US4767466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bulking pigments
Assignee: BASF Catalysts LLC
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Filing: 1986-09-16
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Granted: 1988-08-30
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Expires: 2006-09-16
Abstract
Abstract 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 polyelectrolyte, the amount of said cationic polyelectrolyte being sufficient to substantially thicken and flocculate said fluid suspension, acidifying the resulting flocculate clay suspension, bleaching the clay in said suspension with a hydrosulfite salt, filtering said acidified suspension to recover bulked clay, washing the filtered clay and adding minimal amounts of a sodium polyacrylate and a nonionic surfactant to the recovered bulked clay to provide a fluid suspension of bulked clay.
Inventors
- 👤 Saad Nemeh
- 👤 Richard A. Slepetys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:43
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/69; C; C09; C09D; C09D17/00; C09D17/004; D21H19/00; D21H19/36; D21H19/38; D21H19/40
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
108 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 polyelectrolyte, the amount of said cationic polyelectrolyte being sufficient to substantially thicken and flocculate said fluid suspension, acidifying the resulting flocculated clay suspension, bleaching the clay in said suspension with a hydrosulfite salt, filtering said acidified suspension to recover bulked clay, washing the filtered clay and adding minimal amounts of a sodium polyacrylate and a nonionic surfactant to the recovered bulked clay to provide a fluid suspension of bulked clay.
Claim 2
Independent Claim
108 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 polyelectrolyte, the amount of said cationic polyelectrolyte being sufficient to substantially thicken and flocculate said fluid suspension, acidifying the resulting flocculated clay suspension, bleaching the clay in said suspension with a hydrosulfite salt, filtering said acidified suspension to recover bulked clay, washing the filtered clay and adding minimal amounts of a sodium polyacrylate and a nonionic surfactant to the recovered bulked clay to provide a fluid suspension of bulked clay.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein said nonionic surfactant is compatible with water and oil and has an HLB value in the range of 3 to 18.
Claim 4
Dependent Claim
21 words
The method as claimed in claim 1 wherein said surfactant has an HLB value in the range of 5 to 14.
Claim 5
Dependent Claim
26 words
The method as claimed in claim 1 wherein said surfactant is present in an effective amount up to 0.3 wt.% of the weight of said clay.
Claim 6
Dependent Claim
28 words
The method as claimed in claim 1 wherein said surfactant is present in an effective amount of up to 0.15% wt. of the total weight of said clay.
Claim 7
Dependent Claim
35 words
The product as claimed in claim 1 wherein said surfactant is decyloxy poly (ethyleneoxy) ethanol having the general formula: C.sub.10 H.sub.21 O(C.sub.2 H.sub.4 O)nCH.sub.2 CH.sub.2 OH wherein n is an integer of 6 to 8.
Claim 8
Dependent Claim
34 words
The method as claimed in claim 1 wherein said surfactant is decyloxypoly (ethyleneoxy) ethanol having the general formula: C.sub.10 H.sub.21 O(C.sub.2 H.sub.4 O)nCH.sub.2 CH.sub.2 OH wherein n is an integer of 6 to 8.
Claim 9
Dependent Claim
12 words
The product of claim 1 wherein such surfactant is nonylphenoxypoly (ethyleneoxy) ethanol.
Claim 10
Dependent Claim
14 words
The method as claimed in claim 1 wherein said surfactant is nonylphenoxypoly (ethyleneoxy) ethanol.
Claim 11
Independent Claim
98 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 polyelectrolyte, the amount of said cationic polyelectrolyte being sufficient to substantially thicken and flocculate said fluid suspension, acidifying the resulting flocculated clay suspension, filtering said acidified suspension to recover bulked clay, washing the filtered clay and adding minimal amounts of a sodium polyacrylate and a nonionic surfactant to the recovered bulked clay to provide a fluid suspension of bulked clay.
Claim 12
Independent Claim
98 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 polyelectrolyte, the amount of said cationic polyelectrolyte being sufficient to substantially thicken and flocculate said fluid suspension, acidifying the resulting flocculated clay suspension, filtering said acidified suspension to recover bulked clay, washing the filtered clay and adding minimal amounts of a sodium polyacrylate and a nonionic surfactant to the recovered bulked clay to provide a fluid suspension of bulked clay.
Claim 13
Dependent Claim
27 words
The method of claim 10 wherein said nonionic surfactant is comptible with water and oil and has an HLB value in the range of 3 to 18.
Claim 14
Dependent Claim
21 words
The method as claimed in claim 10 wherein said surfactant has an HLB value in the range of 5 to 14.
Claim 15
Dependent Claim
25 words
The method as claimed in claim 10 wherein said surfactant is present in an effective amount up to 0.3 wt.% of the weight said clay.
Claim 16
Dependent Claim
28 words
The method as claimed in claim 10 wherein said surfactant is present in an effective amount of up to 0.15% wt. of the total weight of said clay.
Claim 17
Dependent Claim
35 words
The product as claimed in claim 10 wherein said surfactant is decyloxy poly (ethyeneoxy) ethanol having the general formula: C.sub.10 H.sub.21 O(C.sub.2 H.sub.4 O)nCH.sub.2 CH.sub.2 OH wherein n is an integer of 6 to 8.
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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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |