Abstract:
A microporous polyolefin membrane comprising a polyethylene resin, and polypropylene having a weight-average molecular weight of 6 x 10 5 or more and a heat of fusion of 90 J/g or more (measured by a differential scanning calorimeter), a fraction having a molecular weight of 1.8 x 10 6 or more being 10% or more by mass of the polypropylene.
Abstract:
A polymeric fiber for use in gas separation is formed from a spin dope which includes solvent and non-solvent materials. The fiber is passed through a quench bath, and then a leach bath, in which the solvent and non- solvent are removed. The quench bath and the leach bath include sets of rollers which transport the fiber through the system. Each set of rollers in the leach bath operates at a speed which is greater than or equal to the speed of the rollers which are immediately upstream. Thus, the fiber is stretched, in different amounts, at the same time that the solvent and non- solvent are being removed, and while the fiber is still wet. The resulting fiber has been found to exhibit superior flux and selectivity properties.
Abstract:
A filter for microfluidic systems adapted to trap or retain micro particles is formed by perforating a polymer film and laminating the perforated film between two substrates which incorporate microfluidic channels.
Abstract:
본 발명은 기능성 나노포어를 가지는 활성층 및 막 단백질을 포함하는 지질 이중막 구체를 포함하는 다공성 지지층을 포함하는 하이브리드 형 액체 여과 구조체에 관한 것이다. 본 발명의 일 구체예에 따른 액체 여과 구조체는 여과 효율이 높으면서도 투과성과 내구성이 우수하여 물을 비롯한 액체를 정제하는 여과 장치에 효과적으로 사용할 수 있다.
Abstract:
Disclosed is a method of producing a microporous polymer membrane, comprising: providing a polymer material; melting the polymer material; forming a precursor film by cooling and crystallizing the molten polymer material using an air knife; extending the precursor film; annealing the extended precursor film, primary stretching the annealed precursor film; forming a preliminary membrane by subjecting the primary stretched film to secondary stretching at a high temperature, and forming a microporous polymer membrane by heat setting the preliminary membrane. A microporous polymer membrane produced by the method is also provided.
Abstract:
A method for producing a nozzle useful in generating a fine aerosol for delivery of a therapeutic or diagnostic agent is provided. The method comprises treating a thin, preferably flexible material having partially formed nozzles with a plasma which alters the size and shape of the nozzles. The pores in the nozzles so formed preferably have an unflexed exit aperture diameter in the range of about 0.5 to about 25 microns, depending on the size of the aerosol particles desired for a given application. The pores in the nozzles can have a variety of shapes and can be distributed in a variety of patterns. An elevated area can be formed around the exit aperture of the nozzle in order to prevent intrusion of liquid back into the nozzle. A method of producing an aerosolization device incorporating such a nozzle is also provided.
Abstract:
Membrane microfilters are formed in situ in a defined region of a blank (c) by embossing one surface of the defined region (e) of the blank (c) to provide an array of indentations (h), and ablating the material of the blank in the defined region until the indentations become through pores (p). Ablation may be carried out by various means such as chemical etching or laser ablation.
Abstract:
A catalytic composite is formed of a catalytic layered assembly including a porous catalytic fluoropolymer film and one or more felt batts connected with the porous catalytic fluoropolymer film. At least one felt batt is positioned adjacent the upstream side of the porous catalytic fluoropolymer film to form the catalytic composite. The fluoropolymer film is perforated to allow for enhanced airflow therethrough while retaining the capability of catalyzing the reduction or removal of chemical species in fluid flowing through the catalytic composite.