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Patent US4510304A successfully refreshed from Google Patents.
US4510304A
Expired / Lapsed
US
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Polymer fractionation
Assignee: DAL PRODUCTS Inc
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Filing: 1982-09-30
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Granted: 1985-04-09
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Expires: 2002-09-30
Abstract
Abstract Soluble polymers are fractionated according to molecular weight by cryogenically comminuting the polymer and introducing the polymer particles, while still in the active state induced by cryogenic grinding, into a liquid having a solvent power selected to produce a coacervate fraction containing high molecular weight polymer species and a dilute polymer solution containing lower molecular weight polymer species. The coacervate may be physically separated from the solution and finds use in the production of antimisting jet fuels and the like.
Inventors
- 👤 Albert F. Hadermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:48
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/16; C10L1/1625; C10L1/1633; C10L1/1641; C08; C08F; C08F6/00; C08F6/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
87 words
A method for obtaining a high molecular weight fraction of a hydrocarbon soluble, rubbery, thermoplastic polymer which comprises: cryogenically comminuting said polymer to obtain discrete particles displaying a high surface energy state; admixing said polymer particles while still in said high energy state with a liquid of adjusted solvent power toward said polymer so as to obtain upon admixing said polymer with the liquid a high molecular weight, polymer-rich coacervate fraction and a lower molecular weight polymer solution; and separating said coacervate fraction from said polymer solution.
Claim 2
Independent Claim
87 words
A method for obtaining a high molecular weight fraction of a hydrocarbon soluble, rubbery, thermoplastic polymer which comprises: cryogenically comminuting said polymer to obtain discrete particles displaying a high surface energy state; admixing said polymer particles while still in said high energy state with a liquid of adjusted solvent power toward said polymer so as to obtain upon admixing said polymer with the liquid a high molecular weight, polymer-rich coacervate fraction and a lower molecular weight polymer solution; and separating said coacervate fraction from said polymer solution.
Claim 3
Dependent Claim
41 words
The method of claim 1 wherein the solvent power of said liquid is adjusted by admixing a minor amount of a non-solvent and a major amount of a good solvent, the non-solvent and good solvent being miscible one with the other.
Claim 4
Dependent Claim
21 words
The method of claim 2 wherein the non-solvent comprises an oxygenated hydrocarbon liquid and the good solvent comprises a hydrocarbon liquid.
Claim 5
Dependent Claim
10 words
The method of claim 3 wherein said non-solvent is acetone.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein the solvent power of said liquid is adjusted by adjusting the temperature of the liquid.
Claim 7
Dependent Claim
30 words
The method of claim 1 wherein said separated coacervate fraction is blended with a hydrocarbon flowing through a conduit in sufficient amount to reduce the friction resulting from said flow.
Claim 8
Dependent Claim
10 words
The method of claim 1 wherein said polymer is polyisobutylene.
Claim 9
Dependent Claim
24 words
The method of claim 1 wherein cryogenically comminuted polymer, while still at or near cryogenic temperature is continuously added to a flowing liquid stream.
Claim 10
Dependent Claim
35 words
The method of claim 1 wherein said coacervate fraction is frozen and cryogenically comminuted and is thereafter admixed with a liquid of selected solvent power to obtain a second coacervate of further enhanced molecular weight.
Claim 11
Dependent Claim
16 words
The method of claim 1 wherein polymer is recovered from said coacervate fraction by vacuum drying.
References Cited (Backward Citations)
US2993020A
Cited
US3790538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |