US3923711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wax coating compositions
Assignee: Union Oil Company of California
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Filing: 1972-04-05
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Granted: 1975-12-02
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Expires: 1992-04-05
Abstract
Abstract Wax coating compositions of improved water resistance are prepared by subjecting a molten blend of petroleum wax and an ethylene-vinyl acetate copolymer to controlled oxidation, either in the absence of any oxidation inhibitor, or in the presence of only limited amounts thereof, so as to effect a partial oxidation of the copolymer without significant oxidation of the wax component. Following the oxidation, inhibitor is added to provide commercially effective concentrations thereof.
Inventors
- 👤 Edward A Pullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:52
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/18; C; C08; C08L; C08L91/00; C08L91/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
83 words
A METHOD FOR PREPARING A WAX COATING BLEND HAVING REDUCED MOSITURE VAPOR PERMEABILITY WHICH COMPRISES: DISSOLVING AND BLENDING AN ETHYLENE-VINYL ACETATE COPOLYMER AND ABOUT 0-200 PPM OF AN ANTIOXIDANT IN MOLTEN PETROLEUM WAX, AND AGITATING AND MIXING THE MOLTEN WAX-POLYMER BLEND WITH AN OXYGEN-CONTAINING GAS FOR A TIME INSUFFICIENT TO SIGNIFICANTLY DEGRADE SAID WAX BUT SUFFICIENT TO PARTIALLY OXIDIZE SAID POLYMER, WHEREBY THE MOISTURE VAPOR PERMEABILITY OF THE BLEND IS SUBSTANTIALLY REDUCED AND THEREAFTER ADDING TO THE OXIDIZED BLEND AN INCREMENT OF ANTI-OXIDANT.
Claim 2
Independent Claim
83 words
A METHOD FOR PREPARING A WAX COATING BLEND HAVING REDUCED MOSITURE VAPOR PERMEABILITY WHICH COMPRISES: DISSOLVING AND BLENDING AN ETHYLENE-VINYL ACETATE COPOLYMER AND ABOUT 0-200 PPM OF AN ANTIOXIDANT IN MOLTEN PETROLEUM WAX, AND AGITATING AND MIXING THE MOLTEN WAX-POLYMER BLEND WITH AN OXYGEN-CONTAINING GAS FOR A TIME INSUFFICIENT TO SIGNIFICANTLY DEGRADE SAID WAX BUT SUFFICIENT TO PARTIALLY OXIDIZE SAID POLYMER, WHEREBY THE MOISTURE VAPOR PERMEABILITY OF THE BLEND IS SUBSTANTIALLY REDUCED AND THEREAFTER ADDING TO THE OXIDIZED BLEND AN INCREMENT OF ANTI-OXIDANT.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said oxidizing agent comprises air.
Claim 4
Dependent Claim
38 words
The method of claim 2 wherein said agitating and mixing is carried out at temperatures ranging from the melting point of the blend to about 450*F. for a time ranging from about 10 minutes to about 6 hours.
Claim 5
Dependent Claim
37 words
The method of claim 2 wherein the antioxidant concentration during said oxidation is between about 0-50 ppm, and wherein the total concentration of anti-oxidant after addition of said increment thereof is between about 100 and 800 ppm.
Claim 6
Dependent Claim
19 words
The method of claim 2 wherein said wax comprises principally paraffin wax and said antioxidant is a hindered phenol.
Claim 7
Dependent Claim
59 words
The method of claim 3 wherein said temperature ranges from about 200* to abot 350*F. for a time ranging from about 30 minutes to about 3 hours and wherein the anti-oxidant concentration during said oxidation is between about 5-50 ppm, and the total concentration of antioxidant after addition of said increment thereof is between about 200 and 600 ppm.
Claim 8
Dependent Claim
11 words
The method of claim 6 wherein said antioxidant is 2-6-ditertiary butyl-paracresol.
Claim 9
Dependent Claim
54 words
A coating composition comprising a blend of a paraffin wax, an ethylene-vinyl acetate copolymer, and about 200 - 600 ppm of an anti-oxidant, said vinyl acetate copolymer being in a partially oxidized state to provide a coating composition of reduced moisture vapor permeability, as compared to the same composition containing unoxidized ethylene-vinyl acetate copolymer.
Claim 10
Dependent Claim
54 words
A coating composition comprising a blend of a paraffin wax, an ethylene-vinyl acetate copolymer, and about 200 - 600 ppm of an anti-oxidant, said vinyl acetate copolymer being in a partially oxidized state to provide a coating composition of reduced moisture vapor permeability, as compared to the same composition containing unoxidized ethylene-vinyl acetate copolymer.
References Cited (Backward Citations)
US3644254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |