US3673142A
Expired / Lapsed
US
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Preparation of stable latexes from ethylenically unsaturated polymerizable surfactant and solution of preformed water insoluble polymer of an ethylenically unsaturated compound
Assignee: Dow Chemical Co
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Filing: 1970-02-16
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Granted: 1972-06-27
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Expires: 1990-02-16
Abstract
Abstract Stable latexes are prepared by mixing a polymerizable surfactant, water and a substantially water-insoluble polymer dissolved in a non-aqueous solvent to form an initial dispersion of the solution in water, subjecting the dispersion to emulsion polymerization conditions, evaporating the solvent and optionally concentrating the remaining aqueous dispersion.
Inventors
- 👤 Frank L Saunders
- 👤 David P Sheetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:14
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/22
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
39 words
The process of claim 1 which has an additional step of concentrating the latex product to a solids content of from about 40 percent to about 70 percent by weight based on the total weight of the concentrated latex.
Claim 2
Dependent Claim
23 words
polymerizing in situ at least a predominant proportion of the polymerizable surfactant by subjecting the initial colloidal dispersion to emulsion polymerization conditions, and
Claim 3
Dependent Claim
138 words
removing at least a predominant proportion of the solvent; said solvent having a boiling point below that of pure water or being capable of forming an azeotrope with water which has a boiling point below that of pure water; and said polymerizable surfactant being an ethylenically unsaturated compound which has a hydrophobic portion which is predominantly hydrocarbon, a hydrophilic portion which is anionic, cationic or non-ionic and said polymerizable surfactant being soluble in water to an extent of at least 1 per cent by weight at 25* C., being capable of reducing the air/water surface tension to less than 40 dynes per centimeter at a concentration of 0.1 per cent by weight in water as determined at 25* C. and exhibiting a critical micelle concentration in pure water of less than 0.5 mole per liter at 25* C.
Claim 4
Dependent Claim
30 words
The process of claim 1 in which the solvent is a liquid which forms an azeotrope with water having a boiling point lower than the boiling point of pure water.
Claim 5
Dependent Claim
16 words
The process of claim 1 in which the hydrophilic portion of the polymerizable surfactant is cationic.
Claim 6
Dependent Claim
16 words
The process of claim 1 in which the hydrophilic portion of the polymerizable surfactant is non-ionic.
Claim 7
Dependent Claim
16 words
The process of claim 1 in which the hydrophilic portion of the polymerizable surfactant is anionic.
Claim 8
Dependent Claim
14 words
The process of claim 1 in which the polymerizable surfactant is an acrylamido compound.
Claim 9
Dependent Claim
20 words
The process of Claim 1 in which the polymerizable surfactant is a sulfo ester of an Alpha -methylene carboxylic acid.
Claim 10
Dependent Claim
20 words
The process of Claim 4 in which the polymerizable surfactant is a salt of N,N-dimethylaminoethyl methacrylate and a salt-forming acid.
Claim 11
Dependent Claim
23 words
The process of claim 5 in which the hydrophilic portion is -COO -(CH2CH2O)n H, wherein n averages from about 3 to about 20.
Claim 12
Dependent Claim
19 words
The process of claim 6 in which the hydrophilic portion is a carboxylic acid group or a salt thereof.
Claim 13
Dependent Claim
13 words
The process of claim 6 in which the surfactant is allyl Alpha -sulfopalmitate.
Claim 14
Dependent Claim
22 words
The process of Claim 7 in which the polymerizable surfactant is 9-acrylamidostearic acid, 10-acrylamidostearic acid, a mixture thereof or a salt thereof.
Claim 15
Dependent Claim
28 words
The process of Claim 7 in which the polymerizable surfactant is 9-acrylamidostearyl sulfate, 10-acrylamidostearyl sulfate, a mixture thereof or an alkali metal salt or an ammonium salt thereof.
References Cited (Backward Citations)
US2874151A
Cited
US3147301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |