# US 10,479,843 B2 · Method for producing natural rubber

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- Number: US 10,479,843 B2
- Document ID: US10479843B2
- Status: Granted
- Kind: B2
- Application number: 15/555,868
- Filed: 2016-03-17
- Published: 2018-03-08
- Granted: 2019-11-19
- Earliest claimed: 2015-04-02
- Assignees: Sumitomo Rubber Industries, Ltd.
- Applicants: Sumitomo Rubber Industries, Ltd.
- Inventors: Ai Matsuura; Lucksanaporn Tarachiwin; Kamalin Kanyawararak; Hironori Inamoto; Noa Kaneko
- Web page: https://patentgrep.com/patent/US10479843B2

## CPC

- C08C 3/00: Treatment of coagulated rubber
- C08C 3/02: Purification
- C08J 3/26: of latex
- C08L 7/00: Compositions of natural rubber
- C08C: TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The present invention provides a method for producing natural rubber with which the odors of solid natural rubber is easily reduced, and further which does not degrade physical properties such as heat aging resistance. The present invention relates to a method for producing natural rubber, the method including a sheeting step including sheeting a non-deproteinized solid natural rubber to form a natural rubber sheet, the natural rubber sheet having a moisture content of 20% or less.

## Claims

### Claim 1

A method for producing natural rubber, comprising
a sheeting step which includes sheeting a cup lump to form a natural rubber sheet,
wherein the natural rubber sheet has a thickness of 3 cm or less and a moisture content of 20% or less.

### Claim 2 (depends on 1)

The method for producing natural rubber according to claim 1, wherein the natural rubber sheet has a moisture content of 15% or less.

### Claim 3 (depends on 1)

The method for producing natural rubber according to claim 1, further comprising a base treatment step which includes bringing the natural rubber sheet into contact with a basic solution.

### Claim 4 (depends on 3)

The method for producing natural rubber according to claim 3, wherein the basic solution contains at least one basic inorganic substance selected from the group consisting of metal carbonates, metal hydrogen carbonates, metal phosphates, and ammonia.

### Claim 5 (depends on 3)

The method for producing natural rubber according to claim 3, wherein the basic solution further contains a surfactant.

### Claim 6 (depends on 4)

The method for producing natural rubber according to claim 4, wherein the basic solution further contains a surfactant.