Donaldson Comapny, Inc.

Thomas M Weik

Mark Alan Gogins

Hoo Young Chung

Douglas G Crofoot

John R B Hall

Suresh Laxman Shenoy

Gary Ray Gillingham

Marty A Barris

Jim C Rothman

Derek Owen Jones

Donald R Monson

James A LeBlanc

Dustin Allen Zastera

Jacob C Savstrom

Matthew P Goertz

Kelly C Robertson

Pete A Betts

John M Buettner

John Rb Hall

Klenton T Willis

Patricia A Ignacio-de Leon

James D Benson

Suresh L Shenoy

John Hall

This disclosure describes a filter medium that minimizes the adverse effects of variations in flow rate on filter medium efficiency without a corresponding increase in pressure drop. The filter medium includes a support layer, a continuous fine fiber layer, and an efficiency layer. The continuous fine fiber layer includes a continuous fine fiber that has a diameter of up to 10 micrometers and is located downstream of the efficiency layer.

Filter medium comprising a fine fiber layer

The present disclosure provides a unique fine fiber material that is formed from a fiber-forming polyamide with a fluorochemical urethane additive, a method of making such fiber material, as well as filter media and filter elements including such fibers.

Oleophobic polyamide fine fibers, methods, filter media, and filter elements

A fiber can be made having a structure with an axial core and a coating layer. The fiber can have a polymer core and one or two layers surrounding the core. The fine fiber can be made from a polymer material and a resinous aldehyde composition such that the general structure of the fiber has a polymer core surrounded by at least a layer of the resinous aldehyde composition.

Fibers made from soluble polymers

Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.

Fine fiber media layer

The present disclosure provides a unique fine fiber material that is formed from a fiber-forming polymer material with at least two reactive additives that are capable of reacting with each other, and optionally reacting with the fiber-forming polymer.

Fine fibers made from reactive additives

A fine fiber can be made having a structure with an axial core and a coating layer. The fiber can have a polymer core and one or two layers surrounding the core. The fine fiber can be made from a polymer material and a resinous aldehyde (e.g., melamine-aldehyde) composition such that the general structure of the fiber has a polymer core surrounded by at least a layer of the resinous aldehyde composition.

Fine fibers made from polymer crosslinked with resinous aldehyde composition

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Deephaven, MN, United States of America

Thomas M Weik