contains inorganic fillers forming a precursor film; stretching of the precursor film to form a breathable multilayer film, which is characterized in that said precursor film is a base multilayer film having at least two contiguous layers of same composition, having at the structure "B"-"B", optionally associated to at least one layer having a different composition from the two contiguous layers "B"-"B", and having a specific characteristic.

A novel densified fluoropolymer article is described which has a water vapor permeation of about 0.015 g-mm/m²/day or less, and preferably has a matrix tensile strength of at least 10,000 psi in two orthogonal directions. The articles are made by compressing expanded porous PTFE at pressures, temperatures and times which result in elimination of the pores, and subsequent stretching above the crystalline melt temperature.

The invention discloses a method for preparing a polyester film for a solar cell backsheet film, which is characterized by comprising the following steps of: mixing 200 to 400 mass parts of binary acid, 80 to 160 mass parts of dihydric alcohol, 0.01 to 0.5 mass part of highly-branched polyatomic alcohol, an esterification catalyst for synthesis of polyester, a polycondensation catalyst and a stabilizing agent and carrying out an esterification reaction; adding 0. 1 to 1.0 mass part of high-grade polyenoic fatty acid or alcohol, continuously esterifying, filtering materials and pressing into a polycondensation kettle for a pre-polycondensation reaction so as to prepare modified polyester resin slices; mixing the modified polyester resin slices and master batch polyester slices according to a mass ratio of 100:5-30; and drying, melting, filtering, extruding, cooling a cast piece, biaxially drawing, performing molding treatment and the like so as to prepare the polyester film for the solar cell backsheet film. The film product has excellent mechanical and electrical performances, heat and humidity resistance, dimensional stability, flame retardant property and water vapor permeability resistance.

There are provided a polarizing plate that has excellent durability including both humidity resistance and heat resistance and is less likely to cause knick defects, and a method for production thereof. The polarizing plate includes: a polarizer including an iodine-containing polyvinyl alcohol resin and containing zinc; protective films each having a water-vapor permeability of 150 g/m² per 24 hours or less in an atmosphere at 40° C. and 90% RH; and an adhesive including a polyvinyl alcohol resin, a crosslinking agent and a colloidal metal compound with an average particle size of 1 to 100 nm, wherein the protective films are bonded to both side of the polarizer with the adhesive interposed between the protective layer and the polarizer.

The subject of the invention is a functional textile material (1), wherein the functional textile material (1) comprises a textile backing (2) in the form of a two-dimensional textile formation, and the textile backing (2) is provided with microcapsules (3), which contain at least one active ingredient, and the microcapsules (3) are secured to the textile backing (2) by means of an adhesive (4) applied discontinuously to the textile backing (2). In this way, one obtains a functional textile material (1) with high air-permeability and high water vapor-permeability at reduced basis weight, which material can be used in particular for making functional clothing.

The invention relates to a polyacrylate/nanometer ZnO composite finishing agent suitable for the base coating of clothing leathers, instep leathers and corrected leathers and a preparation method of the polyacrylate/nanometer ZnO composite finishing agent. The polyacrylate/nanometer ZnO composite finishing agent comprises the following raw materials by weight: 22wt%-28wt% of acrylic ester monomer, 2wt%-5wt% of emulsifying agent, 0.4 wt%-0.8 wt% of initiating agent, 0.2wt%-1.5 wt% of nanometer ZnO, 0.6 wt%- 5wt% of water-solubility high polymer materials, and the rest of deionized water. The preparation method comprises the following steps of: firstly, carrying out surface modification on the nanometer ZnO by adopting a water-solubility high molecular polymer, enabling the nanometer ZnO tobe uniformly dispersed in a water solution, then triggering the acrylic ester monomer to polymerize in site, and preparing the polyacrylate/nanometer ZnO composite finishing agent. Compared with the pure polyacrylate emulsion, the polyacrylate/nanometer ZnO composite finishing agent has the advantages that the water tolerance, the elongation at break, the air permeability and the water vapor permeability of a finished leather sample are all substantially increased.

Disclosed is a flexible display apparatus. The flexible display apparatus includes a display part, a first adhesive film, an optical film, a second adhesive film, and a window film sequentially stacked, and the second adhesive film has a water-vapor permeability of about 200 g/m²·24 hr or less, and the first adhesive film has a lower restoration force than the second adhesive film, as calculated by the Equation B set forth herein.

The invention discloses a solar energy rear panel and a preparation method of the solar energy rear panel. The solar energy rear panel comprises an inner surface layer, a core layer and an outer surface layer from inside to outside. By a mass rate, the inner surface layer is 10%-20%, the core layer is 20%-40%, and the outer surface layer is 40%-60%. The inner surface layer and the outer surface layer are made of polyamide resin, fillings and additive, and the core layer is made of the modified polypropylene resin composition. The modified polypropylene resin composition comprises the following components: 100 parts of polypropylene resin, 5-50 parts of graft polyethylene, 0-2.5 parts of additive and 0-100 parts of fillings. Meanwhile, the invention discloses the novel modified polypropylene resin composition used for the solar energy rear panel. Due to the novel modified polypropylene resin composition, a final product obtained has good low temperature resistance and impact resistance, meanwhile anti-aging performance and especially has performance of humidity resistance and resistance to aging. The solar energy rear panel prepared by the novel modified polypropylene resin composition is better than other rear panels in terms of water absorption, water vapor permeability, and interlaminar peeling and has excellent electrical insulating property. A shrinking rate, hot air aging and insulation property required by the solar energy rear panel are met, and the novel modified polypropylene resin composition can be used for solar energy battery components manufacturing .

Disclosed is a porous film made of a resin composition containing (I) (i) a propylene-ethylene copolymer or (ii) a polypropylene-based resin mixture containing a propylene-ethylene copolymer, each having an ethylene content of 3.0 to 7.0 wt. % and an MFR measured at 230° C. of 2.0 to 4.0 g/10 min and (II) a β-crystal nucleating agent; the film having a porosity of 20 to 80%, a Gurley air permeability of 5,000 sec/100 cc or lower as measured according to JIS P-8117, a water vapor permeability of 2,000 g/m²·24 h or higher as measured according to JIS Z-0208 and a water pressure resistance of 75 kPa or higher as measured according to JIS L-1092 using an aqueous surfactant solution; a process for producing the same; and an absorbent article employing the porous film as a backsheet.

The invention discloses a preparation method of high-density fine-denier double-surface double-layer PFY (Polyester Filament Yarn) fabric. The preparation method comprises the following steps of (1) raw material selecting; (2) space-variant compositing and sizing; (3) weaving; (4) dyeing and after-finishing. The high-density fine-denier double-surface double-layer PFY fabric which is generated by the preparation method has the characteristics that the fabric density is up to 120/cm, the fineness is only 50 denier, the finest fiber is only 0.02 DPF, the fabric is woven by adopting a double-layer exterior and interior interconnection organization, the thinnest thickness can be lower than 100 g/m<2>, the fabric is fine and smooth in weaving, abundant pattern textures, color matching and check and pattern combination can be formed, the feeling is soft and comfortable, the recoverability is strong, the air permeability, the water vapor permeability and the anti-static performance of the fabric are good, and the fabric is ideal fabric for manufacturing sports wear, jackets and suits. The comprehensive running rate of a weaving machine is up to 95%, the cloth surface is smooth, and the product yield is ensured.

The invention provides a method for improving hygienic performance of figured-island superfine fiber synthetic leather, which is characterized by comprising the following steps of: a) treating base cloth of the superfine fiber synthetic leather through collagen and making the collagen fixedly crosslinked to superfine fibers in the superfine fiber synthetic leather; b) penetrating and adsorbing a hydrophilic material in the superfine fiber synthetic leather treated by the collagen; and c) performing finishing treatment on the superfine fiber synthetic leather which is penetrated with the hydrophilic material. By treating the base cloth of the superfine fiber synthetic leather through the collagen and the hydrophilic material, because the collagen and the hydrophilic material have a plurality of hydrophilic groups, the hydrophilcity of the treated superfine fiber surface is equivalent to that of collagen fibers of natural leather, the water vapor permeability and water absorbing capacity of the synthetic leather are improved, and finally a coating with micropores is formed on the surface of the synthetic leather after the finishing treatment on the synthetic leather by using water-soluble polyurethane so as to integrally improve the water vapor permeability and air permeability of the synthetic leather.