Sharad Mathur

Author:

Sharad C. Mathur

ISBN #:

0721690041

US Patent:

6346145, Feb 12, 2002

Filed:

Aug 2, 2000

Appl. No.:

09/631008

Inventors:

John Hen - Macon GA
Ray Young - Macon GA
Andres Ginez - Dayton NJ
Sharad Mathur - Macon GA

Assignee:

Engelhard Corporation - Iselin NJ

International Classification:

C09C 142

US Classification:

106486, 106468, 501146, 501147

Abstract:

Flux calcined kaolin clay especially useful as a pigment for low sheen paints is obtained by mixing hydrous kaolin with an aqueous solution of alkaline flux, spray drying, pulverizing, calcining and repulverizing.

US Patent:

6378703, Apr 30, 2002

Filed:

Nov 30, 2000

Appl. No.:

09/727322

Inventors:

Sharad Mathur - Macon GA
Ronnie E. Brooks - Gordon GA
Ernest M. Finch - Macon GA

Assignee:

Engelhard Corporation - Iselin NJ

International Classification:

B03D 102

US Classification:

209166, 106486, 501148

Abstract:

An improved method for purifying titania contaminated kaolin clay by froth flotation which features the use an hydroxamate flotation collector at a neutral or mildly alkaline pH wherein a slurry of the impure clay is conditioned for the flotation step in a baffled conditioning apparatus provided with mean for imparting sufficient mechanical energy to heat a dispersed slurry of the impure clay before flotation.

US Patent:

6811600, Nov 2, 2004

Filed:

Jan 23, 2003

Appl. No.:

10/350370

Inventors:

Sharad Mathur - Macon GA
Richard R. Berube - Holmdel NJ

Assignee:

Engelhard Corporation - Iselin NJ

International Classification:

C04B 1426

US Classification:

106486, 106484, 106487, 106488, 106464, 106465

Abstract:

In a process for preparing a white pigment mixture suitable for coating paper wherein a cationically bulked kaolin clay pigment is dispersed in water in the presence of an anionic dispersant and mixed with a calcium carbonate pigment, the improvement which comprises using an epichlorohydrin amine complex to bulk said kaolin, and employing as the dispersant the combination of at least 0. 2% based on the dry weight of said cationically bulked kaolin of a condensed naphthalene sulfonate complex having a molecular weight of 2000 to 10,000 and a sodium polyacrylate salt having a molecular weight of 2000 to 5000, said dispersant being free from lignosulfonate.

US Patent:

7494541, Feb 24, 2009

Filed:

Jul 7, 2004

Appl. No.:

10/885947

Inventors:

Sharad Mathur - Macon GA, US
Kenneth W. Folmar - Macon GA, US
David Kirk Thompson - Milledgeville GA, US
Barry L. Daniels - McIntyre GA, US

Assignee:

BASF Corporation - Florham Park NJ

International Classification:

C04B 14/04

US Classification:

106484, 106486, 106487, 209 5, 241 241

Abstract:

Disclosed are methods of processing kaolin to produce two distinct grades of kaolin in a simultaneous manner. The methods involve processing kaolin by degritting a kaolin crude; subjecting the degritted kaolin crude to flotation to provide a kaolin having reduced titania content; ozonating the kaolin having reduced titania content; centrifuging the kaolin to provide a coarse stream and fine stream; refining the coarse stream into a coarse engineered kaolin pigment; and refining the fine stream into a fine glossing kaolin pigment. Also disclosed are systems for the automated processing of kaolin to produce two distinct grades of kaolin with real time feedback.

US Patent:

7902117, Mar 8, 2011

Filed:

Dec 1, 2005

Appl. No.:

11/291224

Inventors:

Sharad Mathur - Macon GA, US
Ivan Petrovic - Princeton NJ, US
David Lewis - Appleton WI, US
Xiaolin D. Yang - Edison NJ, US
Ernest M. Finch - Hopewell Junction NY, US

International Classification:

B41M 5/20
B41M 5/24

US Classification:

503200

Abstract:

The present invention provides a thermal paper composite precursor comprising (a) a substrate layer; and (b) a base layer positioned on the substrate layer, the base layer comprising a binder and at least one porosity improver wherein the thermal paper composite precursor has a thermal effusivity that is at least about 2% less than the thermal effusivity of porosity improver-less thermal paper composite precursor. The thermal paper composite precursor is useful in making thermal paper composite.

US Patent:

8557037, Oct 15, 2013

Filed:

Aug 26, 2004

Appl. No.:

10/926752

Inventors:

Navin Patel - Bridgewater NJ, US
Sharad Mathur - Macon GA, US
Ashok Khokhani - Manalapan NJ, US
Kenneth W Folmar - Macon GA, US

Assignee:

BASF Corporation - Florham Park NJ

International Classification:

C09C 1/42

US Classification:

106486, 106402

Abstract:

Disclosed are methods of processing kaolin to produce ultrafine hydrous kaolin. The methods involve processing gray crude kaolin by subjecting the kaolin crude to flotation and then centrifuging the kaolin to provide a fine stream that is subject to refinement. Also disclosed are systems for the automated processing of gray crude kaolin to produce the ultrafine hydrous kaolin and paint compositions that contain the ultrafine hydrous kaolin.

US Patent:

8642182, Feb 4, 2014

Filed:

Jul 28, 2010

Appl. No.:

13/124341

Inventors:

Sharad Mathur - Tega Cay SC, US
David Abundis - Charlotte NC, US
Randall Furtick - Charlotte NC, US

Assignee:

BASF Corporation - Florham Park NJ

International Classification:

B32B 23/04

US Classification:

428532, 4285375

Abstract:

This invention is directed to a paper coating or binding formulation, comprising an aqueous emulsion which comprises a copolymer derived from one or more monomers, and an ultra fine kaolin pigment. In certain embodiments, this invention is directed to a blend of high T9 latex (substantially non-film forming) and ultrafine kaolin. This invention is also directed to a paper comprising a fiber matrix and a coating or binding composition comprising an aqueous emulsion which comprises a copolymer deviced from one or more monomers, and an ultrafine kaolin pigment.

US Patent:

20010013302, Aug 16, 2001

Filed:

Feb 20, 2001

Appl. No.:

09/789155

Inventors:

Sharad Mathur - Macon GA, US
Karen Gruber - Hamilton NJ, US
Harry Reid - Macon GA, US

International Classification:

C04B014/04

US Classification:

106/484000

Abstract:

In one embodiment, the present invention relates to a method of making a highly reactive pozzolan, involving the steps of forming a slurry comprising metakaolin and a liquid; wet milling the slurry; and separating the metakaolin from the liquid to provide the highly reactive pozolan. In another embodiment, the present invention relates to a method of making a cement-based composition involving the steps of providing a highly reactive pozzolan by forming a slurry comprising metakaolin and a liquid, wet milling the slurry, and separating the metakaolin from the liquid; and combining the highly reactive pozzolan with at least one cementitious material.