US4579926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the formation of novel acrylamide acrylate copolymers
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1984-04-09
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Granted: 1986-04-01
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Expires: 2004-04-09
Abstract
Abstract The present invention relates to a process for the formation of water soluble copolymers of acrylamide and alkyl poly(etheroxy)acrylate which are finished by a dialysis process and are excellent viscosification agents. Wherein the process includes the free radical copolymerization of acrylamide monomer and alkyl poly(etheroxy)acrylate monomer in an aqueous medium under nitrogen conditions in the presence of free radical initiator at a sufficient temperature and for a sufficient time to effect copolymerization.
Inventors
- 👤 John J. Maurer
- 👤 Donald N. Schulz
- 👤 Jan Bock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:40
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/52; C08F220/54; C08F220/56; C08F6/00; C08F6/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
A free radical copolymerization process for the formation of a copolymer of acrylamide/alky poly(etheroxy)acrylate which comprises the steps of: (a) forming an aqueous polymerization solution from acrylamide monomer, deoxygenated water under a nitrogen atmosphere and alkyl poly(etheroxy)acrylate; (b) heating said polymerization solution to at least 50° C.; (c) adding sufficient free radical initiator to said polymerization solution to initiate copolymerization of said acrylamide monomer and said alkyl poly(etheroxy)acrylate monomer; (d) polymerizing said acrylamide monomer and said alkyl poly(etheroxy)acrylate monomer in said polymerization solution for a sufficient period of time, at a sufficient temperature to form said copolymer, and (e) subjecting said polymerization solution to a dialysis process to remove unreacted monomer, low molecular weight byproducts and catalyst residues from said polymerization solution, said dialysis process comprising passing said polymerization solution thrugh a Spectrapor membrane (#2, molecular weight cut-off=12,000-14,000).
Claim 2
Dependent Claim
138 words
A free radical copolymerization process for the formation of a copolymer of acrylamide/alky poly(etheroxy)acrylate which comprises the steps of: (a) forming an aqueous polymerization solution from acrylamide monomer, deoxygenated water under a nitrogen atmosphere and alkyl poly(etheroxy)acrylate; (b) heating said polymerization solution to at least 50° C.; (c) adding sufficient free radical initiator to said polymerization solution to initiate copolymerization of said acrylamide monomer and said alkyl poly(etheroxy)acrylate monomer; (d) polymerizing said acrylamide monomer and said alkyl poly(etheroxy)acrylate monomer in said polymerization solution for a sufficient period of time, at a sufficient temperature to form said copolymer, and (e) subjecting said polymerization solution to a dialysis process to remove unreacted monomer, low molecular weight byproducts and catalyst residues from said polymerization solution, said dialysis process comprising passing said polymerization solution thrugh a Spectrapor membrane (#2, molecular weight cut-off=12,000-14,000).
Claim 3
Dependent Claim
14 words
A free radical process according to claim 1 wherein said copolymer is water soluble.
Claim 4
Dependent Claim
80 words
A free radical process according to claim 2 wherein said copolymer has substantially the formula: ##STR9## wherein R 1 is selected from the group consisting of C 1 to C 20 alkyl groups, C 6 to C 20 aryl groups and C 6 to C 30 alkylaryl groups, R 2 is hydrogen or methyl group, n is about 23 to 60, y is about 0.01 to about 5.00 mole %, and x is about 95.00 to about 99.99 mole %.
Claim 5
Dependent Claim
25 words
A free radical copolymerization process according to claim 1 wherein said R 1 is an alkyl group having about 1 to about 20 carbon atoms.
Claim 6
Dependent Claim
38 words
A free radical copolymerization process according to claim 4 wherein n is about 1 to about 60 mole %, y is about 0.04 to about 3.0 mole % and x is about 97.0 to about 99.0 mole %.
Claim 7
Dependent Claim
30 words
A free radical copolymerization process according to claim 1 wherein said reaction solution is maintained at a temperature of at least about 40° C. for at least about 5 hours.
Claim 8
Dependent Claim
41 words
A free radical copolymerization process according to claim 1 wherein said free radical initiator is selected from the group consisting of AIBN, H 2 O 2 , H 2 O 2 /Fe, H 2 O 2 /Ce (IV), and potassium persulfate.
References Cited (Backward Citations)
US2049828A
Cited
US3681269A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |