# US 11,077,033 B2 · Complexes of hydrotalcites and fibers

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- Number: US 11,077,033 B2
- Document ID: US11077033B2
- Status: Granted
- Kind: B2
- Application number: 16/318,368
- Filed: 2017-08-10
- Published: 2019-09-19
- Granted: 2021-08-03
- Earliest claimed: 2016-08-10
- Assignees: Nippon Paper Industries Co., Ltd.
- Applicants: Nippon Paper Industries Co., Ltd.
- Inventors: Masatoshi Oishi; Naoyuki Sugawara; Shisei Goto
- Web page: https://patentgrep.com/patent/US11077033B2

## CPC

- A61K 8/26: Aluminium; Compounds thereof
- D21H 17/63: Inorganic compounds
- A01N 59/06: Aluminium; Calcium; Magnesium; Compounds thereof
- A61Q 15/00: Anti-perspirants or body deodorants (deodorisation of air A61L9/00)
- C01F 7/00: Compounds of aluminium
- C01F 7/785: Hydrotalcite
- D06M 11/44: Oxides or hydroxides of elements of Groups 2 or 12 of the Periodic Table; Zincates; Cadmates
- D06M 11/45: Oxides or hydroxides of elements of Groups 3 or 13 of the Periodic Table; Aluminates
- D21H 11/00: Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H 13/00: Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material (chemical features in the manufacture of artificial fibres D01F)
- D21H 17/69: modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
- D21H 17/70: forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with other substances added separately
- D21H 21/36: Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
- C01P 2002/22: layered hydroxide-type, e.g. of the hydrotalcite-type
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- C01P 2004/03: obtained by SEM
- C01P 2006/10: Solid density
- 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)
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00})
- D06M: TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

The present invention aims to provide techniques for preparing complexes of a hydrotalcite and a fiber. The complexes of a hydrotalcite and a fiber can be synthesized efficiently by synthesizing the hydrotalcite in an aqueous system in the presence of the fiber.

## Claims

### Claim 1

A process for preparing a complex of a hydrotalcite and a cellulose fiber, wherein 60% or more of the surface of the cellulose fiber is covered with the hydrotalcite, and a proportion of hydrotalcite in the complex is 10% or more, comprising synthesizing the hydrotalcite in a solution containing the cellulose fiber, wherein the hydrotalcite is synthesized by:
(a) immersing the cellulose fiber in an alkaline solution, and then adding an acid solution to the immersed cellulose fiber; or
(b) immersing the cellulose fiber in an acid solution, and then adding an alkaline solution to the immersed cellulose fiber,
wherein the acid solution contains a divalent metal ion and a trivalent metal ion.

### Claim 2 (depends on 1)

The process of claim 1, further comprising adding a solution containing an anionic material to the complex of a hydrotalcite and a cellulose fiber.

### Claim 3 (depends on 2)

The process of claim 2, wherein the solution containing an anionic material is a copper- or silver-containing thiosulfato complex solution.

### Claim 4 (depends on 1)

The process of claim 1, wherein the divalent metal ion in the acid solution is magnesium or zinc.

### Claim 5 (depends on 1)

The process of claim 1, wherein the trivalent metal ion in the acid solution is aluminum.

### Claim 6 (depends on 1)

The process of claim 1, wherein the complex of a hydrotalcite and a cellulose fiber contains 10% or more of magnesium or zinc based on the ash content.

### Claim 7 (depends on 1)

The process of claim 1, wherein the proportion of hydrotalcite in the complex is 20% or more.

### Claim 8 (depends on 1)

The process of claim 1, wherein the proportion of hydrotalcite in the complex is 40% or more.