US3936394A
Expired / Lapsed
US
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Polymer adsorbents and method for manufacture thereof
Assignee: Asahi Kasei Corp
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Filing: 1973-04-09
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Granted: 1976-02-03
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Expires: 1993-04-09
Abstract
Abstract The present invention is to provide a method of producing an adsorbent composed of micro-fibrils, comprising the steps of mixing two synthetic polymers in a mixing ratio of 20/80 - 80/20, both of said polymers being incompatible with each other when they are intimately mixed, subjecting the mixture in molten state to an extrusion molding to shape the article in the form of threads, ropes or films where at least one of the polymers assumes the forms of micro-fibrils, and thereafter treating the shaped article with a solvent which is incapable of dissolving or decomposing one polymer but capable of dissolving or decomposing the other constituent polymer. The polymer adsorbent obtained by the above method is characterized by superior adsorbing activity and high treating efficiency and can be used for a wide range of purpose of adsorption.
Inventors
- 👤 Tetsuhiro Kusunose
- 👤 Tatsuo Ishikawa
- 👤 Norio Akimoto
- 👤 Noboru Fukuma
- 👤 Kazuyoshi Imamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:51
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; B01J20/26
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
148 words
A method of producing an adsorbent composed of microfibrils, comprising the steps of a. mixing two synthetic polymer components A and B in a mixing ratio of 20/80 - 80/20, both of said polymer components having a number average molecular weight of at least 10,000 and being incompatible with each other when they are intimately mixed such that they remain undissolved in each other to form a separate phase when they are mixed and molded under heat, b. subjecting the mixture in molten state to an extrusion molding to shape the article in the form of threads, ropes or films where polymer A forms microfibrils, said molding being done at a draft ratio of 1.0 - 10.0 and thereafter, c. treating the shaped article with a solvent which is incapable of dissolving or decomposing the polymer A but capable of dissolving or decomposing the other constituent polymer B.
Claim 2
Independent Claim
148 words
A method of producing an adsorbent composed of microfibrils, comprising the steps of a. mixing two synthetic polymer components A and B in a mixing ratio of 20/80 - 80/20, both of said polymer components having a number average molecular weight of at least 10,000 and being incompatible with each other when they are intimately mixed such that they remain undissolved in each other to form a separate phase when they are mixed and molded under heat, b. subjecting the mixture in molten state to an extrusion molding to shape the article in the form of threads, ropes or films where polymer A forms microfibrils, said molding being done at a draft ratio of 1.0 - 10.0 and thereafter, c. treating the shaped article with a solvent which is incapable of dissolving or decomposing the polymer A but capable of dissolving or decomposing the other constituent polymer B.
Claim 3
Dependent Claim
59 words
A method according to claim 1, wherein polymer A is at least one selected from the group consisting of polyamides, polyesters, polyolefins and polyvinyls, the other constituent polymer B is at least one selected from the group consisting of polyamides, polyesters, polyolefins and polyvinyls, the polymers being selected so that selected polymer A is incompatible with selected polymer B.
Claim 4
Dependent Claim
34 words
A method according to claim 1, wherein polymer A consistes of at least one polyamide, the other constituent polymer B being at least one selected from the group consisting of polyesters, polyolefins and polyvinyls.
Claim 5
Dependent Claim
33 words
A method according to claim 1, wherein polymer A is at least one polyester, the other constituent polymer B being at least one selected from the group consisting of polyvinyls, polyamides and polyolefins.
Claim 6
Dependent Claim
30 words
A method according to claim 1, wherein said polymer A is at least one polyolefin, the other constituent B being selected from the group consisting of polyamides, polyesters and polyvinyls.
Claim 7
Dependent Claim
33 words
A method according to claim 1, wherein polymer A is at least one polyvinyl, the other constituent polymer B being at least one selected from the group consisting of polyamides, polyesters and polyolefins.
Claim 8
Dependent Claim
19 words
A method according to claim 1, wherein the mixing ratio of polymers A and B is 30/70 to 70/30.
Claim 9
Dependent Claim
58 words
A method of producing an adsorbent composed of microfibrils according to claim 1, in which a foaming agent is added at the time of mixing polymers A and B, said foaming agent being selected from the group consisting of diazo compounds, diazo-carboxylic acid compounds, aromatic sulfonylhydrazide compounds, azonitrile compounds, diazoamino compounds, inorganic carbonates, urea and thiourea type compounds.
Claim 10
Dependent Claim
34 words
A method of producing an adsorbent composed of microfibrils according to claim 1, wherein a substance selected from nylon salts and ε -lactams is added to the mixture, when polymer A is a polyamide.
Claim 11
Dependent Claim
10 words
An adsorbent obtained by the method according to claim 1.
Claim 12
Dependent Claim
22 words
A method of producinng an adsorption-filter, comprising laminating the adsorbent obtained by the method according to claim 1 into a stratified form.
Claim 13
Dependent Claim
31 words
A method of producing an adsorption-filter, wherein at least one layer of the adsorption-filter obtained by the method according to claim 11 is combined with at least one layer of fabric.
Claim 14
Dependent Claim
10 words
An adsorption-filter obtained by the method according to claim 12.
Claim 15
Dependent Claim
47 words
An adsorbent according to claim 1, wherein, on said adsorbent composed of micro-fibrils, at least one kind of powdered adsorbent selected from the group consisting of activated carbon, diatomaceus earth, bauxite, terra alba, bone char, almina, magnesia, silica gel, activated silica, nitrohumic acid and allophane is carried.
Claim 16
Dependent Claim
33 words
An adsorbent according to claim 14, wherein said powdered adsorbent is a powder of activated carbon, 5 to 500 weight percent of said activated carbon is carried on said adsorbent composed of micro-fibrils.
Claim 17
Dependent Claim
30 words
An absorbent according to claim 14, wherein said powdered adsorbent is a nitrohumic acid, 5 to 500 weight percent of said nitrohumic acid is carried on said adsorbent of microfibrils.
References Cited (Backward Citations)
US3416993A
Cited
US3442819A
Cited
US3538020A
Cited
US3551351A
Cited
US3617506A
Cited
US3682594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |