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US4801386A
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Process of using a porous water-treating material
Assignee: Mitsubishi Chemical Corp
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Filing: 1988-04-13
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Granted: 1989-01-31
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Expires: 2008-04-13
Abstract
Abstract A porous water-treating material comprising cut porous strands each comprising a resinous matrix material which consists essentially of a thermoplastic polymer material or a mixture thereof with an inorganic particulate material. Each strand having a number of pores connected to each other and an irregularly rugged peripheral surface which has a ratio in diameter of a circumscribed circle to an inscribed circle in any cross-sectional profile from 1.10:1 to 5.00:1 and a ratio of the distance between circumscribed lines to that between inscribed lines in any side projection profile of from 1.10:1 to 3.00:1. The cut porous strands are prepared by melt-extruding a resinous mixture of the resinous matrix material with a blowing agent at a temperature higher than the melting point of the thermoplastic polymer material and the thermally decomposing point of the blowing material so as to cause the strands to have a number of pores and an irregularly rugged peripheral surface thereof.
Inventors
- 👤 Shuichi Sugimori
- 👤 Tomihiko Kawamura
- 👤 Tadashi Matsuda
- 👤 Shintaro Nakano, deceased
- 👤 Sumito Saiki
- 👤 Hideaki Habara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:41
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28026; B01D; B01D17/00; B01D17/02; B01D17/0202; B01D17/04; B01D17/045; B01J20/28002; B01J20/28011; C; C08; C08J; C08J9/00; C08J9/0066; C02; C02F; C02F1/00; C02F1/68; C02F1/681; Y; Y10; Y10S; Y10S264/00; Y10S264/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
290 words
A method for absorbing colloidal or fine particles of oily substances dispersed or emulsified in water comprising passing water containing said colloidal or fine particles of oily substances dispersed or emulsified therein, through a porous water-treating material in the form of pellets comprising cut porous strands each comprising a resinous matrix material consisting essentially of at least one member selected from the group consisting of organic thermoplastic polymer material and mixtures of at least one organic thermoplastic polymer material with at least one inorganic particulate material in an amount of from 20% to 75% based on the weight of the resinous matrix material, and each having a number of pores formed therein and connectd to each other and an irregular ruggedness being to an extent such that, in any cross-sectional profile of each cut porous strand, the ratio of the diameter of a circumscribed circle to that of an inscribed circle in the cross-sectional profile is in the range from 1.10:1 to 5.00:1, that, in any side projection profile of each cut porous strand observed in a radius direction thereof, the ratio of the distance between a pair of circumscribed lines to that between a pair of inscribed lines in the side projection profile, the circumscribed and inscribed lines being parallel to the longitudinal axis of the cut porous strand, is in the range of from 1.10:1 to 3.00:1, and that in the side projection profile of each cut porous strand, an average D of the distance Do between the circumscribed lines and the distance Di between the inscribed lines is in a range of from 0.5 to 5.0 mm and the length of the profile is in a range of from 0.3 times to 3.0 times the average D.
Claim 2
Independent Claim
290 words
A method for absorbing colloidal or fine particles of oily substances dispersed or emulsified in water comprising passing water containing said colloidal or fine particles of oily substances dispersed or emulsified therein, through a porous water-treating material in the form of pellets comprising cut porous strands each comprising a resinous matrix material consisting essentially of at least one member selected from the group consisting of organic thermoplastic polymer material and mixtures of at least one organic thermoplastic polymer material with at least one inorganic particulate material in an amount of from 20% to 75% based on the weight of the resinous matrix material, and each having a number of pores formed therein and connectd to each other and an irregular ruggedness being to an extent such that, in any cross-sectional profile of each cut porous strand, the ratio of the diameter of a circumscribed circle to that of an inscribed circle in the cross-sectional profile is in the range from 1.10:1 to 5.00:1, that, in any side projection profile of each cut porous strand observed in a radius direction thereof, the ratio of the distance between a pair of circumscribed lines to that between a pair of inscribed lines in the side projection profile, the circumscribed and inscribed lines being parallel to the longitudinal axis of the cut porous strand, is in the range of from 1.10:1 to 3.00:1, and that in the side projection profile of each cut porous strand, an average D of the distance Do between the circumscribed lines and the distance Di between the inscribed lines is in a range of from 0.5 to 5.0 mm and the length of the profile is in a range of from 0.3 times to 3.0 times the average D.
Claim 3
Dependent Claim
43 words
The method as claimed in claim 1, wherein the organic thermoplastic polymer material is selected from the group consisting of homopolymers of ethylene, propylene, styrene, butadiene, isoprene, vinyl chloride, vinyl acetate, and acrylonitrile and copolymers containing at least one of the above-mentioned compounds.
Claim 4
Dependent Claim
19 words
The method as claimed in claim 2, wherein the organic thermoplastic polymer material comprises an ethylene homopolymer or copolymer.
Claim 5
Dependent Claim
33 words
The method as claimed in claim 1, wherein the amount of the inorganic particulate material is in the range of from 35% to 65% based on the weight of the resinous matrix material.
Claim 6
Dependent Claim
59 words
The method as claimed in claim 1, wherein the inorganic particulate material comprises at least one member selected from the group consisting of calcium carbonate, calcium silicate, magnesium oxide, magnesium sulfate, barium sulfate, iron oxides, iron hyroxides, hydrated iron oxides, titanium dioxide, titanium hydroxide, hydrated titanium hydroxide, alumina, silica, zinc oxide, manganese dioxide, kaolin clay, montmorillonite, talc, and attapulgite.
Claim 7
Dependent Claim
20 words
The method as claimed in claim 1, wherein the resinous matrix material additionally contains an organic cationic cross-linked polymer material.
Claim 8
Dependent Claim
32 words
The method as claimed in claim 6, wherein the cationic organic cross-linked polymer material is in an amount of from 0.1% to 20% based on the weight of the resinous matrix material.
Claim 9
Dependent Claim
76 words
The method as claimed in claim 6, wherein the cationic organic cross-linked polymer material comprises a cationic component consisting of at least one member selected from the group consisting of polyalkylene amines, aminoalcohols, aminomethacrylates, pyridine compounds, quinoline compounds, quaternary ammonium salts of the above-mentioned amino compounds, dicyandiamide compounds, and imidazole compounds and a cross-linking component consisting of at least one member selected from the groups consisting of epoxy compounds, acrylate compounds, epoxyacrylate compounds, and isocyanate compounds.
Claim 10
Dependent Claim
40 words
The method as claimed in claim 6, wherein the resinous matrix material contains an inorganic particulate material comprising a silicon-containing compound selected from the group consisting of silica, aluminum silicate, magnesium silicate, calcium silicate, talc, attapulgite, montmorillonite, and kaolin clay.
Claim 11
Dependent Claim
30 words
The method as claimed in claim 9, wherein the silicon-containing inorganic material is in an amount of from 1.5% to 75% based on the weight of the resinous matrix material.
Claim 12
Dependent Claim
41 words
The method as claimed in claim 1, wherein the cut porous strands are in a filling density of from 0.2 to 0.9 g/cm 3 under no load when they are filled in a water-treating space at a height of 20 cm.
Claim 13
Dependent Claim
28 words
The method as claimed in claim 11, wherein the filling density of the cut porous strands is in a range of from 0.3 to 0.7 g/cm 3 .
References Cited (Backward Citations)
US3238056A
Cited
US3729410A
Cited
US3901818A
Cited
US3800945A
Cited
US4079001A
Cited
US4332854A
Cited
US4523995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |