Patent US4519918A successfully refreshed from Google Patents.
US4519918A
Expired / Lapsed
US
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Process for the absorption of organic liquids by use of a hydrophobic fibrous material
Assignee: Papyrus Kopparfors AB
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Filing: 1983-01-24
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Granted: 1985-05-28
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Expires: 2003-01-24
Abstract
Abstract A process is provided for the absorption of organic liquids, particularly oil, using hydrophobic fibrous material prepared by impregnating fibrous material comprising cellulose fibers with a liquid resinous material selected from the group consisting of acrylate prepolymers and polymers, alkyd prepolymers and polymers, and polyester prepolymers and polymers in an amount to provide in the impregnated fibrous material from about 0.5 to about 30% by weight polyacrylate, polyalkyd or polyester, and then heating the impregnated fibrous material to convert the polymer or prepolymer by chemical reaction into a hydrophobic polymer rendering the fibrous material hydrophobic.
Inventors
- 👤 Thomas Ericsson
- 👤 Sten Gylfe
- 👤 Mats-Olov Hedblom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:02
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/681; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; C09; C09K; C09K3/00; C09K3/32; Y; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/922; Y10S210/924
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
96 words
A process for the absorption of surface layers of water-insoluble organic liquids floating on water which comprises contacting the surface layer with hydrophobic fibrous material prepared by impregnating cellulose pulp fibers with a liquid resinous material selected from the group consisting of acrylate prepolymers, alkyd prepolymers, and polyester prepolymers in an amount to provide in the impregnated fibrous material from about 0.5 to about 30% by weight polyacrylate, polyalkyd or polyester, and then hating the impregnated cellulose pulp fibers to convert the prepolymer by chemical reaction into a hydrophobic polymer rendering the cellulose pulp fibers hydrophobic.
Claim 2
Dependent Claim
96 words
A process for the absorption of surface layers of water-insoluble organic liquids floating on water which comprises contacting the surface layer with hydrophobic fibrous material prepared by impregnating cellulose pulp fibers with a liquid resinous material selected from the group consisting of acrylate prepolymers, alkyd prepolymers, and polyester prepolymers in an amount to provide in the impregnated fibrous material from about 0.5 to about 30% by weight polyacrylate, polyalkyd or polyester, and then hating the impregnated cellulose pulp fibers to convert the prepolymer by chemical reaction into a hydrophobic polymer rendering the cellulose pulp fibers hydrophobic.
Claim 3
Dependent Claim
18 words
A process according to claim 1 in which the chemical reaction is a further polymerization of the prepolymer.
Claim 4
Dependent Claim
24 words
A process according to claim 1 in which the chemical reaction is a cross-linking reaction using a cross-linking agent introducing cross-links between polymer chains.
Claim 5
Dependent Claim
23 words
A process according to claim 1 in which the impregnated cellulose pulp fibers comprises hydrophilic cellulose pulp fibers derived from cellulose-containing naturally-occurring material.
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) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |