# US 8,541,591 B2 · Nanoparticle/dispersant complex, nanoparticle dispersion liquid, and nanoparticle/matrix-material complex

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- Number: US 8,541,591 B2
- Document ID: US8541591B2
- Status: Granted
- Kind: B2
- Application number: 13/054,411
- Filed: 2009-07-27
- Published: 2011-06-16
- Granted: 2013-09-24
- Earliest claimed: 2008-07-28
- Assignees: Canon Kabushiki Kaisha
- Applicants: Jun Kato; Tetsushi Yamamoto
- Inventors: Jun Kato; Tetsushi Yamamoto
- Web page: https://patentgrep.com/patent/US8541591B2

## CPC

- C09C 1/3669: {Treatment with low-molecular organic compounds}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- C01G 23/047: Titanium dioxide
- C01G 23/053: Producing by wet processes, e.g. hydrolysing titanium salts
- C01G 23/0536: {by hydrolysing chloride-containing salts}
- C09C 1/36: Compounds of titanium {(C09C1/0009, C09C1/0015, C09C1/0078 take precedence)}
- C09C 1/40: Compounds of aluminium {(C09C1/0009, C09C1/0015, C09C1/0078, C09C1/32 take precedence)}
- C09C 1/407: {Aluminium oxides or hydroxides}
- C01P 2002/86: by NMR- or ESR-data
- C01P 2004/64: Nanometer sized, i.e. from 1-100 nanometer
- C01P 2006/60: Optical properties, e.g. expressed in CIELAB-values
- Y10T 428/2991: Coated
- C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS}
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; 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 cyanamide C01C3/16; thiocyanates C01C3/20)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided are a nanoparticle/dispersant complex having excellent dispersibility and long-term stability in a dispersion medium, a production method therefor, and a nanoparticle dispersion liquid and a nanoparticle/matrix-material complex which are colorless and transparent even at high concentrations. In the nanoparticle/dispersant complex, a nanoparticle is covered with a dispersant containing a heterocyclic cationic group and one of an oxo acid group containing a sulfur atom or a phosphorus atom and an anion moiety of the oxo acid group; in the nanoparticle dispersion liquid, the nanoparticle/dispersant complex is dispersed into a dispersion medium; in the nanoparticle/matrix-material complex, the nanoparticle/dispersant complex is dispersed into a matrix material; and the production method for a nanoparticle/dispersant complex comprises forming, under a presence of the dispersant, a nanoparticle covered with the dispersant from a nanoparticle precursor.

## Claims

### Claim 1

A phosphorus compound represented by formula (3):
R1—Ar+—R2—B—PO(OR3) (OR4).X− (3)
where Ar+ represents an imidazolium cation, B represents a single bond or an oxygen atom, R1 represents a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, R2 represents a single bond or a substituted or unsubstituted alkylene group having 1 to 30 carbon atoms, R3 represents a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, R4 represents a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, at least one of R3 and R4 represents a hydrogen atom, and X− represents an anion produced by dissociation of a proton from a protonic acid.

### Claim 2 (depends on 1)

A nanoparticle/dispersant complex comprising a nanoparticle covered with a dispersant containing the phosphorus compound according to claim 1.

### Claim 3 (depends on 2)

A nanoparticle dispersion liquid comprising the nanoparticle/dispersant complex according to claim 2 and a dispersion medium, wherein the nanoparticle/dispersant complex is dispersed in the dispersion medium.

### Claim 4 (depends on 2)

A nanoparticle/matrix-material complex comprising the nanoparticle/dispersant complex according to claim 2 and a matrix material, wherein the nanoparticle/dispersant complex is dispersed in the matrix material.