# US 8,771,742 B2 · Porous cellulose aggregate and molding composition thereof

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- Number: US 8,771,742 B2
- Document ID: US8771742B2
- Status: Granted
- Kind: B2
- Application number: 12/926,318
- Filed: 2010-11-09
- Published: 2011-03-17
- Granted: 2014-07-08
- Earliest claimed: 2005-04-22
- Assignees: Asahi Kasei Chemicals Corporation
- Applicants: Kazuhiro Obae; Hideki Amakawa; Ichiro Ibuki
- Inventors: Kazuhiro Obae; Hideki Amakawa; Ichiro Ibuki
- Web page: https://patentgrep.com/patent/US8771742B2

## CPC

- C08J 9/28: by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
- A23L 29/262: Cellulose; Derivatives thereof, e.g. ethers
- A23P 10/28: Tabletting; Making food bars by compression of a dry powdered mixture
- A61K 9/2018: {Sugars, or sugar alcohols, e.g. lactose, mannitol; Derivatives thereof, e.g. polysorbates}
- A61K 9/2054: {Cellulose; Cellulose derivatives, e.g. hydroxypropyl methylcellulose}
- A61K 9/2059: {Starch, including chemically or physically modified derivatives; Amylose; Amylopectin; Dextrin}
- A23V 2002/00: Food compositions, function of food ingredients or processes for food or foodstuffs
- C08J 2201/0504: the liquid phase being aqueous
- C08J 2301/02: Cellulose; Modified cellulose
- C08J 2397/02: Lignocellulosic material, e.g. wood, straw or bagasse
- Y10T 428/249921: Web or sheet containing structurally defined element or component
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- A23L: FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF (preservation thereof A23B)
- A23P: SHAPING OR WORKING OF FOODSTUFFS, NOT FULLY COVERED BY A SINGLE OTHER SUBCLASS
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A23V: INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A porous cellulose aggregate characterized by having a secondary aggregate structure resulting from aggregation of primary cellulose particles, having a pore volume within a particle of 0.265 to 2.625 cm3/g, containing I-type crystals and having an average particle size of over 30 to 250 μm, a specific surface area of 0.1 to less than 20 m2/g, a repose angle of 25° to less than 44° and a swelling degree of 5% or more, and characterized by having the property of disintegrating in water.

## Claims

### Claim 1

A method for producing a porous cellulose aggregate having an aggregate structure formed by aggregation of primary cellulose particles, having a pore volume within a particle of 0.265 cm3/g-2.625 cm3/g, containing type I crystals, and having an average particle size of more than 30 μm and 250 μm or less, a specific surface area of 0.1 m2/g or more and less than 20 m2/g, a repose angle of 25° or more and less than 44°, a swelling degree of 5% or more, and properties to disintegrate in water, the method comprising:
a step of obtaining a dispersion (hereinafter may also be designated as a cellulose dispersion) containing water and a natural cellulose material in which primary cellulose particles have an average particle size of 10 μm or larger and less than 50 μm, average width of 2-30 μm and average thickness of 0.5-5 μm, and
a step of drying thus obtained cellulose dispersion.

### Claim 2 (depends on 1)

The method according to claim 1, wherein said cellulose dispersion contains 10% by weight or less of particles that is not sedimented at a centrifugal condition of centrifugal force of 4900 m/s2.

### Claim 3 (depends on 1)

The method according to claim 1, wherein
said natural cellulose material is subjected to at least one processing selected from the group consisting of a mechanical treatment and a chemical treatment,
the mechanical treatment comprises crushing or grinding,
the chemical treatment comprises hydrolysis,
additional action is performed during or after the processing,
if the additional action is performed during the processing, then the additional action comprises shearing and stirring, and
if the additional action is performed after the processing, then the additional action comprises stirring.

### Claim 4 (depends on 1)

The method according to claim 1, wherein
shearing and stirring are performed during a step of subjecting said natural cellulose material to a mechanical treatment of crushing or grinding, and
after the mechanical treatment, shearing and stirring are performed during a step of subjecting said natural cellulose material to hydrolysis.

### Claim 5 (depends on 1)

The method according to claim 1, wherein said natural cellulose material is subjected to stirring during or after a step of hydrolysis.

### Claim 6 (depends on 3)

The method according to claim 3, wherein said cellulose dispersion contains 10% by weight or less of particles that are not sedimented at a centrifugal condition of centrifugal force of 4900 m/s2.

### Claim 7 (depends on 4)

The method according to claim 4, wherein said cellulose dispersion contains 10% by weight or less of particles that are not sedimented at a centrifugal condition of centrifugal force of 4900 m/s2.

### Claim 8 (depends on 5)

The method according to claim 5, wherein said cellulose dispersion contains 10% by weight or less of particles that are not sedimented at a centrifugal condition of centrifugal force of 4900 m/s2.

### Claim 9 (depends on 1)

The method according to claim 1, wherein said natural cellulose material is a wood pulp having a level-off polymerization degree of 130-250, a whiteness of 90-99%, S10 of 5-20% and S18 of 1-10%.

### Claim 10 (depends on 9)

The method according to claim 9, wherein said cellulose dispersion contains 10% by weight or less of particles that are not sedimented at a centrifugal condition of centrifugal force of 4900 m/s2.

### Claim 11 (depends on 2)

The method for producing the porous cellulose aggregate according to claim 2, wherein said natural cellulose material is a wood pulp having a level-off polymerization degree of 130-250, a whiteness of 90-99%, S10 of 5-20% and S18 of 1-10%.

### Claim 12 (depends on 3)

The method for producing the porous cellulose aggregate according to claim 3, wherein said natural cellulose material is a wood pulp having a level-off polymerization degree of 130-250, a whiteness of 90-99%, S10 of 5-20% and S18 of 1-10%.

### Claim 13 (depends on 4)

The method for producing the porous cellulose aggregate according to claim 4, wherein said natural cellulose material is a wood pulp having a level-off polymerization degree of 130-250, a whiteness of 90-99%, S10 of 5-20% and S18 of 1-10%.

### Claim 14 (depends on 5)

The method for producing the porous cellulose aggregate according to claim 5, wherein said natural cellulose material is a wood pulp having a level-off polymerization degree of 130-250, a whiteness of 90-99%, S10 of 5-20% and S18 of 1-10%.

### Claim 15 (depends on 6)

The method for producing the porous cellulose aggregate according to claim 6, wherein said natural cellulose material is a wood pulp having a level-off polymerization degree of 130-250, a whiteness of 90-99%, S10 of 5-20% and S18 of 1-10%.

### Claim 16 (depends on 7)

The method for producing the porous cellulose aggregate according to claim 7, wherein said natural cellulose material is a wood pulp having a level-off polymerization degree of 130-250, a whiteness of 90-99%, S10 of 5-20% and S18 of 1-10%.

### Claim 17 (depends on 8)

The method for producing the porous cellulose aggregate according to claim 8, wherein said natural cellulose material is a wood pulp having a level-off polymerization degree of 130-250, a whiteness of 90-99%, S10 of 5-20% and S18 of 1-10%.