# US 2020/0399444 A1 · Nanocellulose/surfactant composite

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- Number: US 2020/0399444 A1
- Document ID: US20200399444A1
- Status: Published application
- Kind: A1
- Application number: 16/883,191
- Filed: 2020-05-26
- Published: 2020-12-24
- Earliest claimed: 2019-06-24
- Assignees: Sumitomo Rubber Industries, Ltd.
- Applicants: Sumitomo Rubber Industries, Ltd.
- Inventors: Sumiko MIYAZAKI; Daisuke SATO
- Web page: https://patentgrep.com/patent/US20200399444A1

## CPC

- C08L 1/02: Cellulose; Modified cellulose
- C08J 3/2053: {the additives only being premixed with a liquid phase}
- C08L 1/04: Oxycellulose; Hydrocellulose {, e.g. microcrystalline cellulose}
- C08L 7/00: Compositions of natural rubber
- C08J 2307/02: Latex
- C08L 2205/16: Fibres; Fibrils
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- 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)

## Abstract

The present invention provides nanocellulose/surfactant composites having excellent redispersibility in water and related compositions and methods, including methods for producing the composites. Included is a nanocellulose/surfactant composite containing a nanocellulose and a surfactant, the nanocellulose/surfactant composite having a moisture content of lower than 10%, the surfactant including an ionic surfactant having a weight average molecular weight of 3000 or more.

## Claims

### Claim 1

A nanocellulose/surfactant composite, comprising a nanocellulose and a surfactant,
the nanocellulose/surfactant composite having a moisture content of lower than 10%,
the surfactant comprising an ionic surfactant having a weight average molecular weight of 3000 or more.

### Claim 2 (depends on 1)

The nanocellulose/surfactant composite according to claim 1,
wherein the nanocellulose comprises at least one of a microfibrillated cellulose or a cellulose nanocrystal.

### Claim 3 (depends on 2)

The nanocellulose/surfactant composite according to claim 2,
wherein the microfibrillated cellulose has an average fiber diameter of 2 to 50 nm, an average fiber length of 10 μm or less, and a degree of crystallinity of 60 to 90%.

### Claim 4 (depends on 2)

The nanocellulose/surfactant composite according to claim 2,
wherein the cellulose nanocrystal has an average fiber diameter of 2 to 50 nm, an average fiber length of 500 nm or less, and a degree of crystallinity of 70% or more.

### Claim 5 (depends on 1)

A method for producing the nanocellulose/surfactant composite according to claim 1, the method comprising steps of:
mixing the ionic surfactant with a dispersion of the nanocellulose to prepare a liquid mixture, and
drying the liquid mixture.

### Claim 6 (depends on 1)

A rubber composition, comprising the nanocellulose/surfactant composite according to claim 1.