Abstract:
A process is disclosed for producing porous polymer globules. Polymers, preferably polyolefins or PVC, are dissolved in a solvent, preferably halogenated hydrocarbons or alkyl esters, at temperatures close to the boiling point of the solvent. The hot polymer solution is cooled and the polymer globules formed during the cooling process are separated, washed and dried. The porous polymer globules are for example useful as catalyst carriers or as adsorbing products.
Abstract:
폴리올레핀 30 내지 60 중량%와 상기 폴리올레핀과 열역학적으로 액-액 상분리를 이룰 수 있는 희석제 70 내지 40 중량%를 포함하는 조성물을 압출기내로 주입하고, 용융 혼련하여 단일상의 용융물을 제조하는 단계; 및 액-액 상분리 온도 이하인 구간을 통과시켜 액-액 상분리를 진행시키며 압출하여 시트 형태로 성형하는 단계를 포함하는 폴리올레핀 미세다공막의 제조방법 및 이를 이용하여 제조된 폴리올레핀 미세다공막이 제시된다.
Abstract:
Microporous materials and articles are disclosed. The microporous materials contain a crystallizable propylene-containing polymer, a beta-nucleating agent, and a diluent that is miscible with the polymer at a temperature above the melting temperature of the polymer and that phase separates from the polymer at a temperature below the polymer crystallization temperature. The invention is also directed to methods of forming the microporous material using thermal induced phase separation and subsequent processing.
Abstract:
The present invention relates to a limited use product with an elastic breathable film as a barrier layer. The elastic breathable film is produced from phase-separation of an elastomeric resin. A method of producing the limited use product is also described.
Abstract:
A process is described for making useful porous articles from poly(etheretherketone)-type (PEEK) polymers. High boiling point polar organic solvents are solvents for poly(etheretherketone)-type polymers (PEEK). Solutions of PEEK may be used to form PEEK articles such as microporous membranes of films and fibers, including microporous hollow fibers. The microporous PEEK is useful as microfiltration or ultrafiltration membranes. PEEK articles, including microporous sheet membranes and microporous hollow membrane fibers are disclosed.
Abstract:
A process for making a polymeric, porous hollow fibre (21) by heating a mixture of a thermoplastic polymer and a solvent to a temperature and for a time for the polymer and solvent to mutually dissolve, then introducing the molten mixture into an extrusion head adapted to shape the hollow fibre. The shaped fibre is then cooled in the extrusion head to a temperature so that non-equilibrium liquid-liquid phase separation takes place to form a bi-continuous matrix of the polymer and solvent in which the polymer and solvent form two intermingled separate phases of large interfacial surface area. Finally, the solvent is removed from the polymer. The extrusion head for forming the above-mentioned polymeric, porous hollow fibre has an elongated body (17, 18) defining an axial passageway (11) for receiving a lumen-forming fluid (14) and a first annular passage (12) therearound for receiving the molten mixture (15) from which the hollow fibre (21) is formed. A second annular passageway (13) is radially outward of the first annular passageway (12) and receives a coating fluid (16). A third annular passageway (19) receives a cooling fluid and has means (20) for directing the cooling fluid towards the outer surface of the coating fluid (16). The porous polymeric material of the fibre produced by the above-mentioned process has a lacey or filamentous structure consisting of a plurality of polymer strands connected together at spaced apart locations along each strand.
Abstract:
A pseudo-gel comprising a suitable solvent in an amount of 1 to 10 percent by weight and an ultra-high-molecular-weight polyethylene in an amount of 99 to 90 percent by weight, said polyethylene being a semicrystalline network with adjustable crystalline morphology comprising randomly dispersed and oriented chain-folded single crystals, stacks of single crystals, spherulite crystals, and extended-chain shish-kebab-type of fibrils with lengths up to a few millimeters and widths up to 20 mu m. Also, the semicrystalline ultra-high molecular-weight polyethylene obtained by removal of said solvent from the pseudo-gel. Further, the method for making the pseudo-gel and the ultra-high-molecular-weight polyethylene product.
Abstract:
The present invention relates to an open cell thermoplastic sulfonated polystyrene porous xerogel for absorbing hydrophobic liquid, wherein at least some of the sulfonated groups are neutralised.
Abstract:
La presente invención se refiere a un artículo de polímero de tipo PEEK poroso que comprende una estructura de polímero de tipo PEEK porosa y que presenta al menos una distribución de poros trimodal. La invención describe un procedimiento para la producción de dicho artículo de polímero de tipo PEEK poroso que comprende: a) poner en contacto un polímero de tipo PEEK con una composición que comprende al menos un disolvente orgánico, b) calentar a una temperatura a la que se disuelve el polímero de tipo PEEK, c) añadir al menos un agente porógeno, d) enfriar la mezcla obtenida en c) a una temperatura al menos igual o menor que la temperatura a la que precipita el polímero de tipo PEEK, e) conformar dicha mezcla enfriada para dar un artículo conformado, f) retirar el disolvente orgánico y el agente porógeno, y g) recuperar el artículo de polímero de tipo PEEK.