PURPOSE: To obtain a hydrophilic microporous membrane which is extremely thin and has a high void content, excellent mechanical strength and micropores, by grafting a hydrophilic org. hydrocarbon monomer onto a microporous membrane composed of a high-molecular polyethylene.
CONSTITUTION: A hydrophilic org. hydrocarbon monomer is grafted onto a microporous membrane having a thickness of 0.1W10μ, a void content of 30W95%, an average particle size of 0.01W4μ and a breaking strength of 200kg/cm2 or above, composed of polyethylene having a weight-average MW of 5×105 or above. The mechanical strength of the resulting microporous membrane varies depending on the weight-average MW of polyethylene. When the weight-average MW is less than 5×105, the membrane is extremely thin and one having a satisfactory high strength can not be obtd., while an ultra-high- molecular weight polyethylene having a weight-average MW exceeding 1×107 has a difficulty in preparing the membrane by stretching.
KONO KOICHI
MIYASAKA KENJI
KOMATSU MASATO
TABUCHI JOICHI
| JPS5859072A | 1983-04-07 | |||
| JPS56110749A | 1981-09-02 |