公开(公告)号：US20250084191A1

公开(公告)日：2025-03-13

申请号：US18726943

申请日：2023-01-10

Applicant: NITTO DENKO CORPORATION

Inventor： Yoshihide KAWAGUCHI ,  Takashi SHIMIZU ,  Takeshi SAITO ,  Akifumi KIDO

IPC: C08F8/00 ,  C08F24/00 ,  G02B6/02

Abstract: One aspect of the present invention is a fluorine resin refining method. The method includes refining a fluorine resin by bringing the fluorine resin into contact with a fluorinating agent at a temperature of (Tg1−35)° C. or higher, where Tg1 is the glass transition temperature of the fluorine resin, and the fluorine resin includes a first fluorine-containing aliphatic ring structure in a molecular chain. The present invention makes it possible to produce a fluorine resin suitable for use in a plastic optical fiber. The first fluorine-containing aliphatic ring structure may have a dioxolane skeleton.

公开(公告)号：US20220373755A1

公开(公告)日：2022-11-24

申请号：US17764419

申请日：2020-09-30

Applicant: NITTO DENKO CORPORATION

Inventor： Yasuaki OKADA ,  Takeshi SAITO ,  Kenjiro SAOMOTO

IPC: G02B6/44 ,  G02B6/02

Abstract: A plastic optical fiber includes a plastic optical fiber body and a coloring member covering a peripheral surface of the plastic optical fiber body. The coloring member is made from a cured product of a curable composition containing an active-energy-ray-curable multifunctional acrylate and a coloring agent. The reaction percentage yield of the vinyl group of the active-energy-ray-curable multifunctional acrylate in the coloring member is 85% or more.

公开(公告)号：US20240210615A1

公开(公告)日：2024-06-27

申请号：US18553090

申请日：2022-03-29

Applicant: NITTO DENKO CORPORATION

Inventor： Takashi SHIMIZU ,  Hiroshi OHMURA ,  Takeshi SAITO

IPC: G02B6/02 ,  B29D11/00 ,  G02B6/44

CPC classification number: G02B6/02033 ,  B29D11/00663 ,  G02B6/44528

Abstract: A plastic optical fiber includes a core and a clad disposed on an outer circumference of the core. The core includes a first resin, and the clad includes a second resin. The first resin has a first glass transition temperature Tg1 of 120° C. or higher. The second resin has a second glass transition temperature Tg2 of 120° C. or higher. When the plastic optical fiber bent once 180 degrees at 25° C. has a curvature radius R and a minimum of the curvature radius R is defined as a curvature radius at which a crack does not occur in a bent portion of the plastic optical fiber, the minimum is 5 mm or less.

公开(公告)号：US20220373758A1

公开(公告)日：2022-11-24

申请号：US17764414

申请日：2020-09-30

Applicant: NITTO DENKO CORPORATION

Inventor： Yasuaki OKADA ,  Takeshi SAITO

IPC: G02B6/44 ,  B29D11/00

Abstract: A method for producing a plastic optical fiber including a step of dispersing a pigment in a curable composition containing an active-energy-ray-curable resin and the pigment, and a step of forming a coloring member made from a cured product of the curable composition by applying the curable composition on a peripheral surface of a plastic optical fiber body. The curable composition has a viscosity of 2,000 mPa or more and 3,000 mPa or less at 25° C. In the step of dispersing the pigment, the curable composition is charged into an airtight container having a circular tubular shape with an axis A1 and the airtight container is rotated around the axis A1 intersecting with a vertical line at a circumferential velocity of 0.02 m/sec or more and 0.2 m/sec or less.

公开(公告)号：US20190031794A1

公开(公告)日：2019-01-31

申请号：US16073034

申请日：2017-01-25

Applicant: NITTO DENKO CORPORATION

Inventor： Tatsuya YAMASAKI ,  Takeshi SAITO ,  Ryo KANNO

IPC: C08F20/56 ,  C09J133/26 ,  C09J4/00 ,  G02B5/30 ,  C08K5/55 ,  C08K5/07 ,  C08K5/45

Abstract: A curable resin composition, comprising a compound A represented by the following general formula (1): wherein X is a functional group containing a hydrogen donor group, and R1 and R2 each independently represent a hydrogen atom, or an aliphatic hydrocarbon group, aryl group or heterocyclic group that may have a substituent; a radical polymerization initiator B having a hydrogen withdrawing effect; and one or more radical polymerizable compounds C.