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公开(公告)号：US3650721A
公开(公告)日：1972-03-21
申请号：US3650721D
申请日：1969-05-06
Applicant: PPG INDUSTRIES INC
Inventor： HAMMEL JOSEPH J , MACKENZIE JOHN D
CPC classification number: C03C25/68
Abstract: This invention relates to a process for forming small particles of microporous glass having inter-connected pores suitable to filter tobacco smoke. It particularly relates to a method of melting a phase-separable borosilicate glass composition, especially alkali borosilicates, forming the glass into a workable form, especially fibers, at elevated temperatures, phase separating the glass by heat treatment at elevated temperatures below the miscibility temperature of the glass for a sufficient period to form a silica-rich phase and a substantially continuous borate-rich phase, cooling the phase-separated glass, sizing the phase-separated glass, and leaching the glass to remove a sufficient quantity of the borate-rich phase to form microporous articles having inter-connected pores.
Abstract translation: 本发明涉及形成具有适于过滤烟草烟雾的相互连通的孔的微孔玻璃微粒的方法。 它特别涉及一种将可分离的硼硅酸盐玻璃组合物，特别是碱金属硼硅酸盐熔化的方法，将玻璃在升高的温度下形成可加工的形式，特别是纤维，通过在低于混合温度 玻璃足够长的时间以形成富二氧化硅相和基本上连续的富硼相，冷却相分离的玻璃，对相分离的玻璃进行定径，并浸出玻璃以除去足够量的富含硼酸盐 相形成具有相互连通的孔的微孔制品。
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公开(公告)号：US3602233A
公开(公告)日：1971-08-31
申请号：US3602233D
申请日：1969-05-06
Applicant: PPG INDUSTRIES INC
Inventor： HAMMEL JOSEPH J , MACKENZIE JOHN D
CPC classification number: A24D3/166
Abstract: A tobacco smoke filter medium of microporous glass. A suitable microporous glass is an acid-leached, phase-separated, borosilicate glass, especially alkali borate silicate glass. The porous glass is used in bulk, granular, or fibrous form. The porous glass may be treated in an atmosphere of water vapor to increase the concentration of hydroxyl groups on the surfaces of the pores. The microporous glass filtering material is disposed in a downstream end of the smoke conduit of a smoking device which is adapted to accommodate a charge of tobacco. The glass particles present a microporous skeletal structure in which the SiO2 content is at least about 90 percent by weight.
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公开(公告)号：US3615761A
公开(公告)日：1971-10-26
申请号：US3615761D
申请日：1968-01-31
Applicant: PPG INDUSTRIES INC
Inventor： SAKKA SUMIO , MACKENZIE JOHN D
Abstract: This invention relates to phototropic articles containing thallous halides. It particularly relates to thallous halide containing glasses and glass-ceramics, particularly glasses and glass-ceramics containing thallous halides which have been doped with a metal such as copper or indium.
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