Michael M Mcgarry

US Patent:

55831710, Dec 10, 1996

Filed:

Mar 31, 1994

Appl. No.:

8/221203

Inventors:

Richard A. Schwarz - Akron OH
Paul L. Benenati - Wadsworth OH
Michael H. McGarry - Wexford PA

Assignee:

PPG Industries, Inc. - Pittsburgh PA

International Classification:

C08J 307

US Classification:

524261

Abstract:

Microporous material comprising water insoluble thermoplastic organic polymer and particulate amorphous precipitated silica not only exhibits low particulate emissions during handling and use, but also has a low extactable alkali metal content. Microporous material having these characteristics is especially useful in clean rooms where electronic devices such as integrated circuits are manufactured. Such microporous material may be produced by employing amorphous precipitated silica particles having low alkali metal content as all or a substantial proportion of the amorphous precipitated silica particles constituting the microporous material.