Duncan S Carr

US Patent:

7189776, Mar 13, 2007

Filed:

Jun 11, 2002

Appl. No.:

10/167355

Inventors:

Duncan Carr - Neenah WI, US
Michael Sigman - Appleton WI, US

Assignee:

Akzo Nobel N.V. - Arnhem

International Classification:

C08K 3/36
C08K 9/02
C08K 9/04
C04B 24/26

US Classification:

524493, 524 2, 524492, 523216

Abstract:

The present invention relates to an aqueous composition comprising anionic organic polymeric particles and colloidal anionic silica-based particles. The anionic organic polymeric particles are obtainable by polymerising one or more ethylenically unsaturated monomers together with one or more polyfunctional branching agents and/or polyfunctional crosslinking agents. The anionic organic polymeric particles and the colloidal anionic silica-based particles in the aqueous composition are present in an amount of at least 0. 01% by weight based on the total weight of the aqueous composition. The present invention further relates to a method for the preparation of the aqueous composition, uses of the aqueous composition and a process for the production or paper, in which the aqueous composition is added to a cellulosic suspension.

US Patent:

7691234, Apr 6, 2010

Filed:

Feb 21, 2006

Appl. No.:

11/358281

Inventors:

Duncan Carr - Neenah WI, US
Michael Sigman - Appleton WI, US

Assignee:

Akzo Nobel N.V. - Arnhem

International Classification:

D21H 11/00

US Classification:

1621816, 524493, 524789

Abstract:

The present invention relates to an aqueous composition comprising anionic organic polymeric particles and colloidal anionic silica-based particles. The anionic organic polymeric particles are obtainable by polymerizing one or more ethylenically unsaturated monomers together with one or more polyfunctional branching agents and/or polyfunctional crosslinking agents. The anionic organic polymeric particles and the colloidal anionic silica-based particles in the aqueous composition are present in an amount of at least 0. 01% by weight based on the total weight of the aqueous composition. The present invention further relates to a method for the preparation of the aqueous composition, uses of the aqueous composition and a process for the production or paper, in which the aqueous composition is added to a cellulosic suspension.

US Patent:

20040250972, Dec 16, 2004

Filed:

May 7, 2004

Appl. No.:

10/841262

Inventors:

Duncan Carr - Neenah WI, US

International Classification:

D21H021/10

US Classification:

162/164100, 162/175000, 162/181700, 162/168300

Abstract:

The invention relates to a process for the production of paper which comprises (i) providing a main aqueous flow containing cellulosic fibers; (i) introducing one or more retention components into the main aqueous flow to form a main aqueous flow containing one or more retention components; (iii) providing a diluting aqueous flow; (iv) introducing a low molecular weight cationic organic polymer into the diluting aqueous flow to form a diluting aqueous flow containing a low molecular weight cationic organic polymer, the low molecular weight cationic organic polymer having a weight average molecular weight up to 5,000,000; (v) introducing the diluting aqueous flow containing a low molecular weight cationic organic polymer into the main aqueous flow containing one or more retention components to form a resulting aqueous flow; and then (vi) ejecting the resulting aqueous flow onto a wire and dewatering the resulting aqueous flow to form a web of paper.