# US 10,479,695 B2 · Porous titanate compound particles and method for producing same

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- Number: US 10,479,695 B2
- Document ID: US10479695B2
- Status: Granted
- Kind: B2
- Application number: 15/754,636
- Filed: 2016-09-05
- Published: 2018-08-23
- Granted: 2019-11-19
- Earliest claimed: 2015-09-24
- Assignees: Otsuka Chemical Co., Ltd.
- Applicants: Otsuka Chemical Co., Ltd.
- Inventors: Haruna Muragishi
- Web page: https://patentgrep.com/patent/US10479695B2

## CPC

- C01G 23/005: {Alkali titanates}
- C08J 5/0405: {with inorganic fibres}
- C08K 3/22: of metals
- F16D 69/02: Composition of linings {; Methods of manufacturing}
- F16D 69/025: {Compositions based on an organic binder}
- C01P 2004/03: obtained by SEM
- C01P 2004/60: Particles characterised by their size
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2004/62: Submicrometer sized, i.e. from 0.1-1 micrometer
- C01P 2006/12: Surface area
- C01P 2006/14: Pore volume
- C01P 2006/16: Pore diameter
- C01P 2006/90: Other properties not specified above
- C08J 2300/24: Thermosetting resins
- C08K 2003/2241: {Titanium dioxide}
- 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)
- 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)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

Provided are porous titanate compound particles capable of giving excellent fade resistance and moisture-proof properties when used in a friction material, a friction material composition, a friction material, a friction member, and a method for producing the porous titanate compound particles. Porous titanate compound particles have a cumulative pore volume of 5% or more within a pore diameter range of 0.01 to 1.0 μm, are each formed of titanate compound crystal grains bonded together, and each includes a treated layer formed on a surface thereof and made of a hydrophobic surface treatment agent.

## Claims

### Claim 1

Porous titanate compound particles having a cumulative pore volume of 5% or more within a pore diameter range of 0.01 to 1.0 μm, each formed of titanate compound crystal grains bonded together, and each of the porous titanate compound particles including a treated layer formed on a surface thereof and made of a hydrophobic surface treatment agent.

### Claim 2 (depends on 1)

The porous titanate compound particles according to claim 1, wherein the hydrophobic surface treatment agent is alkoxysilane represented by the following general formula (1):
R1nSi(OR2)4-n (1)
where in the general formula (1) n represents an arbitrary integer selected from 1 to 3; R1 represents an alkyl group, an alkenyl group or an aryl group, each group having a substituent or being free of substituent; as for R1 comprising a plurality of R1s, the plurality of R1s are identical to or different from each other; R2 is an alkyl group having a substituent or free of substituent; and as for R2 comprising a plurality of R2s, the plurality of R2s are identical to or different from each other.

### Claim 3 (depends on 1)

The porous titanate compound particles according to claim 1, having an average particle diameter of 5 to 500 μm.

### Claim 4 (depends on 1)

The porous titanate compound particles according to claim 1, wherein the titanate compound is expressed by a composition formula A2TinO(2n+1) where A represents at least one selected from alkali metals and n=2 to 8.

### Claim 5 (depends on 1)

A friction material composition containing: the porous titanate compound particles according to claim 1; and a thermosetting resin.

### Claim 6 (depends on 5)

A friction material obtained by forming the friction material composition according to claim 5.

### Claim 7 (depends on 6)

A friction member comprising a substrate and the friction material according to claim 6, the friction material being provided on the substrate.

### Claim 8 (depends on 1)

A method for producing the porous titanate compound particles according to claim 1, the method comprising the steps of:
mechanically grinding a titanium source and an alkali metal salt to prepare a ground mixture;
dry-granulating the ground mixture to prepare a granulated material;
firing the granulated material to produce a fired product; and
surface-treating the fired product with a hydrophobic surface treatment agent.