Cellulosic particles, spherical object comprising cross-linked polymer particles, and adsorbent for body fluid purification

• US 6,599,620 B2
• Filed: 08/17/1999
• Issued: 07/29/2003
• Est. Priority Date: 01/07/1997
• Status: Expired due to Fees

• Current Assignee: Kaneka Corporation
• Original Assignee: Kaneka Corporation
• Inventors: Fujita, Kouji, Okuyama, Tsutomu, Tanaka, Kouichiro, Takata, Satoshi
• Primary Examiner(s): Morris, Terrel
• Assistant Examiner(s): Vo, Hai
• Application Number:
  US09/341,181
• Publication Number:
  US 20030012941A1
• Time in Patent Office: 1,442 Days
• Field of Search: 428/304.4, 428/308.8, 428/315.5, 428/317.9, 428/323, 428/326, 428/327, 428/315.7, 502/400, 502/401, 502/404, 530/814, 530/415
• US Class Current: 428/317.9
• CPC Class Codes: C08J 2207/12 Sanitary use, e.g. diapers, napkins or bandages
• CPC Class Codes: C08J 2301/00 Characterised by the use of cellulose, modified cellulose or cellulose derivatives
• CPC Class Codes: C08J 2301/02 Cellulose; Modified cellulose
• CPC Class Codes: C08J 3/245 Differential crosslinking of one polymer with one crosslinking type, e.g. surface crosslinking
• CPC Class Codes: C08J 7/02 with solvents, e.g. swelling agents
• CPC Class Codes: C08J 9/236 using binding agents
• CPC Class Codes: C08J 9/36 After-treatment C08J9/22 takes precedence
• CPC Class Codes: Y10S 530/814 Cellulose or derivatives thereof
• CPC Class Codes: Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]
• CPC Class Codes: Y10T 428/249959 Void-containing component is wood or paper
• CPC Class Codes: Y10T 428/249978 Voids specified as micro
• CPC Class Codes: Y10T 428/249979 Specified thickness of void-containing component [absolute or relative] or numerical cell dimension
• CPC Class Codes: Y10T 428/249981 Plural void-containing components
• CPC Class Codes: Y10T 428/249982 With component specified as adhesive or bonding agent
• CPC Class Codes: Y10T 428/249986 Void-containing component contains also a solid fiber or solid particle
• CPC Class Codes: Y10T 428/249987 With nonvoid component of specified composition
• CPC Class Codes: Y10T 428/249991 Synthetic resin or natural rubbers
• CPC Class Codes: Y10T 428/249992 Linear or thermoplastic
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/253 Cellulosic [e.g., wood, paper, cork, rayon, etc.]
• CPC Class Codes: Y10T 428/254 : Polymeric or resinous material

Abstract

The present invention relates to a cellulosic particle body comprising interconnected cellulosic small particles with small interparticle spaces and to a method of producing said cellulosic particle body which comprises dispersing cellulosic small particles in an alkaline medium and contacting the resulting suspension with a coagulating solution. In this specification, the above technology will be referred to as the first invention.

Claims

1. An adsorbent for purification of a body fluid which comprises a perfusion type carrier having flow-through pores and sub-pores and, as immobilized thereon, a substance having an affinity for a target substance in the body fluid, and which has a mean particle diameter of not less than 200×

10<sup>−

6</sup> m and produces a perfusion effect when a housing packed with it is irrigated at a liner velocity of not less than 3×

10<sup>−

4</sup> m/s.

2. The adsorbent for purification of a body fluid according to claim 1 wherein the perfusion type carrier comprises a perfusion type cellulosic particle body which comprises porous cellulosic small particles interconnected to have void between the cellulosic small particles as produced by dispersing the porous cellulosic small particles in an alkaline medium to prepare a suspension and contacting the resulting suspension with a coagulating solution.

3. The adsorbent for purification of a body fluid according to claim 1 wherein the perfusion type cater is a spherical type body which comprises crosslinked polymer particles having diameters within a range of 10×

10<sup>−

6</sup> m to 1×

10<sup>−

3</sup> m with a standard deviation of not greater than 100% of their mean diameter and which has a diameter of 200×

10<sup>−

6</sup> m in to 100×

10<sup>−

3</sup> m, and satisfies the following conditions (A) to (C);

(A) that said crosslinked polymer particles are interconnected via an organic binder comprising a non-crosslinked polymer;

(B) that the surfaces of said crosslinked polymer particles have area(s) not covered with said organic binder but remaining exposed;

(C) that voids exist between the interconnected crosslinked polymer particles.

4. The adsorbent for purification of a body fluid according to claim 3 wherein said crosslinked polymer particles have diameters of 0.1×

10<sup>−

6</sup> m to 10×

10<sup>−

3</sup> m.

5. The adsorbent for purification of a body fluid according to claim 1 which comprises particles having diameters within a range of 200×

10<sup>−

6</sup> m to 4000×

10<sup>−

6</sup> m and is intended for use in direct contact with whole blood.

6. The absorbent for purification of a body fluid according to claim 1 wherein the ratio of the mean diameter of said perfusion type particles to the mean diameter of flow-through pores of the perfusion type carrier thereof is not greater than 70.

7. The adsorbent for purification of a body fluid according to claim 1 wherein the perfusion type carrier has a height equivalent to a theoretical plate of not greater than 0.5 m as determined when it is irrigrated with a solution containing a target substance alone at a liner velocity of 1×

10<sup>−

4</sup> m/s to 10×

10<sup>−

4</sup> m/s.

8. An adsorption apparatus for purification of a body fluid comprising the adsorbent according to claim 1, as a packing.

9. A method of purifying a body fluid which comprises purifying the body fluid by means of the adsorption apparatus for purification of the body fluid according to claim 8.