Patent US3816362A successfully refreshed from Google Patents.
US3816362A
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Process of preparing stable aqueous ethylene vinyl ester copolymer emulsions
Assignee: Resonac Holdings Corp
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Filing: 1971-05-19
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Granted: 1974-06-11
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Expires: 1991-05-19
Abstract
Abstract A process for preparing a stable aqueous ethylene-vinyl ester copolymer emulsion having a degree of polymerization of 600 to 4,000 and an ethylene content of 4 to 20 weight percent Emulsion polymerization is conducted at a temperature below 50*C in the presence of 0.02 to 0.2 percent of a redox catalyst until less than one percent of the monomer remains. The copolymer emulsion is then aged at a temperature of 50*C to 100*C for 0.5 to 5 hours.
Inventors
- 👤 T Tsuchihara
- 👤 Y Yawaka
- 👤 T Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:46
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
21 words
The process of claim 1, in which the ageing is conducted at a temperature of from 60*C to 90*C with stirring.
Claim 2
Dependent Claim
73 words
emulsion polymerizing said vinyl ester and ethylene at a temperature not exceeding 50*C. in the presence of from 0.02 to 0.2 percent by weight, based on the weight of said initial aqueous emulsion, of a redox catalyst for a period of time sufficient to form an intermediate aqueous ethylene-vinyl ester copolymer emulsion containing less than 1 percent by weight, based on the weight of said intermediate aqueous copolymer emulsion, of unreacted monomer; and
Claim 3
Dependent Claim
33 words
aging the intermediate aqueous emulsion at a temperature of from 50* to 100*C. for a period of time of from 0.5 to 5 hours to provide said stable aqueous ethylene-vinyl ester copolymer emulsion.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein said emulsifier is selected from the group consisting of an anionic surfactant, a nonionic surfactant and mixtures thereof.
Claim 5
Dependent Claim
27 words
The process of claim 3 wherein said anionic surfactant is selected from the group consisting of sodium laurylsulfate, sodium nonylphenyl sulfate, sodium nonylphenyl-polyoxyethylene sulfate and sodium octadecylsulfonate.
Claim 6
Dependent Claim
25 words
The process of claim 3 wherein said nonionic surfactant is selected from the group consisting of polyoxyethylene-glycol lauryl ether, polyoxyethylene-glycol nonylphenyl ether and polyoxyethylene-glycol monostearate.
Claim 7
Dependent Claim
23 words
The process of claim 3 wherein said redox catalyst consists essentially of an inorganic or organic peroxide in combination with a reducing agent.
Claim 8
Dependent Claim
35 words
The process of claim 4 wherein said organic peroxide is lauroyl peroxide, benzoyl peroxide, persuccinic acid, butyl peroxide and cumene hydroperoxide and wherein said inorganic peroxide is hydrogen peroxide, ammonium persulfate, potassium persulfate or perborates.
Claim 9
Dependent Claim
50 words
The process of claim 4 wherein said reducing agent is selected from the group consisting of sodium sulfite, sodium bisulfite, ferrous sulfate, tetraethylenepentamine and ascorbic acid and wherein the reducing agent is present in an amount of from 1 to 3 moles per mole of said inorganic or organic peroxide.
Claim 10
Dependent Claim
18 words
The process of claim 1 wherein said protective colloid is polyvinyl alcohol, water-soluble cellulose derivatives or polyoxyethylene glycol.
Claim 11
Dependent Claim
14 words
The process of claim 4 wherein the polymerization temperature varies from 10* to 50*C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |