公开(公告)号：US20190338084A1

公开(公告)日：2019-11-07

申请号：US16480139

申请日：2018-01-19

Applicant: SUMITOMO RUBBER INDUSTRIES, LTD. ,  NIPPON PAPER INDUSTRIES CO., LTD.

Inventor： Sumiko MIYAZAKI ,  Takafumi KAWASAKI ,  Kotaro ITO ,  Yusuke YASUKAWA

IPC: C08J3/22 ,  C08L7/00 ,  B60C1/00

Abstract: The present invention aims to provide a method for producing a masterbatch with improved rubber physical properties such as tensile strength at break, rigidity, and fuel economy at high productivity by enhancing the amount of fillers incorporated into rubber and the dispersibility of fillers in rubber, as well as related products. The present invention relates to a method for producing a masterbatch, including: step (1) of mixing a rubber latex having a zeta potential of −100 to −20 mV with a filler dispersion having a zeta potential of −120 to −10 mV to prepare a latex compound; step (2) of adjusting the zeta potential of the latex compound obtained in step (1) to −30 to 0 mV; and step (3) of solidifying the coagulum obtained in step (2) with an organic solvent.

公开(公告)号：US20190211163A1

公开(公告)日：2019-07-11

申请号：US16315527

申请日：2017-07-05

Applicant: NIPPON PAPER INDUSTRIES CO., LTD.

Inventor： Kotaro ITO ,  Shinichi ONOGI ,  Yusuke YASUKAWA ,  Masahiro MORITA

IPC: C08J5/04 ,  C08B11/14 ,  C08B15/06 ,  C08K3/06 ,  C08L1/02 ,  C08L21/02

CPC classification number: C08J5/046 ,  B60C1/00 ,  C08B11/14 ,  C08B15/06 ,  C08J2321/02 ,  C08K3/06 ,  C08L1/02 ,  C08L21/00 ,  C08L21/02

Abstract: The present invention aims to provide a rubber composition having sufficient reinforcement and fatigue resistance even when a large strain is applied thereto, and the present invention is to provide a substituted carboxy group-containing modified cellulose nanofiber wherein at least part thereof has at least any one of a substituent represented by Formula (a): —CONH—R1 and a substituent represented by Formula (b): —COO—R1 (in Formulae (a) and (b), R1 is independently a C3-30 hydrocarbon having at least one unsaturated bond), and a rubber composition including the same.

公开(公告)号：US20180371182A1

公开(公告)日：2018-12-27

申请号：US16063884

申请日：2016-12-21

Applicant: NIPPON PAPER INDUSTRIES CO., LTD.

Inventor： Kotaro ITO ,  Yusuke YASUKAWA

IPC: C08J3/22 ,  C08K7/02 ,  C08L1/02 ,  C08L21/00

Abstract: Disclosed herein is method for preparing a masterbatch by dispersing chemically modified cellulose nanofibers having carboxy groups under acidic conditions and then mixing the dispersed cellulose nanofibers with rubber latex. More specifically, the present disclosure provides a method for producing a masterbatch, including: (A) a step of introducing a carboxy group to a cellulose-based raw material to prepare a modified cellulose; (B) a step of carrying out defibration treatment and dispersion treatment of the modified cellulose to prepare a cellulose nanofiber; (C) a step of acidifying the cellulose nanofiber to prepare an acid type cellulose nanofiber, and (D) a step of mixing the acid type cellulose nanofiber and a rubber component. The rubber composition having excellent strength such as tensile strength can be provided by using the obtained masterbatch.