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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
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.
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Patent Agency Ranking
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
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.
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公开(公告)号：US20220185998A1
公开(公告)日：2022-06-16
申请号：US17605071
申请日：2020-04-20
Applicant: NIPPON PAPER INDUSTRIES CO., LTD.
Inventor： Mei TAKAKI , Kotaro ITO , Hayato KATO
Abstract: An object of the present invention is to provide a rubber composition that has tensile strength at break and tensile elongation superior to a rubber composition produced without mixing a cellulose nanofiber and to provide a latex immersion liquid that is a raw material for the rubber composition and is used at a latex immersion step. Namely, the present invention provides a latex immersion liquid that includes (1) a rubber latex, (2) a modified cellulose nanofiber having an average fiber length of 200-400 nm, and (3) a defoaming agent and also provides a rubber composition produced through a latex immersion step using the obtained latex immersion liquid.
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公开(公告)号：US20190338084A1
公开(公告)日：2019-11-07
申请号：US16480139
申请日：2018-01-19
Inventor： Sumiko MIYAZAKI , Takafumi KAWASAKI , Kotaro ITO , Yusuke YASUKAWA
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.
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公开(公告)号：US20230192992A1
公开(公告)日：2023-06-22
申请号：US17768125
申请日：2020-10-19
Applicant: NIPPON PAPER INDUSTRIES CO., LTD.
Inventor： Kotaro ITO , Masahiro MORITA , Mei TAKAKI , Hayato KATO , Isamu ONO
CPC classification number: C08L1/04 , C08L71/02 , C08J3/12 , C08J3/203 , C08L23/16 , C08J2323/16 , C08J2301/02 , C08J2371/02
Abstract: A rubber additive composition may be capable of producing a rubber composition having well-balanced strength. Such rubber additive compositions may include: (A) anion-modified cellulose and (B) a hydrophobizing agent, wherein the hydrophobizing agent (B) includes at least one selected from the group consisting of (B1) a polyether amine having a primary amino group at an end of a polyether skeleton and (B2) an amine compound having a hydrocarbon group with a carbon number of 3 to 50 or a quaternary ammonium salt having a hydrocarbon group with a carbon number of 3 to 50.
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公开(公告)号：US20190119473A1
公开(公告)日：2019-04-25
申请号：US16085285
申请日：2017-03-15
Inventor： Sumiko MIYAZAKI , Kenya WATANABE , Takafumi KAWASAKI , Kotaro ITO
Abstract: The present invention aims to provide a rubber composition which has further enhanced dispersion of microfibrillated cellulose in rubber to provide excellent processability and further to provide excellent rigidity, tensile properties, and fuel economy while maintaining a good balance between them. The present invention also aims to provide a pneumatic tire formed from the rubber composition with high productivity which provides excellent handling stability, durability, and rolling resistance properties while maintaining a good balance between them. The rubber composition of the present invention contains: a rubber component; a chemically modified microfibrillated cellulose; and a filler, the chemically modified microfibrillated cellulose having a structure in which the hydroxyl hydrogen atoms of microfibrillated cellulose are partly substituted with a cationic group of a cationic group-containing compound.
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