Patent US4031055A successfully refreshed from Google Patents.
US4134931A
Expired / Lapsed
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Process for treatment of olefin polymer fibrils
Assignee: Chevron USA Inc
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Filing: 1978-03-16
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Granted: 1979-01-16
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Expires: 1998-03-16
Abstract
Abstract A process is disclosed for treating high molecular weight olefin polymer fibrils in the presence of an aqueous solution of polyvinyl alcohol while subjecting the solution to ultrasonic vibrations.
Inventors
- 👤 Dwight R. Hayes, Jr.
- 👤 Richard R. Whitney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:09
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H5/20; D21H5/202; D21H13/00; D21H13/10; D21H13/12; D21H13/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
69 words
In a process in which high molecular weight olefin polymer fibrils are prepared by precipitation from a hydrocarbon medium, refined in the presence of an organic liquid miscible with both hydrocarbons and water, and subsequently slurried in the presence of an aqueous solution of polyvinyl alcohol; the improvement which comprises slurrying said fibrils in the presence of said aqueous polyvinyl alcohol solution while subjecting said solution to ultrasonic vibrations.
Claim 2
Dependent Claim
69 words
In a process in which high molecular weight olefin polymer fibrils are prepared by precipitation from a hydrocarbon medium, refined in the presence of an organic liquid miscible with both hydrocarbons and water, and subsequently slurried in the presence of an aqueous solution of polyvinyl alcohol; the improvement which comprises slurrying said fibrils in the presence of said aqueous polyvinyl alcohol solution while subjecting said solution to ultrasonic vibrations.
Claim 3
Dependent Claim
27 words
The process of claim 1 in which the polyvinyl alcohol employed is present in the amount of about 1 to 10 parts per 100 parts of fibrils.
Claim 4
Dependent Claim
25 words
The process of claim 2 in which the refining is continued until the fibrils have sorbed at least about 2 weight % of polyvinyl alcohol.
Claim 5
Dependent Claim
32 words
The process of any of claims 1, 2, or 3 in which the fibrils are prepared from an ethylene polymer having a weight average molecular weight of at least about one million.
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) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |