Ethylene-vinyl alcohol copolymer membrane and a method for producing the same
AssigneeKuraray Co., Ltd.
InventorsShuzo Yamashita, Syuji Kawai, Hirokuni Tanii, Koichi Takakura
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Abstract
There is described an ethylene-vinyl alcohol copolymer membrane comprising at least a skin layer on its surface and a porous layer supporting the skin layer. The porous layer, when the membrane is observed in the dry state with an electron microscope, contains vacuoles or voids, which present a mono- or multi-layer structure and have straight-line lengths corresponding to 20-99% of the whole thickness of the membrane. In addition, the polymer portion of the porous layer has micropores with an average pore diameter of 0.1-5 microns and the membrane has a porosity of 60-90%.
Claims6
An ethylene-vinyl alcohol copolymer membrane comprising at least a skin layer on the surface thereof and a porous layer supporting said skin layer, wherein said porous layer, when said membrane is observed in the dry state with an electron microscope, comprises a plurality of vacuoles or voids, which present a mono- or multi-layer structure, with an average straight-line length corresponding to 20-99% of the whole thickness of the membrane, and the polymer portion of said porous layer comprises micropores with an average diameter of 0.1-5 microns, and said membrane has a porosity of 60-90%.
Dependencies are inferred from the claim text.