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

IPC: C03C25/68 ,  C03C25/06

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。

公开(公告)号：US3923533A

公开(公告)日：1975-12-02

申请号：US44719974

申请日：1974-03-01

Applicant: PPG INDUSTRIES INC

Inventor： HAMMEL JOSEPH J ,  ALLERSMA TIES

IPC: B01D39/06 ,  B01D53/86 ,  B01J21/08 ,  B01J37/06 ,  C03C3/06 ,  C03C3/064 ,  C03C3/089 ,  C03C3/091 ,  C03C11/00 ,  C03C15/00 ,  C03C3/08 ,  C03C3/30

CPC classification number: B01D71/04 ,  B01D39/06 ,  B01D53/86 ,  B01D67/0058 ,  B01J21/08 ,  B01J37/06 ,  C03C3/06 ,  C03C3/064 ,  C03C3/089 ,  C03C3/091 ,  C03C11/005 ,  C03C15/00 ,  C03C2201/10 ,  C03C2201/32 ,  C03C2201/50 ,  C03C2201/80 ,  C03C2203/00 ,  C03C2203/10 ,  C03C2203/50

Abstract: Thermally stable, mechanically strong microporous glass articles with large pore volumes, surface areas, and varying pore sizes, and methods for making such articles are disclosed. In particle form, such as beads, the microporous glass articles are useful as catalyst supports in applications such as petroleum catalytic refiners, chemical processes and motor vehicle catalytic mufflers. The mechanical strength and the dimensional stability of the microporous glass articles at elevated temperatures can be improved if the articles are preshrunk, such as by brief exposure to high temperatures, before their intended use, and can be improved even further if treated with certain metal oxides.

Abstract translation: 公开了具有大孔体积，表面积和不同孔径的热稳定的机械强度微孔玻璃制品及其制造方法。 在颗粒形式如珠粒中，微孔玻璃制品可用作催化剂载体，例如石油催化精炼机，化学工艺和汽车催化消声器。 如果在预期的使用之前，如在短时间暴露于高温下预制物品，则可以提高微孔玻璃制品在高温下的机械强度和尺寸稳定性，并且如果用某些金属氧化物 。

公开(公告)号：US3923688A

公开(公告)日：1975-12-02

申请号：US44719474

申请日：1974-03-01

Applicant: PPG INDUSTRIES INC

Inventor： HAMMEL JOSEPH J ,  ALLERSMA TIES

IPC: B01D39/06 ,  B01D53/86 ,  B01J20/32 ,  B01J21/08 ,  B01J21/12 ,  B01J37/06 ,  C02F1/68 ,  C03C3/06 ,  C03C3/064 ,  C03C3/089 ,  C03C3/091 ,  C03C11/00 ,  C03C15/00 ,  B01J21/02

CPC classification number: C03C15/00 ,  B01D39/06 ,  B01D53/86 ,  B01D67/0058 ,  B01D71/04 ,  B01J20/3204 ,  B01J20/3236 ,  B01J20/3289 ,  B01J21/08 ,  B01J37/06 ,  C02F1/681 ,  C03C3/06 ,  C03C3/064 ,  C03C3/089 ,  C03C3/091 ,  C03C11/005 ,  C03C2201/10 ,  C03C2201/32 ,  C03C2201/50 ,  C03C2201/80 ,  C03C2203/10 ,  C03C2203/50 ,  Y10S210/924 ,  Y10S502/501 ,  Y10S502/503

Abstract: Thermally stable, mechanically strong microporous glass articles with large pore volumes, surface areas, and varying pore sizes, and methods for making such articles are disclosed. In particle form, such as beads, the microporous glass articles are useful as catalyst supports in applications such as petroleum catalytic refiners, chemical processes and motor vehicle catalytic mufflers. The mechanical strength and the dimensional stability of the microporous glass articles at elevated temperatures can be improved if the articles are preshrunk, such as by brief exposure to high temperatures, before their intended use, and can be improved even further if treated with certain metal oxides.

公开(公告)号：US3630700A

公开(公告)日：1971-12-28

申请号：US3630700D

申请日：1969-05-06

Applicant: PPG INDUSTRIES INC

Inventor： HAMMEL JOSEPH J

IPC: A24D3/16 ,  C03B19/10 ,  C03C11/00 ,  C03B21/00 ,  C03C15/00

CPC classification number: A24D3/16 ,  C03B19/1065 ,  C03B19/108 ,  C03C11/005

Abstract: This invention relates to a process for forming small particles of microporous glass having interconnected pores suitable to filter tobacco smoke. It particularly relates to a method of melting a phase-separable, metal borosilicate glass composition, quenching the melted glass by contacting the molten glass with a quenching fluid to reduce rapidly the temperature below the strain point of the glass, thereby fracturing the glass into small fragments, phase separating the fragmented glass by 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, then cooling the phase-separated glass, and thereafter leaching the glass to remove a sufficient quantity of the boraterich phase to form microporous particles having interconnected pores.

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

IPC: A24D3/16 ,  A24B15/02 ,  A24F13/06

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.