Patent US4736304A successfully refreshed from Google Patents.
US4584244A
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Preparation of cold flow resistant polymer powders
Assignee: ConocoPhillips Co
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Filing: 1985-05-28
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Granted: 1986-04-22
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Expires: 2005-05-28
Abstract
Abstract Free-flowing, reagglomeration-resistant powders are prepared utilizing finely divided polymer particles coated with alumina. The alumina-coated polymer powder exhibits cold-flow reagglomeration-resistance behavior and, when added to solvents specific for the alumina-coated polymer, dissolves very rapidly.
Inventors
- 👤 Jeff T. Fenton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:44
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; B; B01; B01J; B01J2/00; B01J2/30; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
27 words
A method for the preparation of highly reagglomeration-resistant, free-flowing solid polymer particles, comprising grinding said polymer to a desired size and coating the polymer particles with alumina.
Claim 2
Independent Claim
27 words
A method for the preparation of highly reagglomeration-resistant, free-flowing solid polymer particles, comprising grinding said polymer to a desired size and coating the polymer particles with alumina.
Claim 3
Dependent Claim
19 words
A method as described in claim 1 wherein the polymer grinding is carried out in the presence of alumina.
Claim 4
Dependent Claim
24 words
A method as described in claim 2 wherein the grinding is carried out at a cryogenic temperature below glass transition temperature of the polymer.
Claim 5
Dependent Claim
36 words
A method as described in claim 3 wherein the polymer is an ultrahigh molecular weight, noncrystalline polymer capable of reducing drag in hydrocarbons flowing through conduits, where such hydrocarbons are solvents with respect to the polymer.
Claim 6
Dependent Claim
32 words
Free-flowing, reagglomeration-resistant solid polymer particles coated with alumina which remain friable and free-flowing after being subjected to a compressive force of 10,000 pounds per square inch for a time of one minute.
Claim 7
Dependent Claim
32 words
Free-flowing, reagglomeration-resistant solid polymer particles coated with alumina which remain friable and free-flowing after being subjected to a compressive force of 10,000 pounds per square inch for a time of one minute.
Claim 8
Dependent Claim
37 words
The coated polymer particles of claim 5 wherein the polymer is an ultrahigh molecular weight, noncrystalline polymer capable of imparting drag reduction to hydrocarbons flowing through conduits, where such hydrocarbons are solvents with respect to the polymer.
References Cited (Backward Citations)
US4125569A
Cited
JPS59131559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |