US4175066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersant for calcium carbonate
Assignee: Kao Corp
•
Filing: 1978-04-05
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Granted: 1979-11-20
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Expires: 1998-04-05
Abstract
Abstract Calcium carbonate is dispersed by a dispersant comprising a salt of an acrylic acid/maleic acid copolymer.
Inventors
- 👤 Hiroji Shibazaki
- 👤 Setsuji Edagawa
- 👤 Hisashi Hasegawa
- 👤 Takashi Takeuchi
- 👤 Noboru Moriyama
- 👤 Yukihiro Fukuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:58
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/38; D21H19/385; C; C01; C01F; C01F11/00; C01F11/18; C01F11/185; C09; C09K; C09K23/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
An aqueous dispersion consisting essentially of water, calcium carbonate particles having a particle size of from 0.02 to 10 microns and, as a dispersing agent, from about 1 to about 5 wt. %, based on the weight of said calcium carbonate particles, of a salt of an acrylic acid/maleic acid copolymer or mixture thereof, the molar ratio of acrylic acid/maleic acid monomer units in said copolymer being in the range of from 100/5 to 100/200 and said copolymer having a molecular weight of from 1,000 to 20,000.
Claim 2
Dependent Claim
87 words
An aqueous dispersion consisting essentially of water, calcium carbonate particles having a particle size of from 0.02 to 10 microns and, as a dispersing agent, from about 1 to about 5 wt. %, based on the weight of said calcium carbonate particles, of a salt of an acrylic acid/maleic acid copolymer or mixture thereof, the molar ratio of acrylic acid/maleic acid monomer units in said copolymer being in the range of from 100/5 to 100/200 and said copolymer having a molecular weight of from 1,000 to 20,000.
Claim 3
Dependent Claim
18 words
An aqueous dispersion as claimed in claim 1 in which said molar ratio is from 100/10 to 100/100.
Claim 4
Dependent Claim
21 words
An aqueous dispersion as claimed in claim 1 in which the molecular weight of said copolymer is from 2000 to 10,000.
Claim 5
Dependent Claim
17 words
An aqueous dispersion as claimed in claim 1 in which said salt is an alkali metal salt.
Claim 6
Dependent Claim
18 words
An aqueous dispersion as claimed in claim 1 containing from 40 to 60 wt. % of calcium carbonate.
Claim 7
Independent Claim
109 words
A method of preparing an aqueous dispersion of calcium carbonate particles, said dispersion having a high concentration of calcium carbonate particles and a low viscosity, which comprises blending into a mixture consisting essentially of water and calcium carbonate particles having a particle size of from 0.02 to 10 microns, from 1 to 5 wt. %, based on the weight of said calcium carbonate particles, of a salt of an acrylic acid/maleic acid copolymer or mixture thereof, the molar ratio of acrylic acid/maleic acid monomer units in said copolymer being in the range of from 100/5 to 100/200 and said copolymer having a molecular weight of from 1,000 to 20,000.
Claim 8
Independent Claim
109 words
A method of preparing an aqueous dispersion of calcium carbonate particles, said dispersion having a high concentration of calcium carbonate particles and a low viscosity, which comprises blending into a mixture consisting essentially of water and calcium carbonate particles having a particle size of from 0.02 to 10 microns, from 1 to 5 wt. %, based on the weight of said calcium carbonate particles, of a salt of an acrylic acid/maleic acid copolymer or mixture thereof, the molar ratio of acrylic acid/maleic acid monomer units in said copolymer being in the range of from 100/5 to 100/200 and said copolymer having a molecular weight of from 1,000 to 20,000.
Claim 9
Dependent Claim
62 words
A method according to claim 6 in which said mixture contains from 40 to 60 wt. % of calcium carbonate and the balance is essentially water, said mixture having been obtained by filter-pressing an aqueous slurry obtained by blowing carbon dioxide into an aqueous suspension of calcium hydroxide to form an aqueous slurry containing 15 to 25 wt. % of calcium carbonate.
Claim 10
Dependent Claim
16 words
An aqueous dispersion as claimed in claim 1 in which said salt is an ammonium salt.
Claim 11
Dependent Claim
15 words
A method according to claim 6 in which said salt is an alkali metal salt.
Claim 12
Dependent Claim
14 words
A method according to claim 6 in which said salt is an ammonium salt.
References Cited (Backward Citations)
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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) | 1982-11-19 | 1983-05-21 | 1983-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-19 | 1987-05-21 | 1987-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-19 | 1991-05-21 | 1991-11-20 | $7700.00 | Window Closed / Lapsed |