US4419466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for continuous production of invert emulsion polymers
Assignee: Lubrizol Corp
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Filing: 1981-06-25
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Granted: 1983-12-06
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Expires: 2001-06-25
Abstract
Abstract Invert emulsion polymers are prepared by continuously circulating a system comprising a non-polar liquid and an aqueous solution of polymerizable monomers, continuously adding components to said system and continuously withdrawing a portion of said system comprising the desired invert emulsion polymer. The method is conveniently effected in a loop reactor. It is particularly effective for the production of invert emulsion polymers of acrylamidoalkanesulfonic acids and their salts; e.g., 2-acrylamido-2-methylpropanesulfonic acid.
Inventors
- 👤 Thomas R. Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:37
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/24; B01J19/2415; B01J19/2435; B01J19/243; C; C08; C08F; C08F2/00; C08F2/32; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00054; B01J2219/00056; B01J2219/00065; B01J2219/00074; B01J2219/00087; B01J2219/00177; Y; Y10; Y10S; Y10S526/00; Y10S526/918; Y10S526/92
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
83 words
A method for preparing an invert emulsion polymer which comprises the steps of: (I) continuously circulating, in a loop reactor, under polymerization conditions, a system comprising (A) a non-polar liquid which is inert to addition polymerization, and (B) an aqueous solution of one or more polymerizable monomers; (II) continuously adding components A and B to said system under conditions and in proportions to produce said invert emulsion polymer; and (III) continuously withdrawing a portion of said circulating system comprising said invert emulsion polymer.
Claim 2
Independent Claim
83 words
A method for preparing an invert emulsion polymer which comprises the steps of: (I) continuously circulating, in a loop reactor, under polymerization conditions, a system comprising (A) a non-polar liquid which is inert to addition polymerization, and (B) an aqueous solution of one or more polymerizable monomers; (II) continuously adding components A and B to said system under conditions and in proportions to produce said invert emulsion polymer; and (III) continuously withdrawing a portion of said circulating system comprising said invert emulsion polymer.
Claim 3
Dependent Claim
22 words
A method according to claim 1 wherein components A and B are mixed and the resulting mixture is added to said system.
Claim 4
Dependent Claim
17 words
A method according to claim 1 wherein components A and B are separately added to said system.
Claim 5
Dependent Claim
36 words
A method according to claim 1 wherein the residence time of the system in the reactor is at least about 20 minutes and the ratio of circulation rate to feed rate is at least about 100.
Claim 6
Dependent Claim
19 words
A method according to claim 1 wherein the reaction conditions include the use of a free radical polymerization initiator.
Claim 7
Dependent Claim
16 words
A method according to claim 5 wherein the polymerization initiator is at least one peroxy compound.
Claim 8
Independent Claim
17 words
A method according to any one of claims 1-3 or 5-6 wherein component A comprises mineral oil.
Claim 9
Dependent Claim
18 words
A method according to claim 7 wherein component B contains at least one acrylamidoalkanesulfonic acid or salt thereof.
Claim 10
Dependent Claim
23 words
A method according to claim 8 wherein component B is an alkaline solution in which one monomer is a salt of 2-acrylamido-2-methylpropanesulfonic acid.
Claim 11
Dependent Claim
17 words
A method according to claim 9 wherein the monomers in component B are sodium 2-acrylamido-2-methylpropanesulfonate and acrylamide.
Claim 12
Dependent Claim
20 words
A method according to claim 1 wherein the ratio of (B) to (A) is between about 3:1 and about 5:1.
Claim 13
Dependent Claim
24 words
A method according to claim 1 wherein component (A) contains a minor amount of an emulsifying agent adapted for stabilization of the invert emulsion.
Claim 14
Dependent Claim
18 words
A method according to claim 1 wherein component (A) contains a minor amount of a non-ionic emulsifying agent.
Claim 15
Dependent Claim
17 words
A method according to claim 1 wherein component (B) comprises about 30-50% by weight of said monomers.
Claim 16
Independent Claim
110 words
A method for preparing an invert emulsion polymer which comprises the steps of: (I) continuously circulating in a loop reactor under polymerization conditions, a system comprising (A) a non-polar liquid which is inert to addition polymerization and a minor amount of a non-ionic emulsifying agent, and (B) an aqueous solution of one or more polymerizable monomers comprising 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof; (II) continuously adding components (A) and (B) to said system to produce said invert emulsion polymer, the ratio of (B) to (A) being in the range of about 3:1 to about 5:1; and (III) continuously withdrawing a portion of said circulating system comprising said invert emulsion polymer.
Claim 17
Independent Claim
110 words
A method for preparing an invert emulsion polymer which comprises the steps of: (I) continuously circulating in a loop reactor under polymerization conditions, a system comprising (A) a non-polar liquid which is inert to addition polymerization and a minor amount of a non-ionic emulsifying agent, and (B) an aqueous solution of one or more polymerizable monomers comprising 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof; (II) continuously adding components (A) and (B) to said system to produce said invert emulsion polymer, the ratio of (B) to (A) being in the range of about 3:1 to about 5:1; and (III) continuously withdrawing a portion of said circulating system comprising said invert emulsion polymer.
Claim 18
Dependent Claim
17 words
A method according to claim 15 wherein component (B) comprises about 30-50% by weight of said monomers.
Claim 19
Dependent Claim
48 words
A method according to claim 15 wherein component (B) comprises about 45-50% by weight of said monomer, the weight ratio of (B) to (A) is in the range of about 3:1 to about 4.5:1, and the inherent viscosity of the emulsion is between about 5.0 and about 9.0.
Claim 20
Dependent Claim
33 words
A method according to claim 15 wherein the residence time of said system in the reactor is about 20 minutes and the ratio of circulation to feed rate is at least about 100.
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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |