US4289679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing solutions of drag reducing substances
Assignee: ConocoPhillips Co
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Filing: 1979-12-14
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Granted: 1981-09-15
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Expires: 1999-12-14
Abstract
Abstract A method of producing ultra-high molecular weight polymers useful as drag reducing substances or antimist agents comprising; (1) polymerizing an alpha-olefin or olefins from 2 to 30 carbon atoms with a Ziegler catalyst in a light hydrocarbon solvent; (2) adding a heavy hydrocarbon diluent or a non-solvent suspending agent to the resulting polymer or copolymer mixture, and (3) removing substantially all of the light hydrocarbon component.
Inventors
- 👤 Mark P. Mack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:17
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C09; C09K; C09K3/00; C09K3/18; C08J2323/00; C08J2323/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
An improved method for producing solution of ultrahigh molecular weight polymers, which polymers are useful as drag reducing substances or anti-mist agents, comprising (1) polymerizing an alpha olefin or mixtures of alpha olefins containing from 2 to 30 carbon atoms in the presence of a Ziegler/Natta catalyst system to at least 5% of the monomer present in a polymerization grade hydrocarbon diluent; (2) adding the polymerization mixture obtained to a relatively heavy hydrocarbon diluent having a boiling point difference from the polymerization mixture sufficient to allow separation; and (3) removing substantially all polymerization grade hydrocarbon components, leaving the polymr dissolved in the heavy hydrocarbon diluent.
Claim 2
Dependent Claim
105 words
An improved method for producing solution of ultrahigh molecular weight polymers, which polymers are useful as drag reducing substances or anti-mist agents, comprising (1) polymerizing an alpha olefin or mixtures of alpha olefins containing from 2 to 30 carbon atoms in the presence of a Ziegler/Natta catalyst system to at least 5% of the monomer present in a polymerization grade hydrocarbon diluent; (2) adding the polymerization mixture obtained to a relatively heavy hydrocarbon diluent having a boiling point difference from the polymerization mixture sufficient to allow separation; and (3) removing substantially all polymerization grade hydrocarbon components, leaving the polymr dissolved in the heavy hydrocarbon diluent.
Claim 3
Dependent Claim
24 words
A method as described in claim 1 wherein removal of substantially all the polymerization grade hydrocarbon components is accomplished by evaporation or fractional distillation.
Claim 4
Dependent Claim
19 words
A method as described in claim 1 wherein the reaction is carried out in a polymerization grade hydrocarbon solvent.
Claim 5
Dependent Claim
61 words
A method as described in claim 3 wherein the polymerization grade hydrocarbon solvent is selected from the group consisting of ethylene, propylene, butene-1, hexene-1, heptene-1, octene-1, nonene-1, decene-1, 4-methyl-1-pentene, ethane, propane, butane, isobutane, pentane, hexane, heptane, octane, 2,2-dimethylbutane, 2,3-dimethylbutane, 2,2-dimethylheptane, 2,5-dimethylhexane, 2,2-dimethylpentane, 2,3-dimethylpentane, 2,4-dimethylpentane, 3,3-dimethylpentane, 3-ethylpentane, hexamethylethane, hexanes, 2-methylbutane, 2-methylhexane, 2-methylpentane, and 3-methylpentane, cyclohexane, methylcyclopentane, and 1,2,3,4-tetrahydronaphthalene, benzene, toluene, and xylene.
Claim 6
Dependent Claim
26 words
A method as described in claim 4 wherein the heavy hydrocarbon is selected from the group consisting of crude oil, jet fuel, gasoline, and diesel fuel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |