US3734819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene-vinyl acetate emulsion adhesive
Assignee: Union Oil Company of California
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Filing: 1972-02-14
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Granted: 1973-05-22
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Expires: 1992-02-14
Abstract
Abstract A process for the production of an aqueous emulsion of an ethylene-vinyl acetate polymer is disclosed wherein the polymerization is performed in the presence of a heel, a small amount of a vinyl or C3 to C12 vinylalkylene, vinylcycloalkylene or vinylarylene sulfonic acid or the sodium, potassium, lithium or ammonium salt thereof and a minor amount of a polyvinyl alcohol protective colloid. The heel is an aqueous emulsion of an ethylene vinyl-acetate polymer which contains from 1 to 20 weight percent ethylene and a small amount of polyvinyl alcohol colloid. The polymerization is performed under an ethylene pressure of 100 to 1,000 psig., sufficient to incorporate from 1 to 20 weight percent ethylene into the final polymer product and carried out until the total free monomer content of the emulsion is maintained below about 1 weight percent. Conventional free radical initiation of the polymerization reaction is used. The resultant emulsion can be used as an adhesive since films formed therefrom exhibit a high degree of adhesiveness to vinyl surfaces.
Inventors
- 👤 G Knutson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:26
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; C; C08; C08F; C08F261/00; C08F261/02; C08F261/04; B32B27/30; B32B7/00; B32B7/04; B32B7/12; C09; C09J; C09J151/00; C09J151/003; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
21 words
The process defined in claim 1 wherein said sulfonic comonomer is the sodium, potassium or ammonium salt of vinyl sulfonic acid.
Claim 2
Dependent Claim
26 words
The process defined in claim 1 wherein said protective colloid is selected from the class consisting of hydrolyzed starch, hydroxyethyl cellulose, carboxymethyl cellulose and polyvinyl alcohol.
Claim 3
Dependent Claim
16 words
The process as defined in claim 1 wherein said protective colloid is fully hydrolyzed polyvinyl alcohol.
Claim 4
Dependent Claim
13 words
The process defined in claim 4 wherein said polymerization catalyst is potassium persulfate.
Claim 5
Dependent Claim
46 words
The process defined in claim 1 wherein said heel comprises an aqueous emulsion containing about 55 weight percent of solids and comprising between about 1.5 and 2.5 weight percent of polyvinyl alcohol and an ethylene-vinyl acetate copolymer containing between about 10 and 15 weight percent ethylene.
Claim 6
Dependent Claim
24 words
The process defined in claim 1 wherein between about 0.01 and 10 weight percent of a plasticizer is also emulsified in said aqueous medium.
Claim 7
Dependent Claim
25 words
The process defined in claim 1 wherein between about 0.01 and 5 weight percent of an emulsifying agent is also emulsified in said aqueous medium.
Claim 8
Dependent Claim
195 words
A process for the production of an emulsion adhesive which comprises: emulsifying in an aqueous medium having a pH of about 4 to 8 the following components: (1) between about 10 and 20 weight percent of a heel comprising an aqueous emulsion having a viscosity of about 1,100 to 1,600 centipoises at 77*C. and containing about 50 and 60 weight percent of an ethylene-vinyl acetate copolymer having from about 10 to 15 weight percent ethylene and also containing about 1.5 to 2.5 weight percent of polyvinyl alcohol; (2) between about 20 and 55 weight percent vinyl acetate; and (3) between about 0.1 and 0.6 weight percent sodium vinyl sulfonate; contacting the emulsified mixture with between about 1 and 4 weight percent of fully hydrolyzed polyvinyl alcohol, between about 0.1 and 3 weight percent of potassium persulfate and ethylene at a pressure of between 200 and 600 psig and a temperature between about 170* and 180*F.; and agitating said mixture and activating said initiator to polymerize said ethylene, vinyl acetate and sodium vinyl sulfonate until the amount of unreacted vinyl acetate and sodium vinyl sulfonate in the emulsion is reduced to less than 0.6 weight percent.
Claim 9
Dependent Claim
24 words
The process defined in claim 9 wherein about 0.001 to 0.2 weight percent of potassium formaldehyde sulfoxylate is also emulsified in said aqueous medium.
Claim 10
Dependent Claim
9 words
The product produced by the method of claim 1.
Claim 11
Dependent Claim
44 words
An article of manufacture comprising a substrate having a solid surface, a vinyl plastic having a surface conjunctive with the solid surface of said substrate and adhered thereto by an adhesive interlayer formed from an adhesive emulsion prepared by the method of claim 1.
Claim 12
Dependent Claim
12 words
The article in claim 12 wherein said vinyl plastic is polyvinyl chloride.
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |