US4022736A
Expired / Lapsed
US
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Freeze-thaw stable, self-inverting, water-in-oil emulsion
Assignee: Wyeth Holdings LLC
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Filing: 1975-10-22
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Granted: 1977-05-10
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Expires: 1995-10-22
Abstract
Abstract A freeze-thaw stable, self-inverting, water-in-oil emulsion comprising an aqueous phase of a copolymer of acrylic acid, a hydrocarbon oil, a water-in-oil emulsifying agent and an inverting surfactant comprising a fatty alcohol-ethylene oxide reaction product and a method for the preparation thereof.
Inventors
- 👤 Joseph Michael Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:49
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08F; C08F220/00; C08F220/02; C08F220/52; C08F220/54; C08F220/56; C08K; C08K5/00; C08K5/01; C08L; C08L33/00; C08L33/24; C08L33/26; C08L71/00; C08L71/02; C09; C09K; C09K23/00; C09K23/42; C08J2333/00; C08J2333/24; C08J2333/26
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
244 words
A freeze-thaw stable, self-inverting, water-in-oil emulsion containing a dispersion therein of finely-divided copolymer particles, said emulsion comprising: A. an aqueous phase ranging from about 75% to about 95%, by weight, based on the total weight of A and B, which is comprised of: 1. a water soluble acrylamide-acrylic acid copolymer containing from about 25% to about 35%, by weight, based on the total weight of the copolymer, of an acrylic acid, the acrylic acid in said copolymer being from about 50% to about 75% neutralized and having a concentration from about 27% to about 68%, by weight based on the total weight of A, and 2. water in an amount ranging from about 32% to about 73%, by weight, based on the total weight of A, B. a liquid hydrocarbon oil in an amount ranging from about 5% to about 25%, by weight, based on the total weight of A and B, C. a water-in-oil emulsifying agent disposed between said aqueous phase and said liquid hydrocarbon at a concentration of about 0.1% to about 15.0%, by weight, based on the total weight of A, B and C and D. an inverting surfactant comprising the reaction product of about one mole of a fatty alcohol of about 12-18 carbon atoms with from about 6-10 moles of ethylene oxide in an amount ranging from more than about 2.0% to not over about 3.2%, by weight, based on the total weight of A, B, C and D.
Claim 2
Dependent Claim
244 words
A freeze-thaw stable, self-inverting, water-in-oil emulsion containing a dispersion therein of finely-divided copolymer particles, said emulsion comprising: A. an aqueous phase ranging from about 75% to about 95%, by weight, based on the total weight of A and B, which is comprised of: 1. a water soluble acrylamide-acrylic acid copolymer containing from about 25% to about 35%, by weight, based on the total weight of the copolymer, of an acrylic acid, the acrylic acid in said copolymer being from about 50% to about 75% neutralized and having a concentration from about 27% to about 68%, by weight based on the total weight of A, and 2. water in an amount ranging from about 32% to about 73%, by weight, based on the total weight of A, B. a liquid hydrocarbon oil in an amount ranging from about 5% to about 25%, by weight, based on the total weight of A and B, C. a water-in-oil emulsifying agent disposed between said aqueous phase and said liquid hydrocarbon at a concentration of about 0.1% to about 15.0%, by weight, based on the total weight of A, B and C and D. an inverting surfactant comprising the reaction product of about one mole of a fatty alcohol of about 12-18 carbon atoms with from about 6-10 moles of ethylene oxide in an amount ranging from more than about 2.0% to not over about 3.2%, by weight, based on the total weight of A, B, C and D.
Claim 3
Dependent Claim
18 words
An emulsion according to claim 1 wherein said copolymer comprises about 70% acrylamide and about 30% acrylic acid.
Claim 4
Dependent Claim
14 words
An emulsion according to claim 1 wherein said acrylic acid is about 60% neutralized.
Claim 5
Dependent Claim
32 words
An emulsion according to claim 1 wherein said inverting surfactant comprises about one mole of a mixture of C 12 -C 14 aliphatic alcohols reacted with about 7 moles of ethylene oxide.
Claim 6
Dependent Claim
17 words
An emulsion according to claim 1 wherein said water phase comprises about 67% water and 33% copolymer.
Claim 7
Dependent Claim
16 words
An emulsion according to claim 1 wherein the amount of said inverting surfactant comprises about 2.3%.
Claim 8
Dependent Claim
118 words
A method of preparing the freeze-thaw stable emulsion of claim 1 which comprises: A. forming a water-in-oil emulsion of 1. from about 75% to about 95%, by weight, based on the total weight of 1 and 2, of a solution of a. a mixture of acrylamide and an acrylic acid containing from about 25% to about 35%, by weight, based on the total weight of the mixture, of a 50- 75% neutralized acrylic acid, having a concentration from about 27% and about 68%, by weight, based on the total weight of a and b, and b. water, in an amount ranging from about 32%, to about 73%, by weight, based on the total weight of a and b,
Claim 9
Dependent Claim
161 words
a liquid hydrocarbon oil in an amount ranging from about 5% to about 25%, by weight, based on the total weight of 1 and 2, 3. a water-in-oil emulsifying agent in a concentration of about 0.1% to about 15.0%, by weight, based on the total weight of 1, 2 and 3, and 4. a free radical initiator comprising sodium metabisulfite and a hydroperoxide, B. polymerizing said monomers under free-radical polymerizing conditions to form a water-in-oil emulsion which contains dispersed therein finely divided particles of a copolymer of said acrylamide and said neutralized acrylic acid, and C. adding to said oil-in-water emulsion more than about 2.0% and not over 3.2%, by weight, based on the total weight of said 1, 2, 3 and C, of an inverting surfactant comprising the reaction product of about one mole of a fatty alcohol of about one mole of a fatty alcohol of about 12-18 carbon atoms with from about 6- 15 moles of ethylene oxide.
Claim 10
Dependent Claim
161 words
a liquid hydrocarbon oil in an amount ranging from about 5% to about 25%, by weight, based on the total weight of 1 and 2, 3. a water-in-oil emulsifying agent in a concentration of about 0.1% to about 15.0%, by weight, based on the total weight of 1, 2 and 3, and 4. a free radical initiator comprising sodium metabisulfite and a hydroperoxide, B. polymerizing said monomers under free-radical polymerizing conditions to form a water-in-oil emulsion which contains dispersed therein finely divided particles of a copolymer of said acrylamide and said neutralized acrylic acid, and C. adding to said oil-in-water emulsion more than about 2.0% and not over 3.2%, by weight, based on the total weight of said 1, 2, 3 and C, of an inverting surfactant comprising the reaction product of about one mole of a fatty alcohol of about one mole of a fatty alcohol of about 12-18 carbon atoms with from about 6- 15 moles of ethylene oxide.
Claim 11
Dependent Claim
21 words
A method according to claim 7 wherein said monomer mixture comprises about 70% acrylamide and about 30% of an acrylic acid.
Claim 12
Dependent Claim
14 words
A method according to claim 7 wherein said acrylic acid is about 60% neutralized.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |