公开(公告)号：US20230273181A1

公开(公告)日：2023-08-31

申请号：US18105942

申请日：2023-02-06

Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.

Inventor： Yuko IWASAKI ,  Yumi SAKAGUCHI ,  Hiroaki YAMADA

IPC: G01N33/44 ,  G01N30/88 ,  G01N21/31

CPC classification number: G01N33/445 ,  G01N21/314 ,  G01N30/88 ,  G01N2021/3155 ,  G01N2030/8859

Abstract: Provided is a method of quantification of free sulfur that can accurately measure the free sulfur content of a rubber composition. The present disclosure relates to a method of quantification of free sulfur in a rubber composition, the method including extracting the free sulfur in the rubber composition with toluene.

公开(公告)号：US20240255477A1

公开(公告)日：2024-08-01

申请号：US18413722

申请日：2024-01-16

Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.

Inventor： Yuko IWASAKI ,  Yoshihiko KOMORI ,  Yumi KITAURA ,  Hiroaki YAMADA

IPC: G01N30/86 ,  G01N30/02 ,  G01N33/44

CPC classification number: G01N30/8634 ,  G01N30/8682 ,  G01N33/445 ,  G01N2030/025

Abstract: A method for estimating a state of wax in a rubber compound according to a first aspect includes the following: acquiring a chromatogram of an extracted component, by separating components thereof, in which the wax is extracted from the rubber compound including the wax; and deriving a distribution of normal hydrocarbons in the wax based on the chromatogram.