US4241142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clay pigment for coating paper
Assignee: BASF Catalysts LLC
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Filing: 1978-12-20
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Granted: 1980-12-23
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Expires: 1998-12-20
Abstract
Abstract A novel clay pigment, the manufacture thereof and the use of the pigment in the production of dull and matte-finish coated printing papers. The novel clay pigment comprises a mixture of a coarse-size fraction of naturally-occurring kaolin clay containing a substantial proportion of kaolinite booklets in the particle size range of 2 to 5 μm equivalent spherical diameter (e.s.d.) and mechanically delaminated kaolin platelets in the particle size range of 2 to 10 μm e.s.d.
Inventors
- 👤 Adam F. Kaliski
- 👤 Richard R. Berube
- 👤 John C. Nease
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:00
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/40; C09C1/42; D; D21; D21H; D21H19/00; D21H19/36; D21H19/38; D21H19/40; C01; C01P; C01P2004/00; C01P2004/20; C01P2004/51; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/10; C01P2006/22; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31971; Y10T428/31975
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
138 words
A method for producing matte-finish clay-coated printing paper which comprises forming an aqueous slurry of a pigment comprising a mixture of (a) a minor percentage of mechanically delaminated particles of kaolin clay which are larger than 2 μm and finer than 10 μm and (b) a major weight percentage of a coarse-size fraction of naturally-occurring kaolin clay which has not undergone delamination and wherein substantially all of the particles are finer than 10 μm, from 40% to 60% by weight are finer than 2 μm and the particles larger than 2 μm are composed of kaolinite stacks preponderantly in the size range of 2 μm to 5 μm, mixing said slurry with an aqueous paper coating adhesive to form a coating composition, applying the coating composition to paper and drying the paper thus coated without calendering the paper.
Claim 2
Independent Claim
138 words
A method for producing matte-finish clay-coated printing paper which comprises forming an aqueous slurry of a pigment comprising a mixture of (a) a minor percentage of mechanically delaminated particles of kaolin clay which are larger than 2 μm and finer than 10 μm and (b) a major weight percentage of a coarse-size fraction of naturally-occurring kaolin clay which has not undergone delamination and wherein substantially all of the particles are finer than 10 μm, from 40% to 60% by weight are finer than 2 μm and the particles larger than 2 μm are composed of kaolinite stacks preponderantly in the size range of 2 μm to 5 μm, mixing said slurry with an aqueous paper coating adhesive to form a coating composition, applying the coating composition to paper and drying the paper thus coated without calendering the paper.
Claim 3
Independent Claim
140 words
A method for producing dull-finish clay-coated printing paper which comprises forming an aqueous slurry of a pigment comprising a mixture of (a) a minor weight percentage of mechanically delaminated particles of kaolin clay which are larger than 2 μm and finer than 10 μm and (b) a major weight percentage of a coarse-size fraction of naturally-occurring kaolin clay which has not undergone delamination and wherein substantially all of the particles are finer than 10 μm, from 40% to 60% by weight are finer than 2 μm and the particles larger than 2 μm are composed of kaolinite stacks preponderantly in the size range of 2 μm to 5 μm, mixing said slurry with an aqueous paper coating adhesive to form a paper coating composition, applying the coating composition to paper, drying the paper thus coated and supercalendering the coated paper.
Claim 4
Independent Claim
140 words
A method for producing dull-finish clay-coated printing paper which comprises forming an aqueous slurry of a pigment comprising a mixture of (a) a minor weight percentage of mechanically delaminated particles of kaolin clay which are larger than 2 μm and finer than 10 μm and (b) a major weight percentage of a coarse-size fraction of naturally-occurring kaolin clay which has not undergone delamination and wherein substantially all of the particles are finer than 10 μm, from 40% to 60% by weight are finer than 2 μm and the particles larger than 2 μm are composed of kaolinite stacks preponderantly in the size range of 2 μm to 5 μm, mixing said slurry with an aqueous paper coating adhesive to form a paper coating composition, applying the coating composition to paper, drying the paper thus coated and supercalendering the coated paper.
Claim 5
Dependent Claim
131 words
A low gloss coated printing paper having improved optical and printing properties, said printing paper comprising paper and a smooth coating thereon of adhesive-bound clay particles, said clay particles comprising (a) from 5 to 30 parts by weight of mechanically delaminated particles of kaolin clay, the particles of which range in size from 2 μm to 10 μm and are predominantly in the size range of 2 μm to 5 μm and (b) from 95 to 70 parts by weight of a coarse particle-size fraction of kaolin clay which has not undergone mechanical delamination, said course-size fraction being essentially free from particles coarser than 10 μm and containing from about 88% to 94% by weight of particles finer than 5 μm and from about 40% to 60% finer than 2 μm.
Claim 6
Dependent Claim
131 words
A low gloss coated printing paper having improved optical and printing properties, said printing paper comprising paper and a smooth coating thereon of adhesive-bound clay particles, said clay particles comprising (a) from 5 to 30 parts by weight of mechanically delaminated particles of kaolin clay, the particles of which range in size from 2 μm to 10 μm and are predominantly in the size range of 2 μm to 5 μm and (b) from 95 to 70 parts by weight of a coarse particle-size fraction of kaolin clay which has not undergone mechanical delamination, said course-size fraction being essentially free from particles coarser than 10 μm and containing from about 88% to 94% by weight of particles finer than 5 μm and from about 40% to 60% finer than 2 μm.
Claim 7
Dependent Claim
25 words
The printing paper of claim 3 wherein said mixture of clay particles contains from 45% to 60% by weight of particles finer than 2 μm.
Claim 8
Dependent Claim
37 words
The printing paper of claim 3 wherein the delaminated clay component (a) has a particle size distribution in weight percent as follows: 90-100% finer than 10 μm; 60-90% finer than 5 μm; 0-25% finer than 2 μm.
Claim 9
Dependent Claim
37 words
The printing paper of claim 3 wherein the undelaminated clay component (b) has a particle size distribution in weight percent as follows: 98-100% finer than 10 μm; 89-92% finer than 5 μm; 45-60% finer than 2 μm.
Claim 10
Dependent Claim
45 words
The printing paper of claim 3 wherein the total mixture of kaolin clay particles has a particle size distribution in weight percent as follows: 96-100% finer than 10 μm; 88-92% finer than 5 μm; 45-60% finer than 2 μm; and 20-30% finer than 1 μm.
Claim 11
Dependent Claim
40 words
The printing paper of claim 3 wherein the total mixture of kaolin clay particles has a particle size distribution in weight percent as follows: 100% finer than 15 μm; 88% finer than 5 μm; and 52% finer than 2 μm.
Claim 12
Dependent Claim
19 words
The printing paper of claim 3 which has a gloss in the range of 0 to 15% (TAPPI, 75°).
Claim 13
Dependent Claim
11 words
The printing paper of claim 9 wherein said paper is uncalendered.
Claim 14
Dependent Claim
20 words
The printing paper of claim 3 which has a gloss in the range of about 20% to 35% (TAPPI, 75°).
Claim 15
Dependent Claim
11 words
The printing paper of claim 11 wherein said paper is calendered.
Claim 16
Dependent Claim
26 words
The printing paper of claim 3 wherein said aqueous paper coating adhesive is selected from known adhesives which minimize ink set-off in the coated printing paper.
Claim 17
Dependent Claim
28 words
The printing paper of claim 13 wherein said adhesive is selected from the group consisting of polyvinyl acetate latexes, styrene-butadiene latexes and mixtures thereof with starch or protein.
Claim 18
Dependent Claim
10 words
The printing paper of claim 3 further containing a starch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |