公开(公告)号：US20230089078A1

公开(公告)日：2023-03-23

申请号：US17800583

申请日：2021-02-24

Applicant: UNITIKA LTD. ,  NIPPON ESTER CO., LTD.

Inventor： Yumeto Fukubayashi ,  Yuta Tenma

IPC: C08G63/87 ,  C09J167/02

Abstract: A polyester resin comprises a dicarboxylic acid component and a glycol component, wherein the glycol component contains ethylene glycol together with diethylene glycol and triethylene glycol, and a content of triethylene glycol in the glycol component is more than 0.1 mol % and 5.5 mol % or less.

公开(公告)号：US11753500B2

公开(公告)日：2023-09-12

申请号：US17426228

申请日：2020-01-21

Applicant: UNITIKA LTD.

Inventor： Ayumi Yanaka ,  Yumeto Fukubayashi ,  Takatoshi Murakami

IPC: C08G59/40 ,  C08G59/42 ,  C08L63/00 ,  C08J5/24 ,  B32B27/38 ,  C08G59/02 ,  C08G59/22 ,  C08G59/32 ,  C08J5/04

CPC classification number: C08G59/4042 ,  C08G59/022 ,  C08G59/22 ,  C08G59/32 ,  C08G59/4238 ,  C08J5/04 ,  C08J5/249 ,  C08L63/00 ,  C08J2367/00 ,  C08L2201/08 ,  C08L2203/20

Abstract: The present invention provides an epoxy resin solution, from which an epoxy resin-cured product adequately excellent in heat-resisting properties and dielectric properties can be obtained with adequately good working properties ensured. The present invention relates to an epoxy resin solution containing at least a curing agent and an epoxy resin mixed in an organic solvent, wherein the curing agent comprises an imide group-containing curing agent having 1-4 imide groups and 2-4 glycidyl group-reactive functional groups in a molecule.

公开(公告)号：US10584212B2

公开(公告)日：2020-03-10

申请号：US15564678

申请日：2016-04-06

Applicant: UNITIKA LTD.

Inventor： Yumeto Fukubayashi ,  Makoto Nakai ,  Akira Shigeta ,  Munenori Yamada

IPC: C08G73/14 ,  C08L79/08

Abstract: The present invention is to provide a polyamide-imide which has a high regularity of molecular structure and few branched structures, does not contain hydrogen halide, is not required to be separated and purified in post processes, and can be suitably used as a film, a varnish, or a molding material; raw material salt of polyamide-imide and production method thereof.The polyamide-imide has a repeating unit represented by the general formula (1): in which R1, R2 represent independently a divalent residue having an aromatic ring, an aliphatic ring or an aliphatic hydrocarbon; R3, R4 represent independently a trivalent residue having an aromatic ring or an aliphatic ring; and an hydrogen atom bonding to the respective rings may be replaced by another atom or an atomic group.