# US 2026/0091982 A1 · Surface-treated hollow silica and method for producing surface-treated hollow silica

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2026/0091982 A1
- Document ID: US20260091982A1
- Status: Published application
- Kind: A1
- Application number: 19/411,483
- Filed: 2025-12-08
- Published: 2026-04-02
- Earliest claimed: 2023-06-16
- Assignees: AGC Inc.; Agc Si-Tech Co., Ltd.
- Applicants: AGC Inc.; Agc Si-Tech Co., Ltd.
- Inventors: Hiromichi KAMO; Shinnosuke ARIMITSU
- Web page: https://patentgrep.com/patent/US20260091982A1

## CPC

- C01B 33/18: Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof (preparation of aerogels by dehydrating gels C01B33/158; treatment to enhance the pigmenting or filling properties C09C)
- C08K 3/36: Silica
- C08K 5/14: Peroxides
- C08K 7/26: Silicon- containing compounds
- C08K 9/06: with silicon-containing compounds
- C08L 25/10: with conjugated dienes
- C08L 71/12: Polyphenylene oxides
- C08L 101/00: Compositions of unspecified macromolecular compounds
- C01P 2006/10: Solid density
- C01P 2006/12: Surface area
- C01P 2006/16: Pore diameter
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

Surface-treated hollow silica, having a peak area of an amine in chromatography being 70% or more of a theoretical value, and having a symmetry coefficient S of 8 or less in chromatography. A method for producing the surface-treated hollow silica, the method including: performing a surface treatment on untreated hollow silica, in which a value obtained by dividing a molecular weight of a silane coupling agent used in the surface treatment by the number of Si atoms contained in one molecule of the silane coupling agent is 100 to 300.

## Claims

### Claim 1

Surface-treated hollow silica, having a peak area of an amine in chromatography being 70% or more of a theoretical value, and having a symmetry coefficient S of 8 or less in the chromatography.

### Claim 2 (depends on 1)

The surface-treated hollow silica according to claim 1, having a density of 0.25 g/cm3 to 2.00 g/cm3.

### Claim 3 (depends on 1)

The surface-treated hollow silica according to claim 1, having a BET specific surface area of 1 m2/g to 100 m2/g.

### Claim 4 (depends on 1)

The surface-treated hollow silica according to claim 1, having a median diameter (d50) of 0.1 μm to 10 μm.

### Claim 5 (depends on 1)

A method for producing the surface-treated hollow silica according to claim 1, the method comprising:
performing a surface treatment on untreated hollow silica, wherein
a value obtained by dividing a molecular weight of a silane coupling agent used in the surface treatment by the number of Si atoms contained in one molecule of the silane coupling agent is 100 to 300.

### Claim 6 (depends on 5)

The method for producing the surface-treated hollow silica according to claim 5, wherein
the surface treatment comprises bringing the untreated hollow silica into contact with the silane coupling agent, followed by heating at a temperature of 50° C. to 200° C.

### Claim 7 (depends on 6)

The method for producing the surface-treated hollow silica according to claim 6, wherein
a solvent is used during the contact, and
a product A×B of a density A of the untreated hollow silica and a solvent charged amount B per gram of the untreated hollow silica is 0.5 to 2.5.

### Claim 8 (depends on 1)

A resin composition comprising:
the surface-treated hollow silica according to claim 1; and
a resin.