US4159312A
Expired / Lapsed
US
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Calcium carbonate powders
Assignee: Shiraishi Kogyo Kaisha Ltd
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Filing: 1978-06-02
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Granted: 1979-06-26
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Expires: 1998-06-02
Abstract
Abstract Surface-treated calcium carbonate powders of this invention are easy to handle and highly dispersible in water, give slurries of high concentration and are useful as pigments and various other applications.
Inventors
- 👤 Hiroji Shibazaki
- 👤 Setsuji Edagawa
- 👤 Hisashi Hasegawa
- 👤 Satoshi Kondo
- 👤 Kazuo Ohnawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:08
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/18; C01F11/185; C09; C09C; C09C1/00; C09C1/02; C09C1/021; C09C3/00; C09C3/10; C09D; C09D17/00; C09D17/004; D; D21; D21H; D21H19/00; D21H19/36; D21H19/38; D21H19/385; D21H19/44; D21H19/56; D21H19/58; D21H21/00; D21H21/50; D21H21/52; C01P; C01P2004/00; C01P2004/30; C01P2004/38; C01P2004/60; C01P2004/62; C01P2006/00; C01P2006/22
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
76 words
A calcium carbonate powder composition comprising: (i) 100 parts by weight of cubic calcium carbonate particles 0.1 to 0.3 μm in average size, and (ii) 0.1 to 3.0 parts by weight of a substance comprising at least one water-soluble salt of a copolymer of 100 moles of isobutylene and 80 to 150 moles of maleic anhydride, the water-soluble salt having been adsorbed by the calcium carbonate particles and having a molecular weight of 10,000 to 30,000.
Claim 2
Dependent Claim
76 words
A calcium carbonate powder composition comprising: (i) 100 parts by weight of cubic calcium carbonate particles 0.1 to 0.3 μm in average size, and (ii) 0.1 to 3.0 parts by weight of a substance comprising at least one water-soluble salt of a copolymer of 100 moles of isobutylene and 80 to 150 moles of maleic anhydride, the water-soluble salt having been adsorbed by the calcium carbonate particles and having a molecular weight of 10,000 to 30,000.
Claim 3
Dependent Claim
81 words
A calcium carbonate powder composition as defined in claim 1 comprising: (i) 100 parts by weight of cubic calcium carbonate particles 0.1 to 0.3 μm in average size, and (ii) 0.1 to 1.0 part by weight of a substance comprising at least one water-soluble salt of a copolymer of 100 moles of isobutylene and 100 to 120 moles of maleic anhydride, the water-soluble salt having been adsorbed by the calcium carbonate particles and having a molecular weight of 15,000 to 20,000.
Claim 4
Dependent Claim
101 words
A process for preparing a calcium carbonate powder composition comprising adsorbing on an aqueous suspension containing 100 parts by weight of cubic calcium carbonate particles 0.1 to 0.3 μm in average size, 0.1 to 3.0 parts by weight of a substance comprising at least one water soluble salt of a copolymer of 100 moles of isobutylene and 80 to 150 moles of maleic anhydride per 100 parts by weight of the calcium carbonate, the water soluble salt having a molecular weight of 10,000 to 30,000, dewatering the mixture, drying the dewatered mixture, pulverizing the dried mixture and classifying the pulverized mixture.
Claim 5
Dependent Claim
101 words
A process for preparing a calcium carbonate powder composition comprising adsorbing on an aqueous suspension containing 100 parts by weight of cubic calcium carbonate particles 0.1 to 0.3 μm in average size, 0.1 to 3.0 parts by weight of a substance comprising at least one water soluble salt of a copolymer of 100 moles of isobutylene and 80 to 150 moles of maleic anhydride per 100 parts by weight of the calcium carbonate, the water soluble salt having a molecular weight of 10,000 to 30,000, dewatering the mixture, drying the dewatered mixture, pulverizing the dried mixture and classifying the pulverized mixture.
Claim 6
Dependent Claim
43 words
A process for preparing a calcium carbonate powder composition as defined in claim 3 wherein said substance is about 1.2 to 1.7 times the amount to be adsorbed by the calcium carbonate powder eventually obtained, based on the weight of the calcium carbonate.
Claim 7
Dependent Claim
125 words
A calcium carbonate powder composition comprising: (i) 100 parts by weight of cubic calcium carbonate particles 0.1 to 0.3 μm in average size, (ii) 0.1 to 3.0 parts by weight of a substance comprising at least one water-soluble salt of a copolymer of 100 moles of isobutylene and 80 to 150 moles of maleic anhydride, the water-soluble salt having a molecular weight of 10,000 to 30,000, and (iii) 0.3 to 5.0 parts by weight of a material comprising at least one water-soluble salt of a copolymer of 100 moles of acrylic acid and 5 to 200 moles of maleic acid, the water-soluble salt having a molecular weight of 1000 to 20,000, the water-soluble salts (i) and (ii) having been adsorbed by the calcium carbonate particles.
Claim 8
Dependent Claim
125 words
A calcium carbonate powder composition comprising: (i) 100 parts by weight of cubic calcium carbonate particles 0.1 to 0.3 μm in average size, (ii) 0.1 to 3.0 parts by weight of a substance comprising at least one water-soluble salt of a copolymer of 100 moles of isobutylene and 80 to 150 moles of maleic anhydride, the water-soluble salt having a molecular weight of 10,000 to 30,000, and (iii) 0.3 to 5.0 parts by weight of a material comprising at least one water-soluble salt of a copolymer of 100 moles of acrylic acid and 5 to 200 moles of maleic acid, the water-soluble salt having a molecular weight of 1000 to 20,000, the water-soluble salts (i) and (ii) having been adsorbed by the calcium carbonate particles.
Claim 9
Dependent Claim
130 words
A calcium carbonate powder composition as defined in claim 5 comprising: (i) 100 parts by weight of cubic calcium carbonate particles 0.1 to 0.3 μm in average size, (ii) 0.1 to 1.0 part by weight of a substance comprising at least one water-soluble salt of a copolymer of 100 moles of isobutylene and 100 to 120 moles of maleic anhydride, the water-soluble salt having a molecular weight of 15,000 to 20,000, and (iii) 0.5 to 1.5 parts by weight of a material comprising at least one water-soluble salt of a copolymer of 100 moles of acrylic acid and 30 to 100 moles of maleic acid, the water-soluble salt having a molecular weight of 2,000 to 5,000, the water-soluble salts (i) and (ii) having been adsorbed by the calcium carbonate particles.
Claim 10
Dependent Claim
148 words
A process for preparing a calcium carbonate powder composition comprising adsorbing on an aqueous suspension containing 100 parts by weight of cubic calcium carbonate particles 0.1 to 0.3 μm in average size (i) 0.1 to 3.0 parts by weight of a substance comprising at least one water soluble salt of a copolymer of 100 moles of isobutylene and 80 to 150 moles of maleic anhydride per 100 parts by weight of the calcium carbonate, the water soluble salt having a molecular weight of 10,000 to 30,000 and (ii) at least one water soluble salt of a copolymer of 100 moles of acrylic acid and 5 to 200 moles of maleic acid per 100 parts by weight of the calcium carbonate, the water soluble said having a molecular weight of 1000 to 20,000, dewatering the mixture, drying the dewatered mixture, pulverizing the dried mixture and classifying the pulverized mixture.
Claim 11
Dependent Claim
148 words
A process for preparing a calcium carbonate powder composition comprising adsorbing on an aqueous suspension containing 100 parts by weight of cubic calcium carbonate particles 0.1 to 0.3 μm in average size (i) 0.1 to 3.0 parts by weight of a substance comprising at least one water soluble salt of a copolymer of 100 moles of isobutylene and 80 to 150 moles of maleic anhydride per 100 parts by weight of the calcium carbonate, the water soluble salt having a molecular weight of 10,000 to 30,000 and (ii) at least one water soluble salt of a copolymer of 100 moles of acrylic acid and 5 to 200 moles of maleic acid per 100 parts by weight of the calcium carbonate, the water soluble said having a molecular weight of 1000 to 20,000, dewatering the mixture, drying the dewatered mixture, pulverizing the dried mixture and classifying the pulverized mixture.
Claim 12
Dependent Claim
60 words
A process for preparing a calcium carbonate powder composition as defined in claim 7 wherein the water-soluble salt of isobutylene-maleic anhydride copolymer and the water-soluble salt of acrylic acid-maleic acid copolymer added are about 1.2 to about 1.7 times the amounts to be adsorbed respectively by the calcium carbonate powder eventually obtained, based on the weight of the calcium carbonate.
Claim 13
Dependent Claim
134 words
An aqueous calcium carbonate slurry containing cubic calcium carbonate particles of 0.1 to 0.3 μm average size dispersed therein and having a low viscosity and a calcium carbonate concentration of up to 70% by weight, the slurry further containing, per 100 parts by weight of the calcium carbonate, 0.1 to 3.0 parts by weight of a substance comprising at least one water-soluble salt of a copolymer of 100 moles of isobutylene and 80 to 150 moles of maleic anhydride, the water-soluble salt having a molecular weight of 10,000 to 30,000, and 0.3 to 5.0 parts by weight of a material comprising at least one water-soluble salt of a copolymer of 100 moles of acrylic acid and 5 to 200 moles of maleic acid, the water-soluble salt having a molecular weight of 1000 to 20,000.
Claim 14
Dependent Claim
134 words
An aqueous calcium carbonate slurry containing cubic calcium carbonate particles of 0.1 to 0.3 μm average size dispersed therein and having a low viscosity and a calcium carbonate concentration of up to 70% by weight, the slurry further containing, per 100 parts by weight of the calcium carbonate, 0.1 to 3.0 parts by weight of a substance comprising at least one water-soluble salt of a copolymer of 100 moles of isobutylene and 80 to 150 moles of maleic anhydride, the water-soluble salt having a molecular weight of 10,000 to 30,000, and 0.3 to 5.0 parts by weight of a material comprising at least one water-soluble salt of a copolymer of 100 moles of acrylic acid and 5 to 200 moles of maleic acid, the water-soluble salt having a molecular weight of 1000 to 20,000.
Claim 15
Dependent Claim
108 words
An aqueous calcium carbonate slurry as defined in claim 9 containing, per 100 parts by weight of the calcium carbonate, (i) 0.1 to 1.0 part by weight of a substance comprising at least one water-soluble salt of a copolymer of 100 moles of isobutylene and 100 to 120 moles of maleic anhydride, the water-soluble salt having a molecular weight of 15,000 to 20,000, and (ii) 0.5 to 1.5 parts by weight of a material comprising at least one water-soluble salt of a copolymer of 100 moles of acrylic acid and 30 to 100 moles of maleic acid, the water-soluble salt having a molecular weight of 2000 to 5000.
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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) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |