US4818294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kaolinite aggregation using organo-silicon compounds
Assignee: ECC America Inc
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Filing: 1987-06-26
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Granted: 1989-04-04
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Expires: 2007-06-26
Abstract
Abstract A particulate kaolin pigment which enhances gloss and printability properties when used as a coating pigment for paper and enhances light scattering and opacifying properties when incorporated as a filler in paper, is obtained by mixing a fine particle kaolin with an aggregating agent comprising an organic silicon compound such as tetramethoxy silane or tetraethoxy silane.
Inventors
- 👤 Rasik H. Raythatha
- 👤 Joshua O. Brannen, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:46
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/40; C09C1/42; D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/13; D21H19/00; D21H19/36; D21H19/38; D21H19/42; C01; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/50; C01P2004/51; C01P2004/52; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/14; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
111 words
A method for producing a kaolin pigment providing enhanced optical and printability properties when used in paper manufacture, which comprises mixing kaolin particles having a moisture content in the range of 1 to 2% by weight with an aggregating agent comprising an organic silicon compound selected from the group consisting of symmetric compounds having the formula ##STR3## where R═CH 3 , C 2 H 5 , C 3 H 7 , n--C 4 H 9 , sec-C 4 H 9 and C 6 H 5 and asymmetric compounds having the formula ##STR4## where R=C 2 H 5 , X=Cl or Br, and R'=H, ,and recovering an aggregated particular kaolin pigment product.
Claim 2
Independent Claim
111 words
A method for producing a kaolin pigment providing enhanced optical and printability properties when used in paper manufacture, which comprises mixing kaolin particles having a moisture content in the range of 1 to 2% by weight with an aggregating agent comprising an organic silicon compound selected from the group consisting of symmetric compounds having the formula ##STR3## where R═CH 3 , C 2 H 5 , C 3 H 7 , n--C 4 H 9 , sec-C 4 H 9 and C 6 H 5 and asymmetric compounds having the formula ##STR4## where R=C 2 H 5 , X=Cl or Br, and R'=H, ,and recovering an aggregated particular kaolin pigment product.
Claim 3
Dependent Claim
22 words
The method according to claim 1 in which the feed moisture content is in the range of 1.0 to 1.75% by weight.
Claim 4
Dependent Claim
22 words
The method according to claim 1 in which the feed moisture content is in the range of 1.5 to 1.75% by weight.
Claim 5
Dependent Claim
19 words
The method according to claim 1 in which the organic silicon compound comprises four hydrolyzable groups linked to silicon.
Claim 6
Dependent Claim
18 words
The method according to claim 1 in which the organic silicon compound is hydrolyzable to give liquid byproducts.
Claim 7
Dependent Claim
28 words
The method according to claim 1 in which the organic silicon compound is a silane having the formula (RO) 4 Si in which R is an alkyl group.
Claim 8
Dependent Claim
32 words
The method according to claim 6 in which R is an alkyl group of 1 to 4 carbon atoms and the R groups in the silane can be the same or different.
Claim 9
Dependent Claim
23 words
The method according to claim 7 in which the silane is selected from the group consisting of tetramethoxysilane and tetraethoxysilane and mixtures thereof.
Claim 10
Dependent Claim
32 words
The method according to claim 1 in which the kaolin particles are additionally mixed with an aggregation enhancing agent selected from the group consisting of alkaline earth metal salts and lithium chloride.
Claim 11
Dependent Claim
22 words
The method according to claim 9 in which the aggregation enhancing agent comprises a soluble salt of an alkaline earth metal ion.
Claim 12
Dependent Claim
15 words
The method according to claim 10 in which the aggregation enhancing agent comprises calcium chloride.
Claim 13
Dependent Claim
17 words
The method according to claim 1 in which the treatment with the organic silicon compound is repeated.
Claim 14
Dependent Claim
19 words
The method according to claim 1 in which the product is dried to shorten the time required for aggregation.
Claim 15
Dependent Claim
32 words
The method according to claim 1 in which the amount of the organic silicon compound is in the range of 0.1 to 3.0% by weight of the kaolin on a dry basis.
Claim 16
Dependent Claim
32 words
The method according to claim 14 in which the amount of the organic silicon compound is in the range of 0.2 to 2.0% by weight of the kaolin on a dry basis.
Claim 17
Dependent Claim
32 words
The method according to claim 13 in which the amount of the aggregation enhancing agent is in the range of 0.05% to 3.0% by weight of the kaolin on a dry basis.
Claim 18
Dependent Claim
19 words
The method according to claim 1 in which the treated kaolin is further treated by being exposed to ammonia.
Claim 19
Dependent Claim
29 words
The method according to claim 1 in which the feed kaolin comprises an air classified fine kaolin in which 80% of the particles are finer than 2 micrometers E.S.D.
Claim 20
Dependent Claim
20 words
The method according to claim 1 in which 96% of the feed kaolin particles are finer than 2 micrometers E.S.D.
Claim 21
Dependent Claim
16 words
The method according to claim 1 in which the kaolin particles are mixed with calcium carbonate.
Claim 22
Dependent Claim
32 words
The method according to claim 1 in which the feed kaolin moisture content is such that the molar ratio of water to aggregating agent is in the range of 2 to 50.
Claim 23
Dependent Claim
14 words
The method according to claim 21 in which the range is 4 to 20.
Claim 24
Dependent Claim
86 words
An aggregated particular kaolin pigment useful in paper coating and as a filler for paper which comprises kaolin particles that have been mixed with an organic silicon compound selected from the group consisting of symmetric compounds having the formula ##STR5## where R=CH 3 , C 2 H 5 , C 3 H 7 , n--C 4 H 9 , sec-C 4 H 9 and C 6 H 5 and asymmetric compounds having the formula ##STR6## where R=C 2 H 5 , X=Cl or Br, and R'=H.
Claim 25
Dependent Claim
86 words
An aggregated particular kaolin pigment useful in paper coating and as a filler for paper which comprises kaolin particles that have been mixed with an organic silicon compound selected from the group consisting of symmetric compounds having the formula ##STR5## where R=CH 3 , C 2 H 5 , C 3 H 7 , n--C 4 H 9 , sec-C 4 H 9 and C 6 H 5 and asymmetric compounds having the formula ##STR6## where R=C 2 H 5 , X=Cl or Br, and R'=H.
Claim 26
Dependent Claim
41 words
A pigment according to claim 23 in which the organic silicon compound has the formula (RO) 4 Si in which R is an alkyl group of 1 to 4 carbon atoms and the R groups may be the same or different.
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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) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |