Filter media

• US 20060016749A1
• Filed: 07/22/2004
• Published: 01/26/2006
• Est. Priority Date: 07/22/2004
• Status: Active Grant

• Current Assignee: W. L. Gore & Associates (W.L. Gore & Associates)
• Original Assignee: Gore Enterprise Holdings Incorporated
• Inventors: Gebert, Richard E., Debes, Michael H.
• Granted Patent: US 7,138,057 B2
• Time in Patent Office: Days
• US Class Current: 210/490
• CPC Class Codes: B01D 39/1692 Other shaped material, e.g. perforated or porous sheets
• CPC Class Codes: B01D 39/18 the material being cellulose or derivatives thereof cork or peat B01D39/1646 ; making filter paper D21F11/14

Abstract

In one aspect, the invention provides an article consisting essentially of a paper layer including about 10 Wt % to about 40 Wt % of a thermoplastic polymer and an ePTFE membrane laminated to the paper layer. Preferably, the paper layer includes about 10 Wt % to about 30 Wt % of a thermoplastic polymer. More preferably, the paper layer includes about 18 Wt % to about 25 Wt % of a thermoplastic polymer. A paper layer including about 20 Wt % of a thermoplastic polymer is most preferred. In another aspect, the thermoplastic polymer may comprise poly vinyl acetate.

In yet another aspect, the invention provides a filter media consisting essentially of a cellulose paper layer including about 20 Wt % poly vinyl acetate binder; and an ePTFE membrane laminated to said cellulose paper layer. In still another aspect, the invention provides a paper layer in which the paper is cellulose paper.

In yet another aspect, the invention provides a method of making a filter media consisting essentially of: providing a cellulose paper layer including about 20 Wt % of poly vinyl acetate, providing an ePTFE membrane to at least one surface of the cellulose paper layer; and laminating the ePTFE membrane to the cellulose paper layer.

Claims

1. An article consisting essentially of:

a) a paper layer including about 10 Wt % to about 40 Wt % of a thermoplastic polymer; and

b) a hydrophobic ePTFE membrane laminated to the paper layer.

2. The article of claim 1 in which the thermoplastic polymer is poly vinyl acetate.

3. The article of claim 2 in which the paper layer includes about 10 Wt % to about 30 Wt % of a thermoplastic polymer.

4. The article of claim 2 in which the paper layer Includes about 18 Wt % to about 25 Wt % of a thermoplastic polymer.

5. The article of claim 2 in which the paper layer includes about 20 Wt % of a thermoplastic polymer.

6. The article of claim 2 in which the paper layer comprises cellulose paper.

7. A filter media consisting essentially of:

a) a cellulose paper layer including about 20 Wt % poly vinyl acetate binder having an upstream side and a downstream side relative to the direction of airflow; and

b) a hydrophobic ePTFE membrane laminated to the upstream side of said cellulose paper layer.

8. A method of making a filter media consisting essentially of

a) providing a cellulose paper layer including about 20 Wt % of poly vinyl acetate;

b) providing a hydrophobic ePTFE membrane to at least one surface of the cellulose paper layer; and

c) laminating the ePTFE membrane to the cellulose paper layer.