US4859246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of high molecular weight sulfonate as auxiliary dispersants for structured kaolins
Assignee: BASF Catalysts LLC
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Filing: 1988-09-12
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Granted: 1989-08-22
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Expires: 2008-09-12
Abstract
Abstract A bulked kaolin pigment is prepared by mixing a small but effective amount of a water-soluble cationic material such as a cationic polyelectrolyte flocculant with a kaolin clay pigment in the presence of water. The resultant bulked clay product can be dispersed to form high solids clay-water slurries useful in making aqueous coating colors suitable for manufacturing lightweight coated publication papers or the pigment can be used as a filler for paper webs. Slurries having stable viscosity during storage and at elevated temperature are prepared by using as the dispersant an anionic sulfonated disperant such as a lignosulfonate or a naphthalene formaldehyde sulfonate complex.
Inventors
- 👤 Paul Sennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:38
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/40; C09C1/42; C09C3/00; D; D21; D21H; D21H19/00; D21H19/36; D21H19/38; D21H19/40; C01; C01P; C01P2002/00; C01P2002/80; C01P2002/84; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/50; C01P2004/51; C01P2004/60; C01P2004/61; C01P2004/62; C01P2006/00; C01P2006/12; C01P2006/22; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
75 words
A heat stabilized fluid aqueous slurry comprising chemically bulked hydrous kaolin clay pigment particles obtained by adding a cationic organic polymeric material to hydrous kaolin clay in the presence of water to flocculate said clay and a dispersant effective amount of a combination of dispersants consisting essentially of a polyacrylate salt and a water soluble anionic sulfonate, said slurry having greater heat stability than it would have using said polyacrylate salt as the sole dispersant.
Claim 2
Dependent Claim
75 words
A heat stabilized fluid aqueous slurry comprising chemically bulked hydrous kaolin clay pigment particles obtained by adding a cationic organic polymeric material to hydrous kaolin clay in the presence of water to flocculate said clay and a dispersant effective amount of a combination of dispersants consisting essentially of a polyacrylate salt and a water soluble anionic sulfonate, said slurry having greater heat stability than it would have using said polyacrylate salt as the sole dispersant.
Claim 3
Dependent Claim
20 words
The slurry of claim 1 wherein said pigment is obtained by flocculating a suspension of kaolin with a cationic polyelectrlyte.
Claim 4
Dependent Claim
20 words
The slurry of claim 1 wherein said pigment is obtained by flocculating a suspension of kaolin clay with a polyamine.
Claim 5
Dependent Claim
14 words
The pigment of claim 2 wherein said slurry is at 60% solids or above.
Claim 6
Independent Claim
127 words
A method for preparing a heat stable aqueous slurry of a bulking pigment suitable for use in coating or filling paper which comprises preparing a fluid aqueous suspension of particles of kaolin clay, adding thereto a water-soluble cationic organic polyelectrolyte, the amount of said cationic polyelectrolyte being sufficient to substantially thicken and flocculate said clay suspension, acidifying said clay suspension, optionally bleaching the clay in said suspension with a hydrosulfite salt before or after said acidification, filtering said acidified suspension to recover bulked clay, washing the filtered clay and adding a dispersant effective amount of a dispersant consisting essentially of the combination of a polyacrylate salt and a water soluble anionic sulfonate to the recovered bulked clay to provide said heat stable fluid slurry of bulked clay.
Claim 7
Independent Claim
127 words
A method for preparing a heat stable aqueous slurry of a bulking pigment suitable for use in coating or filling paper which comprises preparing a fluid aqueous suspension of particles of kaolin clay, adding thereto a water-soluble cationic organic polyelectrolyte, the amount of said cationic polyelectrolyte being sufficient to substantially thicken and flocculate said clay suspension, acidifying said clay suspension, optionally bleaching the clay in said suspension with a hydrosulfite salt before or after said acidification, filtering said acidified suspension to recover bulked clay, washing the filtered clay and adding a dispersant effective amount of a dispersant consisting essentially of the combination of a polyacrylate salt and a water soluble anionic sulfonate to the recovered bulked clay to provide said heat stable fluid slurry of bulked clay.
Claim 8
Dependent Claim
12 words
The method of claim 5 wherein said anionic sulfonate is a lignosulfonate.
Claim 9
Dependent Claim
15 words
The method of claim 5 wherein said anionic sulfonate is a napthalene formaldehyde sulfonate complex.
Claim 10
Independent Claim
38 words
The method as claimed in claims 6 or 7 wherein said anionic sulfonate is present in an amount in the range of about 0.05 to 0.25 based on the dry weight of said clay including said cationic polyelectrolyte.
Claim 11
Dependent Claim
32 words
The method as claimed in claim 6 or 7 wherein said surfactant is present in amount in the range of about 0.1 to 15% based on said clay including said cationic polyelectrolyte.
Claim 12
Dependent Claim
91 words
In the preparation of a starch coating color suitable for application to paper wherein the pigment comprises kaolin clay previously bulked with a cationic organic agent and the coating color is prepared by cooking starch in the presence of a slurry comprising said bulked clay and a dispersant to form a fluid slurry, the improvement which comprises utilizes as said dispersant the combination consisting essentially of a polyacrylate salt and a water soluble anionic sulfonate in an amount effective to minimize the increase in viscosity when said coating color is cooked.
Claim 13
Dependent Claim
91 words
In the preparation of a starch coating color suitable for application to paper wherein the pigment comprises kaolin clay previously bulked with a cationic organic agent and the coating color is prepared by cooking starch in the presence of a slurry comprising said bulked clay and a dispersant to form a fluid slurry, the improvement which comprises utilizes as said dispersant the combination consisting essentially of a polyacrylate salt and a water soluble anionic sulfonate in an amount effective to minimize the increase in viscosity when said coating color is cooked.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |