Ultrahigh brightness calcined clay pigment, manufacture & use thereof
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C04B-014/10
출원번호
US-0497241
(1995-06-30)
발명자
/ 주소
Forbus Ellen S. (Gray GA) Suitch Paul R. (Milledgeville GA) Dombrowski Thomas (Macon GA)
출원인 / 주소
Engelhard Corporation (Iselin NJ 02)
인용정보
피인용 횟수 :
35인용 특허 :
9
초록▼
A selected kaolin crude or crude fraction is purified by physical or physical/chemical means, such as froth flotation and/or selective flocculation, to remove discrete particles of TiO2 and in some cases, discrete iron minerals. The pure (or purified clay) must then be agitated in the presence of wa
A selected kaolin crude or crude fraction is purified by physical or physical/chemical means, such as froth flotation and/or selective flocculation, to remove discrete particles of TiO2 and in some cases, discrete iron minerals. The pure (or purified clay) must then be agitated in the presence of water with a particulate grinding media such as, for example, sand, alumina or zirconia beads, to increase the 2 micron content of the kaolin. An intermediate ground product that contains a substantial weight percentage of particles finer than 1 micron is generated as a result of grinding. The particles finer than 1 micron in the ground kaolin also include those particles in the previously pure or purified kaolin that were present in the naturally occurring clay. A pulp of the ground clay is then fractionated to remove particles larger than 2 microns, e.g., to remove at least 95%, preferably at 100% by weight, of the particles larger than 2 microns, while minimizing the removal of particles finer than 1 micron. The resulting fine particles size fraction is then treated by conventional series of steps, i.e., optional bleaching, drying, pulverization, calcination and repulverization to produce a low abrasion, ultrahigh brightness (typically 96%) calcined kaolin pigment.
대표청구항▼
An improved process for producing an ultra high brightness, low abrasion kaolin clay pigment from a soft kaolin clay crude which comprises: a) selecting a crude that contains less than 2.0% by weight of quartz, mica and smectite minerals in the minus 2 micron fraction, removing grit from said crude
An improved process for producing an ultra high brightness, low abrasion kaolin clay pigment from a soft kaolin clay crude which comprises: a) selecting a crude that contains less than 2.0% by weight of quartz, mica and smectite minerals in the minus 2 micron fraction, removing grit from said crude and recovering degritted unfractionated crude that is from about 50-65% by weight finer than 2 microns, e.s.d.; b) subjecting the degritted unfractionated crude to froth flotation, selective flocculation or combinations thereof to remove colored titania and optionally ferruginous impurities and produce a purified unfractionated kaolin product containing from 0-1.8% TiO2 and 0-0.8% Fe2O3; c) agitating the product of step (b) with particulate grinding media until about 85-92% by weight is finer than 2 microns e.s.d.; d) removing sufficient kaolin particles from the product of step (c) to produce calciner feed that is about 95-100% by weight finer than 2 microns and about 88-92% by weight finer than 1 micron and represents at least 40% by weight of the degritted kaolin; recovering a resulting fractionated product; e) spray drying the resulting recovered fractionated product from step (d) and pulverizing, fully calcining and repulverizing the spray dried product in a conventional manner; f) and recovering the calcined product having a G.E. brightness of at least 95%, an Einlehner abrasion below 25 and a white color as measured by an L value greater than 98.
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이 특허에 인용된 특허 (9)
McConnell, Anthony D.; Garner, Robert H., Anhydrous kaolin clay pigment and method of preparation.
Berube Richard R. (Holmdel NJ) Babiec ; Jr. John S. (Berwyn PA) Jameson M. Phillip (Sommerville NJ) Negele Andrew R. (Edison NJ) Willis Mitchell J. (Macon GA), Calcined kaolin clay filler pigment for enhancing opacity and printing properties of newsprint and mechanical papers.
Slepetys Richard A. (Brick NJ) Jameson M. Phillip (Somerville NJ), Metakaolin pigment with high brightness and low abrasion and manufacture thereof from soft kaolin clays.
Pope William H. (Sandersville GA) Ginn Michael W. (Wrightsville GA) McNeely R. Brock (Davisboro GA), Method for producing high opacifying kaolin pigment.
Suitch Paul (Milledgeville GA) Turner ; Jr. Ralph E. (Tennille GA) Archer Dona L. (Sandersville GA) Smith William B. (Sandersville GA), Method for producing high opacifying kaolin pigment.
Pratt Richard J. (Thornton NH) Slepetys Richard A. (Brick Township ; Ocean County NJ) Nemeh Saad (West Long Branch NJ) Willis Mitchell J. (Macon GA), Treatment of clays with cationic polymers to prepare high bulking pigments.
Manasso, John A.; Bilimoria, Bomi M.; McLain, Leslie A.; Constantin, Milton, Compositions and methods for making a coarse platey, high brightness kaolin product.
Pruett Robert J. ; Lyons Anthony V. ; Cummings David O. ; Fortier Steven M. ; Garforth William L. ; Yuan Jun ; Panfil Daniel J., Engineered kaolin pigment composition for paper coating.
Robert J. Pruett ; David O. Cummings ; Anthony V. Lyons ; Steven M. Fortier ; William L. Garforth ; Daniel J. Panfil ; Jun Yuan, Engineered kaolin pigment composition for paper coating.
Jones,J. Philip E.; Pruett,Robert J.; Yuan,Jun; Garska,Michael J.; Cummings,David O.; Bilimoria,Bomi M.; Wesley,Robin, Hyperplaty clays and their use in paper coating and filling, methods for making same, and paper products having improved brightness.
Jones,J. Philip E.; Pruett,Robert J.; Yuan,Jun; Garska,Michael J.; Cummings,David O.; Bilimoria,Bomi M.; Wesley,Robin, Hyperplaty clays and their use in paper coating and filling, methods for making same, and paper products having improved brightness.
Jones,J. Philip E.; Pruett,Robert J.; Yuan,Jun; Garska,Michael J.; Cummings,David O.; Bilimoria,Bomi M.; Wesley,Robin, Hyperplaty clays and their use in paper coating and filling, methods for making same, and paper products having improved brightness.
Pring,Graham; Golley,Christopher R. L., Kaolin pigment having high brightness and narrow particle size distribution and method of preparation therefor.
Clarey Mark ; Edwards James ; Tsipursky Semeon J. ; Beall Gary W. ; Eisenhour Don D., Method of manufacturing polymer-grade clay for use in nanocomposites.
Tsipursky Semeon J. ; Eisenhour Don D. ; Beall Gary W. ; Mosiewicz Marek R., Process for purifying clay by the hydrothermal conversion of silica impurities to a dioctahedral or trioctahedral smectite clay.
Patel, Navin; Mathur, Sharad; Khokhani, Ashok; Folmar, Kenneth W, Ultrafine hydrous kaolin pigments, methods of making the pigments, and methods of using the pigments in gloss paint formulations.
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