Patent US4370171A successfully refreshed from Google Patents.
US4370171A
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Method for dispersing comminuted solids
Assignee: Angus Chemical Co
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Filing: 1981-02-02
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Granted: 1983-01-25
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Expires: 2001-02-02
Abstract
Abstract A method for dispersing a comminuted solid in an aqueous medium using a combination of an alkanolamine and a polymeric carboxylic acid as the dispersing agent.
Inventors
- 👤 Glenn N. Robinson
- 👤 Charles E. Seeney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:42
CPC Classifications
C; C09; C09D; C09D17/00; C09D17/001; C09D7/00; C09D7/40; C09D7/45
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
42 words
A method for dispersing a comminuted solid in an aqueous medium comprising the step of using as a dispersant a combination of an alkanolamine with a polymeric carboxylic acid selected from the group consisting of polyacrylic acid, polymethacrylic acid and carboxymethyl cellulose.
Claim 2
Independent Claim
42 words
A method for dispersing a comminuted solid in an aqueous medium comprising the step of using as a dispersant a combination of an alkanolamine with a polymeric carboxylic acid selected from the group consisting of polyacrylic acid, polymethacrylic acid and carboxymethyl cellulose.
Claim 3
Dependent Claim
38 words
The method of claim 1 wherein the alkanolamine is 2-amino-2-methyl-1-propanol (AMP); 2-amino-1-butanol; 1,3-propanediol; 2-amino-2-hydroxymethyl-1,3-propanediol; or 2-amino-2-hydroxymethyl-1,3-propanediol or N-methyl and N,N-dimethyl derivatives thereof, or the mono-, di-, and triethanolamines or propanolamines or N-substituted alkyl derivatives thereof, or mixtures thereof.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein the combination of an alkanolamine with polyacrylic acid is used.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein the combination of an alkanolamine with polymethacrylic acid is used.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the polymeric acid is carboxymethyl cellulose.
Claim 7
Independent Claim
35 words
A method of dispersing a comminuted solid in an aqueous medium comprising the step of using as a dispersant a combination comprising 2-amino-2-methyl-1-propanol and polyacrylic acid having a molecular weight in the range of 1000-5000.
Claim 8
Independent Claim
35 words
A method of dispersing a comminuted solid in an aqueous medium comprising the step of using as a dispersant a combination comprising 2-amino-2-methyl-1-propanol and polyacrylic acid having a molecular weight in the range of 1000-5000.
Claim 9
Dependent Claim
20 words
The method of claim 1 wherein the alkanolamine is present in the combination in an equivalent weight ratio of 0.5-1.5:1.
Claim 10
Dependent Claim
21 words
The method of claim 1 wherein the alkanolamine is present in the combination in an equivalent weight ratio of about 1:1.
Claim 11
Dependent Claim
24 words
The method of claim 1 wherein the polyacrylic acid or polymethacrylic acid has a molecular weight in the range of about 1,000 to 10,000.
Claim 12
Dependent Claim
17 words
The method of claim 9 wherein the molecular weight is in the range of 1000 to 5000.
Claim 13
Dependent Claim
25 words
The method of claim 1 wherein the dispersant is used in an amount of 0.001% to 10.0% based on the weight of the comminuted solid.
Claim 14
Dependent Claim
15 words
The method of claim 8 wherein the amount of dispersant is from 0.01 to 5%.
Claim 15
Dependent Claim
15 words
The method of claim 8 wherein the amount of dispersant is from 0.1 to 1.0%.
Claim 16
Dependent Claim
15 words
The method of claim 1 wherein the comminuted solid is calcium carbonate formed in situ.
Claim 17
Dependent Claim
21 words
The method of claim 1 wherein the comminuted solid is a pigment and the aqueous medium is a water-based coating material.
Claim 18
Dependent Claim
19 words
An aqueous slurry of a comminuted pigment consisting essentially of a pigment, water and a salt of claim 1.
Claim 19
Dependent Claim
21 words
An aqueous slurry of a comminuted pigment consisting essentially of a pigment, water and a composition of 2-amino-2-methyl-1-propanol with polyacrylic acid.
Claim 20
Dependent Claim
21 words
An aqueous slurry of a comminuted pigment consisting essentially of a pigment, water and a composition of 2-amino-2-methyl-1-propanol with polyacrylic acid.
Claim 21
Dependent Claim
11 words
The slurry of claim 13 wherein the pigment is titanium dioxide.
Claim 22
Dependent Claim
21 words
A composition comprising an alkanolamine and polyacrylic or polymethacrylic acid, or mixtures thereof, in an equivalent weight ratio of 0.5-1.5:1 respectively.
Claim 23
Dependent Claim
21 words
A composition comprising an alkanolamine and polyacrylic or polymethacrylic acid, or mixtures thereof, in an equivalent weight ratio of 0.5-1.5:1 respectively.
Claim 24
Dependent Claim
10 words
The composition of claim 19 wherein the alkanolamine is 2-amino-2-methyl-1-propanol.
Claim 25
Dependent Claim
14 words
The composition of claim 20 wherein the alkanolamine is in combination with polyacrylic acid.
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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) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |