Rajan R Iyer

US Patent:

7744688, Jun 29, 2010

Filed:

Dec 29, 2003

Appl. No.:

10/538012

Inventors:

David Skuse - Truro, GB
Mark Mortimer - Beverley, GB
Deb Thrale - Par, GB
Rajan R. Iyer - Watkinsville GA, US
Daniel J. Panfil - Milledgeville GA, US
Christopher Nutbeem - St. Austell, GB

Assignee:

Imerys Pigments, Inc. - Roswell GA

International Classification:

C09D 1/00
C04B 14/04
C09C 1/02
D21H 11/00
C01F 5/24

US Classification:

106464, 1062865, 106463, 106486, 1621818, 423430

Abstract:

The present disclosure relates to a coating composition for use in producing a coating on paper and other substrates comprising an aqueous suspension of a particulate pigment together with a binder, wherein the particulate pigment comprises a mixture of: a first pigment component comprising particulate ground calcium carbonate (GCC) having a particle size distribution (psd) steepness factor ranging from about 30 to about 45; and a second pigment component comprising particulate precipitated calcium carbonate (PCC) having a psd steepness factor ranging from about 55 to about 75. The particulate pigment may optionally further include a particulate kaolin clay.

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.