Abstract:
A polymer composition containing a polymer (B) obtained by polymerizing a monomer composition containing: a methacrylic acid ester macromonomer (b1) represented by the following formula (1); and another monomer (b2). Also, a porous membrane formed from a membrane forming polymer (A) and the aforementioned polymer composition.
Abstract:
The present invention aims to provide a porous polymer membrane that is excellent not only in water permeability and alkali resistance but also in mechanical strength. The porous polymer membrane of the present invention includes a fluoropolymer (A) that includes a vinylidene fluoride unit and a tetrafluoroethylene unit.
Abstract:
To provide a method for easily producing an ethylene/tetrafluoroethylene copolymer porous material having excellent chemical resistance and filtration performance and has a high heat resistance, within a wide range of the porosity, and an ethylene/tetrafluoroethylene copolymer porous material obtained by such a process. A process for producing an ethylene/tetrafluoroethylene copolymer porous material which comprises a step of dissolving an ethylene/tetrafluoroethylene copolymer having repeating units based on ethylene and repeating units based on tetrafluoroethylene at a temperature of at most 300°C in a solvent which can dissolve the ethylene/tetrafluoroethylene copolymer at a temperature of at most 300°C, to achieve a predetermined concentration to obtain a solution, a step of forming the solution to obtain a formed product, and a step of cooling the formed product to a temperature of at most the phase separation temperature of the solution to solidify the ethylene/tetrafluoroethylene copolymer.
Abstract:
The invention relates to the production of microspheres having radial pores using thermally induced phase separation, especially microspheres for use in tissue engineering.
Abstract:
Provided is a porous para-oriented aromatic polyamide film which contains fine particles composed of a heat-resistant resin in an amount of 10 to 400 parts by weight based on 100 parts by weight of a pare-oriented aromatic polyamide and has a linear thermal expansion coefficient at 200 to 300°C of from -50x10 -6 /°C to +50x10 -6 /°C. The porous para-oriented aromatic polyamide film shows excellent tear propagation resistance and has light weight and low linear thermal expansion coefficient, and is suitable as a prepreg material used for a base substrate for printed circuit board.
Abstract:
Un procédé de préparation d'une membrane poreuse comporte les étapes de dissolution d'un matériau thermoplastique possédant à la fois des parties relativement non cristallines et des parties relativement cristallines dans un solvant sous des conditions de température et de durée provoquant la dissolution des parties relativement non cristallines du matériau thermoplastique alors qu'au moins une partie des parties relativement cristallines dudit matériau thermoplastique ne se dissous pas, mais forme une dispersion colloïdale dans ledit solvant. La dispersion colloïdale et le solvant sont façonnés en un film, en provoquant ensuite la précipitation des parties thermoplastiques dissoutes dans ledit film, afin de former une membrane poreuse.
Abstract:
Die Erfindung betrifft für Flüssigkeiten und Gase selektiv-durchlässige Folien sowie rohrförmige Gebilde auf Basis eines Copolymerisates, das aus copolymerisiertem fluoriertem Olefin, copolymerisiertem Vinylacetat und gege benenfalls copolymerisiertem Olefin aufgebaut ist, wobei die Acetatgruppen des Copolymerisates gegebenenfalls zu OH- Gruppen verseift sein können, wobei die Folien bzw. rohrför migen Gebilde jeweils inhärente latente Strukturumwandel- barkeit besitzen. Die Erfindung umfaßt ferner Verfahren zur Herstellung der bezeichneten Formkörper sowie Verfahren zu deren Strukturumwandlung. Die Erfindung betrifft ferner die Verwendung erfindungs gemäßer Formkörper.
Abstract:
A process for producing non-porous microcellular film comprising preparing a casting solution of a polymer; casting the polymer solution as a wet film onto a substrate; partially drying the cast film and concurrently contacting the film with an anti-solvent in vaporous form, thereafter drying the film. The product is a film having a thin non-porous skin and a section having thin-walled cells. The non-porous skin is on that portion of the polymer exposed to the vaporous antisolvent atmosphere.