Irving B Sachs

US Patent:

52230902, Jun 29, 1993

Filed:

Dec 11, 1991

Appl. No.:

7/805025

Inventors:

John H. Klungness - Madison WI
Daniel F. Caulfield - Madison WI
Irving B. Sachs - Madison WI
Marguerite S. Sykes - Madison WI
Freya Tan - Madison WI
Richard W. Shilts - Stoughton WI

Assignee:

The United States of America as represented by The Secretary of
Agriculture - Washington DC

International Classification:

D21H 1116

US Classification:

162 9

Abstract:

The present invention relates to a method for loading a chemical compound within the fibers of a fibrous material and to the fibrous materials produced by the method. In the method, a fibrous cellulose material is provided which consists of a plurality of elongated fibers having a fiber wall surrounding a hollow interior. The fibrous material has a moisture content such that the level of water ranges from 40-95% of the weight of the fibrous material and the water is positioned substantially within the hollow interior of the fibers and within the fiber walls of the fibers. A chemical is added to the fibrous material in a manner such that the chemical is disposed in the water present in the fibrous material. The fibrous material is then contacted with a gas which is reactive with the chemical to form a water insoluble chemical compound. The method provides a fibrous material having a chemical compound loaded within the hollow interiors and within the fiber walls of the plurality of fibers.

US Patent:

RE354600, Feb 25, 1997

Filed:

Oct 21, 1993

Appl. No.:

8/141181

Inventors:

John H. Klungness - Madison WI
Daniel F. Caulfield - Madison WI
Irving B. Sachs - Madison WI
Marguerite S. Sykes - Madison WI
Freya Tan - Madison WI
Richard W. Shilts - Stoughton WI

Assignee:

The United States of America as represented by the Secretary of
Agriculture - Washington DC

International Classification:

D21H 1116

US Classification:

162 9

Abstract:

The present invention relates to a method for loading a chemical compound within the fibers of a fibrous material and to the fibrous materials produced by the method. In the method, a fibrous cellulose material is provided which consists of a plurality of elongated fibers having a fiber wall surrounding a hollow interior. The fibrous material has a moisture content such that the level of water ranges from 40-95% of the weight of the fibrous material and the water is positioned substantially within the hollow interior of the fibers and within the fiber walls of the fibers. A chemical is added to the fibrous material in a manner such that the chemical is disposed in the water present in the fibrous material. The fibrous material is then contacted with a gas which is reactive with the chemical to form a water insoluble chemical compound. The method provides a fibrous material having a chemical compound loaded within the hollow interiors and within the fiber walls of the plurality of fibers.