US4129629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making hydrophilic polyolefin fibers containing clay
Assignee: Hoechst AG
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Filing: 1975-11-26
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Granted: 1978-12-12
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Expires: 1995-11-26
Abstract
Abstract Hydrophilic polyolefin fibers containing more than 50% by weight of clay are obtained by passing a mixture, which is kept under pressure and consists of a polyolefin, a solvent for the said polyolefin, clay, a hydrophilization agent, water and an amine, through a nozzle into a zone of low pressure. The fibers obtained can be used, with small expenditure for working up, for the manufacture of synthetic paper.
Inventors
- 👤 Wolfgang Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:52
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/11
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
A process for making hydrophilic clay-containing polyolefin fibers which comprises preparing a suspension of non-pre-hydrophobized clay particles in an emulsion of (a) a solution of a polyolefin in a volatile organic solvent and (b) an aqueous solution of a hydrophilizing agent, said emulsion containing from 0.05 to 5% by weight, based on the weight of clay, of an amine selected from aliphatic, aromatic and alkylaromatic amines having from 4 to 30 carbon atoms, said amine constituting 0.01 to 10 grams per liter of said suspension and the residence time of said amine in said emulsion being at least 10 seconds, superheating said suspension under at least an autogenous pressure and flowing said suspension through a restricted passage to a relatively low pressure zone to cause flash evaporation of said solvent and form said hydrophilic clay-filled polyolefin fibers.
Claim 2
Dependent Claim
137 words
A process for making hydrophilic clay-containing polyolefin fibers which comprises preparing a suspension of non-pre-hydrophobized clay particles in an emulsion of (a) a solution of a polyolefin in a volatile organic solvent and (b) an aqueous solution of a hydrophilizing agent, said emulsion containing from 0.05 to 5% by weight, based on the weight of clay, of an amine selected from aliphatic, aromatic and alkylaromatic amines having from 4 to 30 carbon atoms, said amine constituting 0.01 to 10 grams per liter of said suspension and the residence time of said amine in said emulsion being at least 10 seconds, superheating said suspension under at least an autogenous pressure and flowing said suspension through a restricted passage to a relatively low pressure zone to cause flash evaporation of said solvent and form said hydrophilic clay-filled polyolefin fibers.
Claim 3
Dependent Claim
24 words
The process of claim 1, wherein the organic amine is added to the suspension in liquid form or in the form of a solution.
Claim 4
Dependent Claim
20 words
The process of claim 1, wherein the polyolefin is a polyethylene having a density of from 0.93 to 0.97 g/cc.
Claim 5
Dependent Claim
17 words
The process of claim 1, wherein the polyolefin is a polypropylene having an atactic proportion of 0-25%.
Claim 6
Dependent Claim
13 words
The process of claim 1, wherein polyvinyl alcohol is used as hydrophilizing agent.
Claim 7
Dependent Claim
24 words
The process of claim 1, wherein a saturated C 5 or C 6 hydrocarbon or methylene chloride is used as solvent for the polyolefin.
Claim 8
Dependent Claim
22 words
The process of claim 1, wherein, prior to flash evaporation, the suspension has a temperature of from 110° C. to 200° C.
Claim 9
Dependent Claim
20 words
The process of claim 1, wherein a pressure from 10 to 1,500 torrs prevails in the zone of low pressure.
Claim 10
Dependent Claim
19 words
The process of claim 1, wherein 90% by weight of the clay has a particle size below 50 microns.
Claim 11
Dependent Claim
28 words
The process of claim 1, wherein the organic amine is used in an amount of from 0.1 to 1% by weight for each part by weight of clay.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |