US4118356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of ethylene and vinyl acetate of increased insolubility
Assignee: Sherwin Williams Co
•
Filing: 1973-12-18
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Granted: 1978-10-03
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Expires: 1993-12-18
Abstract
Abstract Ethylene and vinyl acetate are copolymerized in aqueous emulsion using redox catalysts by copolymerizing vinyl acetate and ethylene monomers in an emulsion containing at least 10% by weight of emulsified particles of a copolymer of ethylene and vinyl acetate, with the unreacted vinyl acetate and ethylene providing a concentration of at least 10% by weight of unreacted monomers in the emulsion together with redox catalysts to cause a vigorous exothermic reaction. The copolymer exhibits substantially increased insolubility in organic solvents and aqueous caustic.
Inventors
- 👤 James E. Devona
- 👤 Abdullah M. Rokadia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:58
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04; C08F263/00; C08F263/02; C08F263/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
109 words
A method of copolymerizing ethylene and vinyl acetate to produce a copolymer containing 5-40% ethylene exhibiting increased insolubility in acetone and aqueous caustic comprising copolymerizing ethylene and vinyl acetate monomers in an aqueous emulsion further containing at least 10% by weight of emulsified particles of a copolymer of at least 50% by weight of copolymerized vinyl acetate and 5-40% by weight of copolymerized ethylene, said vinyl acetate and ethylene monomers being present in the emulsion in an amount of at least 10% by weight of unreacted monomers in the emulsion, and said emulsion also containing redox catalysts to cause the unreacted monomers to copolymerize in a vigorous exothermic reaction.
Claim 2
Independent Claim
109 words
A method of copolymerizing ethylene and vinyl acetate to produce a copolymer containing 5-40% ethylene exhibiting increased insolubility in acetone and aqueous caustic comprising copolymerizing ethylene and vinyl acetate monomers in an aqueous emulsion further containing at least 10% by weight of emulsified particles of a copolymer of at least 50% by weight of copolymerized vinyl acetate and 5-40% by weight of copolymerized ethylene, said vinyl acetate and ethylene monomers being present in the emulsion in an amount of at least 10% by weight of unreacted monomers in the emulsion, and said emulsion also containing redox catalysts to cause the unreacted monomers to copolymerize in a vigorous exothermic reaction.
Claim 3
Dependent Claim
26 words
A method as recited in claim 1 in which said ethylene monomer is used in an amount to provide a copolymer containing from 8-20% of ethylene.
Claim 4
Dependent Claim
23 words
A method as recited in claim 1 in which said unreacted monomers include vinyl chloride in an amount up to 30% by weight.
Claim 5
Dependent Claim
24 words
A method as recited in claim 1 in which said unreacted monomers include reactive monoethylenic monomer in an amount up to 2% by weight.
Claim 6
Dependent Claim
19 words
A method as recited in claim 4 in which said reactive monomer provides a reactive CH 2 OH group.
Claim 7
Dependent Claim
24 words
A method as recited in claim 1 in which said unreacted monomers include ethylenically unsaturated acid in an amount up to 2% by weight.
Claim 8
Dependent Claim
25 words
A method as recited in claim 1 in which the concentration of unreacted monomer in said emulsion of emulsified copolymer particles is at least 20%.
Claim 9
Dependent Claim
18 words
A method as recited in claim 1 in which the emulsion which is copolymerized includes hydroxy ethyl cellulose.
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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) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |