Ppg Industries Ohio, Inc.

Ppg Industries, Inc.

Paul L Benenati

Luciano M Parrinello

James L Boyer

Richard A Schwarz

Harlan B Johnson

Charles R Coleman

William A Williams

Thomas A Rechlicz

Charles T Hill

Narayan K Raman

Charles F Kahle

Barbara J Anderson

Larry E Lipko

Peter M Nowakowski

Joseph P Kovacs

Randall D Rogers

Michael H McGarry

Pamela L Campbell

Provided is a microporous material, e.g., a microporous sheet material, having a matrix of polyolefin, finely-divided, substantially water insoluble particulate filler, a network of interconnecting pores communicating throughout the microporous material, and at least one retrospectively identifiable taggant material embedded within the matrix, optionally the at least one taggant being unique to an end user for the microporous material, wherein the polyolefin is present in the microporous material in an amount of 20 to 35 weight percent, based on the weight of the microporous material. The taggant material provides a marker, signature or code that is capable of retrospective identification by machine, instrument or by the naked eye. Articles including the microporous material and processes for preparing the microporous material also are provided.

Microporous material containing a security feature

Provided is a microporous material including a polyolefin matrix material; finely divided, substantially water-insoluble filler distributed throughout the matrix material, where the filler includes a positive amount of titanium dioxide; a network of interconnecting pores communicating throughout the microporous material; and optionally, a contrasting enhancing amount of a contrast enhancing material. The sum of the weight percent of the titanium dioxide and the weight percent of the optional contrast enhancing material is at least 3 weight percent based on total weight of the microporous material. Multilayer articles having a layer of the microporous material also are provided.

Laser markable microporous material

A water resistant coating composition for ink jet recordable substrates having a pH of less than 7, which includes:

Ink recordable substrate coating composition having a pH less than 7

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.

Microporous material exhibiting low alkali metal content

The tendency of microporous material to discolor over a period of time when exposed to the atmosphere during normal usage can be reduced if the microporous material comprises whiteness retaining organic surface active agent.

Microporous material exhibiting increased whiteness retention

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Wadsworth, OH, United States of America

Paul L Benenati