Patent US5015423A successfully refreshed from Google Patents.
US5015423A
Expired / Lapsed
US
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Method of making uniform polymer particles
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1989-11-01
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Granted: 1991-05-14
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Expires: 2009-11-01
Abstract
Abstract Uniform polymer particles in a spherical form, having a three dimensional network structure, wherein not less than 80% by volume of the whole particles have a particle size within the range of ±20% of the volume average particle size of said uniform polymer particles, and said uniform polymer particles do not include particles having a particle size of not more than 5% of the volume average particle size, a process for preparing the uniform polymer particles, an apparatus suitable for use in the process, and a method of direct extracorporeal hemo-perfusion treatment using the uniform polymer particles. The uniform polymer particles of the present invention can be also used in various uses such as a parent material for an ion exchange resin, an adsorbent, and a packing material for a chromatography.
Inventors
- 👤 Tamiyuki Eguchi
- 👤 Michito Tsunomori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:14
CPC Classifications
B; B29; B29B; B29B9/00; B01; B01J; B01J2/00; B01J2/18; C; C08; C08J; C08J3/00; C08J3/12; C08J3/122
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
163 words
A process for preparing substantially uniform porous polymer particles which comprises: forming a solution of said polymer comprising said polymer and a solvent therefore; subjecting said polymer solution to cyclic turbulences having a substantially constant frequency of about 1,000 to 40,000 Hz sufficient to mechanically form substantially uniform liquid droplets of said solution which have substantially the same sign electric charge; jetting these droplets from an orifice into a gas atmosphere at a substantially constant flow rate; passing said droplets through said gas atmosphere; and impinging said droplets on a surface of a coagulating liquid, which is a non-solvent for said polymer, is miscible with said solvent and has a surface tension sufficient to spontaneously substantially wet said liquid droplets; wherein the distance between said orifice and said surface of said coagulating liquid is such that said droplets are not substantially deformed by their collision with the surface of said coagulating liquid, and wherein said coagulating liquid acts to coagulate said polymer droplets.
Claim 2
Dependent Claim
163 words
A process for preparing substantially uniform porous polymer particles which comprises: forming a solution of said polymer comprising said polymer and a solvent therefore; subjecting said polymer solution to cyclic turbulences having a substantially constant frequency of about 1,000 to 40,000 Hz sufficient to mechanically form substantially uniform liquid droplets of said solution which have substantially the same sign electric charge; jetting these droplets from an orifice into a gas atmosphere at a substantially constant flow rate; passing said droplets through said gas atmosphere; and impinging said droplets on a surface of a coagulating liquid, which is a non-solvent for said polymer, is miscible with said solvent and has a surface tension sufficient to spontaneously substantially wet said liquid droplets; wherein the distance between said orifice and said surface of said coagulating liquid is such that said droplets are not substantially deformed by their collision with the surface of said coagulating liquid, and wherein said coagulating liquid acts to coagulate said polymer droplets.
Claim 3
Dependent Claim
17 words
The process of claim 1, wherein said polymer solution has a viscosity of 10 to 2,000 cP.
Claim 4
Dependent Claim
16 words
The process of claim 1, wherein said turbulences have a frequency of 3,000 to 40,000 Hz.
Claim 5
Dependent Claim
16 words
The process of claim 1, wherein the solvent of said polymer solution is miscible with water.
Claim 6
Dependent Claim
18 words
The process of claim , wherein said liquid droplets have a diameter of not more than 1,000 μm.
Claim 7
Dependent Claim
17 words
The process of claim 1, wherein said liquid droplets have a diameter not more than 250 μm.
Claim 8
Dependent Claim
24 words
The process of claim 1, wherein said coagulating liquid has a surface tension not more than that of the solvent of the polymer solution.
Claim 9
Dependent Claim
13 words
The process of claim 1, wherein said coagulating liquid has an electric conductivity.
Claim 10
Dependent Claim
13 words
The process of claim 1, wherein said coagulating liquid is an aqueous solution.
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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) | 1994-05-13 | 1994-11-12 | 1995-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-13 | 1998-11-12 | 1999-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-13 | 2002-11-12 | 2003-05-14 | $7700.00 | Window Closed / Lapsed |