Patent US4659771A successfully refreshed from Google Patents.
US4659771A
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Polyacrylate dispersions
Assignee: Hercules LLC
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Filing: 1986-06-23
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Granted: 1987-04-21
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Expires: 2006-06-23
Abstract
Abstract Disclosed are aqueous polyacrylate dispersions having improved rheological and stability characteristics prepared by the emulsion polymerization of acrylic esters, methacrylic esters and mixtures thereof in the presence of at least one protective colloid, wherein the improvement comprises conducting the polymerization in the presence of, by weight of the total monomer content, from about 0.1 to 5% of at least one substantially completely water-soluble monomer having conjugated unsaturation. The resultant aqueous polyacrylate dispersions are useful in the manufacture of latex paints, binders for nonwoven materials, water-based inks, paper coatings and water-borne adhesives, such as pressure-sensitive adhesives.
Inventors
- 👤 Daniel H. Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:58
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
72 words
A process for preparing an acrylic polymer latex by the aqueous emulsion polymerization of an acrylic ester, a methacrylic ester or mixtures thereof, and, optionally, a minor amount of a comonomer, in the presence of a protective colloid and a polymerization initiator, wherein the improvement comprises conducting the polymerization in the presence of from about 0.1% to 5%, by weight of the total monomer, of a substantially completely water-soluble conjugated unsaturated monomer.
Claim 2
Dependent Claim
72 words
A process for preparing an acrylic polymer latex by the aqueous emulsion polymerization of an acrylic ester, a methacrylic ester or mixtures thereof, and, optionally, a minor amount of a comonomer, in the presence of a protective colloid and a polymerization initiator, wherein the improvement comprises conducting the polymerization in the presence of from about 0.1% to 5%, by weight of the total monomer, of a substantially completely water-soluble conjugated unsaturated monomer.
Claim 3
Dependent Claim
50 words
The process of claim 1 wherein the substantially completely water-soluble conjugated unsaturated monomer is selected from the group consisting of furoic acid, styrene sulfonic acid, metal salts, amine salts, ammonium salts and quaternary salts of rosin and acids having C 4 to C 36 carbon atoms, and water-soluble derivatives thereof.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the protective colloid is present in an amount of from 0.05% to about 5%.
Claim 5
Dependent Claim
57 words
The process of claim 3 wherein the protective colloid is selected from the group consisting of hydroxyethyl cellulose, ethylhydroxyethyl cellulose, carboxymethyl cellulose, ethoxylated starch derivatives, partially and fully hydrolyzed polyvinyl alcohols, polyacrylic acid, sodium and other alkali metal polyacrylates, polyacrylamide, poly(methylvinyl ether-maleic anhydride), polyvinylpyrrolidone, water-soluble starch, glue, gelatin, water-soluble alginates, casein, agar and natural and synthetic gums.
Claim 6
Dependent Claim
28 words
The process of claim 1 wherein the acrylic ester is selected from the group consisting of alkyl acrylates wherein the alkyl group contains less than 10 carbon atoms.
Claim 7
Dependent Claim
28 words
The process of claim 1 wherein the methacrylic ester is selected from the group consisting of alkyl methacrylates wherein the alkyl group contains less than 10 carbon atoms.
Claim 8
Dependent Claim
21 words
The process of claim 1 wherein the comonomer is present in an amount of from about 0.5% to less than 50%.
Claim 9
Dependent Claim
81 words
The process of claim 1 wherein (i) all of the substantially completely water-soluble conjugated unsaturated monomer, (ii) from about 1% to about 50% of the remaining monomer mixture and (iii) one-half of the polymerization initiator is added in an initial reaction charge, the rest of the remaining monomer mixture is then added continuously over a period from about 2 to about 4 hours, and the remaining half of the polymerization initiator is added and the reaction continued until polymerization is complete.
Claim 10
Dependent Claim
24 words
The process of claim 8 wherein from about 8% to about 35% of the remaining monomer mixture is added in the initial reaction charge.
Claim 11
Dependent Claim
69 words
The process of claim 1 wherein (i) all of the substantially completely water-soluble conjugated unsaturated monomer, (ii) from about 1% to about 50% of the remaining monomer mixture and (iii) the polymerization initiator is added in an initial reaction charge, the rest of the remaining monomer mixture is then added continuously over a period from about 2 to about 4 hours and the reaction continued until polymerization is complete.
Claim 12
Dependent Claim
24 words
The process of claim 10 wherein from about 8% to about 35% of the remaining monomer mixture is added in the initial reaction charge.
Claim 13
Dependent Claim
69 words
The process of claim 1 wherein (i) all of the substantially completely water-soluble conjugated unsaturated monomer and (ii) from about 1% to about 50% of the remaining monomer mixture is used in an initial reaction charge, the polymerization initiator and the rest of the remaining monomer mixture are then added continuously over a period from about 2 to about 4 hours and the reaction continued until polymerization is complete.
Claim 14
Dependent Claim
24 words
The process of claim 12 wherein from about 8% to about 35% of the remaining monomer mixture is added to the initial reaction charge.
Claim 15
Dependent Claim
50 words
The process of claim 8 wherein the substantially completely water-soluble conjugated unsaturated monomer is selected from the group consisting of furoic acid, styrene sulfonic acid, metal salts, amine salts, ammonium salts and quaternary salts of rosin and acids having C 4 to C 36 carbon atoms, and water-soluble derivatives thereof.
Claim 16
Dependent Claim
48 words
The process of claim 10 wherein the water-soluble conjugated unsaturated monomer is selected from the group consisting of furoic acid, styrene sulfonic acid, metal salts, amine salts, ammonium salts and quaternary salts of rosin and acids having C 4 to C 36 carbon atoms, and water-soluble derivatives thereof.
Claim 17
Dependent Claim
48 words
The process of claim 12 wherein the water-soluble conjugated unsaturated monomer is selected from the group consisting of furoic acid, styrene sulfonic acid, metal salts, amine salts, ammonium salts and quaternary salts of rosin and acids having C 4 to C 36 carbon atoms, and water-soluble derivatives thereof.
Claim 18
Dependent Claim
9 words
The product produced by the process of claim 1.
Claim 19
Dependent Claim
9 words
The product produced by the process of claim 8.
Claim 20
Dependent Claim
9 words
The product produced by the process of claim 10.
Claim 21
Dependent Claim
9 words
The product produced by the process of claim 12.
References Cited (Backward Citations)
US3637563A
Cited
GB1278813A
Cited
US3876596A
Cited
US4029622A
Cited
US4031053A
Cited
US4265796A
Cited
US4540739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |