Robert D Pruett

US Patent:

6402826, Jun 11, 2002

Filed:

Nov 30, 1999

Appl. No.:

09/451109

Inventors:

Jun Yuan - Millegeville GA
Christopher R. L. Golley - Sandersville GA
Christopher Nutbeem - Cornwall, GB
Rajan R. Iyer - Sandersville GA
William H. Pope - Sandersville GA
William L. Garforth - Sandersville GA
Anthony V. Lyons - Macon GA
Robert J. Pruett - Milledgeville GA

Assignee:

Imerys Pigments, Inc. - Roswell GA

International Classification:

C09C 142

US Classification:

106486, 106416, 106484, 1621818, 241 241, 241 16

Abstract:

A kaolin clay pigment comprises a coarse kaolin clay or a blend of a coarse kaolin clay with a fine kaolin clay. The coarse kaolin clay is a delaminated and defined pigment product with an overall shape factor greater than about 12. If the coarse kaolin clay is fluid at about 65% to about 75% solids, then it is used by itself as the kaolin pigment. If it is not fluid, it is blended with a fine kaolin clay in amounts ranging from about 0. 1% to about 30. 0% by weight of the blend. The coarse kaolin clay fraction has a Hinckley Crystallinity Index greater than about 0. 6 and the fine kaolin clay has a Hinckley Crystallinity Index less than about 0. 5. The pigment has a G. E. brightness of about 90. 5 and a particle size distribution such that at least about 90% by weight of the particles has an e. s. d. less than about 2 m and about 30% by weight of the particles has an e. s. d.

US Patent:

6468343, Oct 22, 2002

Filed:

Nov 21, 2000

Appl. No.:

09/717802

Inventors:

Robert J. Pruett - Milledgeville GA
David O. Cummings - Warthen GA
Anthony V. Lyons - Macon GA
Steven M. Fortier - Milledgeville GA
William L. Garforth - Sandersville GA
Daniel J. Panfil - Milledgeville GA
Jun Yuan - Milledgeville GA

Assignee:

Imerys Pigments, Inc. - GA

International Classification:

C04B 1410

US Classification:

106486, 106416, 106484

Abstract:

Paper coating composition comprising an engineered kaolin pigment containing stacks and platelets of unground coarse particles where greater than 96% by weight is less than 5 microns, of which some kaolinite books or stacks are concentrated in the greater than 1 micron size fraction; 88% to 95% by weight is less than 2 microns; 65% to 85% by weight is less than 1 micron; and 15% to 25% by weight is less than 0. 25 micron. A first embodiment comprises particles with a shape factor Ad between 7 and 9 which represents a significant number of stacks and some platelets. A second embodiment comprises particles with a shape factor of 11 or 12 which represents the presence of some stacks with a majority of platelets. The kaolin clay pigments form clay-water slurries of 69% solids or greater. As a coating, the composition gives a G. E.

US Patent:

6514333, Feb 4, 2003

Filed:

Nov 9, 2000

Appl. No.:

09/700027

Inventors:

Jun Yuan - Milledgeville GA
Vince H. Brown - Sandersville GA
Robert J. Pruett - Milledgeville GA
William L. Garforth - Sandersville GA

Assignee:

Imerys Pigments, Inc. - Rosewell GA

International Classification:

C04B 1404

US Classification:

106486, 106484

Abstract:

A novel clay pigment, the manufacture thereof and the use of the pigment in the coating of lightweight groundwood paper are disclosed. The kaolin clay particles initially have a shape factor between less than 10 and a particle size distribution where between 30 to 60% by weight is less than 2 microns and 20% by weight is less than 0. 25 micron e. s. d. This clay is subjected to attrition grinding to produce clay particles having a shape factor between 13 and 18 and then classified to produce a particle size distribution where 80 to 90% by weight are less than 2 microns and 20% by weight are less than 0. 25 micron. These pigments have a G. E. brightness ranging from 88 to 92; are deficient in ultra-fine particles; are fluid at a high solids concentration greater than 70%, and have a low shear Brookfield viscosity below 500 cps and a high shear Hercules viscosity of 18 dyne-cm above 200 rpm when using an âAâ bob.

US Patent:

6564199, May 13, 2003

Filed:

Dec 20, 2001

Appl. No.:

09/937671

Inventors:

Robert J. Pruett - Milledgeville GA
Jun Yuan - Milledgeville GA
David O. Cummings - Warthen GA

Assignee:

Imerys Pigments, Inc. - Roswell GA

International Classification:

C04B 1404

US Classification:

706486, 106416, 106484, 106487

Abstract:

A paper coating pigment manufactured from kaolin crude containing minor amounts of minerals is used in lightweight coated and ultra-lightweight coated applications. The pigments comprise a phyllosilicate assemblage of minerals that yield a final pigment MgO content ranging between 0. 04 to 0. 3 weight percent and a K O content ranging between 0. 12 and 0. 8 weight percent based on the dry weight of the kaolin crude. The mica in the pigment product is 1. 0% to 6. 7% by weight, and smectite is 1. 2% to 9. 1% by weight of the kaolin. The presence of these weight percentages can be identified by a shape factor of 15 or greater. The viscous clay content of the feed to produce the pigment product is between 70 and 100 weight percent based on the dry weight of the kaolin clay. The pigment has a shape factor ranging between 35 and 60 or greater, and greater than 80% by weight of the particle are less than 2 microns, and greater than 12% are less than 0. 25 microns.

US Patent:

7122080, Oct 17, 2006

Filed:

Aug 8, 2002

Appl. No.:

10/214359

Inventors:

Robert J. Pruett - Milledgeville GA, US
Jun Yuan - Warner Robins GA, US
Christopher R. L. Golley - Sandersville GA, US
Michael J. Garska - Sandersville GA, US

International Classification:

C04B 14/04

US Classification:

106487, 106486, 106488, 209 5, 209 7, 501148

Abstract:

The present invention provides an improved method of beneficiating and dewatering kaolin clays. The product of the improved process is a brightened, dewatered kaolin, suitable for use in pigments and paper coating compositions. The improved beneficiation process provides refined kaolin for pigments and other purposes of the same or better quality as prior art processes, but with the use of fewer steps and materials, at significant cost and environmental savings.

US Patent:

7208039, Apr 24, 2007

Filed:

Mar 23, 2005

Appl. No.:

11/086575

Inventors:

J. Philip E. Jones - Alpharetta GA, US
Robert J. Pruett - Milledgeville GA, US
Jun Yuan - Warner Robins GA, US
Michael J. Garska - Sandersville GA, US
David O. Cummings - Warthen GA, US
Bomi M. Bilimoria - Macon GA, US
Robin Wesley - Ruislip, GB

Assignee:

Imerys Pigments, Inc. - Roswell GA

International Classification:

C09C 1/00
C09C 1/34
C04B 14/04

US Classification:

106486, 106416, 106454

Abstract:

The present invention relates to a hydrous kaolin product having improved optical properties, for example, when used in the production of paper products. The present invention comprises an improved barrier coating for paper and a method of making the coated paper. The present invention also comprises an improved method from making filled and coated paper products. The present invention uses a composition comprising kaolin having a shape factor of at least about 70:1, such as at least about 80:1 or at least about 100:1.

US Patent:

7214264, May 8, 2007

Filed:

Apr 19, 2005

Appl. No.:

11/108878

Inventors:

J. Philip E. Jones - Alpharetta GA, US
Robert J. Pruett - Milledgeville GA, US
Jun Yuan - Warner Robins GA, US
Michael J. Garska - Sandersville GA, US
David O. Cummings - Warthen GA, US
Bomi M. Bilimoria - Macon GA, US
Robin Wesley - Ruislip, GB

Assignee:

Imerys Pigments, Inc. - Roswell GA

International Classification:

C04B 14/10
C09D 1/00

US Classification:

106486, 1062865, 10628717, 106442, 106445, 106446, 106484, 106487, 106811, 501141, 501145

Abstract:

The present invention relates to a hydrous kaolin product having improved optical properties, for example, when used in the production of paper products. The present invention comprises an improved barrier coating for paper and a method of making the coated paper. The present invention also comprises an improved method from making filled and coated paper products. The present invention uses a composition comprising kaolin having a shape factor of at least about 70:1, such as at least about 80:1 or at least about 100:1.

US Patent:

7226005, Jun 5, 2007

Filed:

Mar 23, 2005

Appl. No.:

11/086563

Inventors:

J. Philip E. Jones - Alpharetta GA, US
Robert J. Pruett - Milledgeville GA, US
Jun Yuan - Warner Robins GA, US
Michael J. Garska - Sandersville GA, US
David O. Cummings - Warthen GA, US
Bomi M. Bilimoria - Macon GA, US
Robin Wesley - Ruislip, GB

Assignee:

Imerys Pigments, Inc. - Roswell GA

International Classification:

B02C 19/00

US Classification:

241 21, 241 241, 241 29

Abstract:

The present invention relates to a hydrous kaolin product having improved optical properties, for example, when used in the production of paper products. The present invention comprises an improved barrier coating for paper and a method of making the coated paper. The present invention also comprises an improved method from making filled and coated paper products. The present invention uses a composition comprising kaolin having a shape factor of at least about 70:1, such as at least about 80:1 or at least about 100:1.