公开(公告)号：US11584821B2

公开(公告)日：2023-02-21

申请号：US17266847

申请日：2019-07-11

Applicant: SHOWA DENKO K.K.

Inventor： Hiroki Kuramoto ,  Kenichi Nakanishi ,  Shohei Nishizawa ,  Yoshishige Okuno

IPC: C08G18/00 ,  C07F9/50 ,  C09J175/02 ,  C08G18/79 ,  C08K5/50 ,  C08G59/40 ,  C08G18/76 ,  C08G18/72 ,  C09J163/00 ,  C08G18/73 ,  C08G18/18 ,  C08G18/16 ,  C08G18/75 ,  C08G18/02 ,  C08K5/5397

Abstract: A polyisocyanurate raw material composition containing a polyfunctional isocyanate, a compound (I) represented by general formula (I) shown below, and an epoxy compound. In general formula (I), each of R1 to R5 represents a hydrogen atom, an alkoxy group of 1 to 10 carbon atoms, an alkyl group of 2 to 10 carbon atoms (or an alkyl group of 1 to 10 carbon atoms in the case of R3 to R5), an aryl group of 6 to 12 carbon atoms, an amino group, a monoalkylamino group of 1 to 10 carbon atoms, a dialkylamino group of 2 to 20 carbon atoms, a carboxy group, a cyano group, a fluoroalkyl group of 1 to 10 carbon atoms, or a halogen atom (provide that R1 and R2 are not both hydrogen atoms).

公开(公告)号：US11639330B2

公开(公告)日：2023-05-02

申请号：US16640132

申请日：2018-07-30

Applicant: SHOWA DENKO K.K.

Inventor： Masaki Nanko ,  Naoya Fukumoto ,  Daisuke Yagyu ,  Yuta Yamaguchi ,  Tsuyoshi Kato ,  Hiroyuki Tomita ,  Katsumi Murofushi ,  Shohei Nishizawa

IPC: C07C255/13 ,  G11B5/725 ,  C07C43/205 ,  C07C255/17 ,  C07C255/19 ,  C07C255/50 ,  C07D333/16 ,  C08G65/08 ,  C10M107/38 ,  C10N40/18

Abstract: Provided is a fluorine-containing ether compound that can be suitably used as a material for a lubricant for a magnetic recording medium, capable of forming a lubricant layer having excellent chemical substance resistance and wear resistance even when the thickness is small. A fluorine-containing ether compound represented by the following formula (1): R1—R2—CH2—R3—CH2—R4—R5  (1) In the formula (1), R3 is a perfluoropolyether chain. R2 and R4 are divalent linkage groups having a polar group, and may be the same or different. R1 and R5 are terminal groups bonded to R2 or R4, which may be the same or different, and at least one of R1 and R5 is an organic group having 1 to 8 carbon atoms wherein one or more hydrogen atoms of the organic group is substituted with a cyano group.