Method for preparation of porous glass film,申请号US19830528789-传众专利搜索

Method for preparation of porous glass film

申请公布号：US4521236(A)

申请号：US19830528789

申请日期：1983.09.02

申请公布日期：1985.06.04

申请人：

KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO

发明人：YAMAMOTO, MINORU;SAKATA, JIRO;DOI, HARUO

分类号：B01D53/22;B01D71/04;B81C1/00;C03B8/00;C03B20/00;C03B37/075;C03C11/00;C03C13/00;C03C25/68;(IPC1-7):C03C25/06

主分类号：B01D53/22

摘要：There is provided a method for preparation of porous glass films, preferably in the form of a hollow filament, comprising heating glass films, formed from sodium borosilicate glass having a composition which can be phase-separated by heat-treatment into a soft phase easily eluted with a hot acid solution and a hard phase not easily eluted with the same solution, to separate the glass phase into the two phases and then subjecting the glass film to plasma etching in an atmosphere containing gaseous fluorine-containing compound(s) before or after acid elution of the soft phase. The thus obtained porous glass films have a uniform pore diameter and smooth surfaces and can be used as a variety of separating membranes.