MODIFIED EPOXY RESIN AND ELECTRODEPOSITION COATING MATERIAL

WIPO Patent Application WO/2023/048273

A1

Provided is an epoxy resin which shows excellent curability in the case of using a low-activity catalyst or of low temperatures and has excellent storage stability and which gives coating materials excellent in terms of coating-film finish and anticorrosive property. The present invention further addresses the problem of providing: an amine-modified epoxy resin obtained by reacting the epoxy resin with an amine compound; and a cationic electrodeposition coating material including the amine-modified epoxy resin. The epoxy resin is a modified epoxy resin obtained by reacting at least (i) a compound (α) having one or more epoxy groups and (ii) a compound (β) having one or more functional groups reactive with an epoxy group, the total functionality of the functional groups being 3 or greater, and/or a compound (γ) having one or more functional groups reactive with an epoxy group, the total functionality of the functional groups being 1 or 2. The modified epoxy resin has an average degree of polyfunctionality (X1) per molecule, which is shown by the following equation (1), of 0.10 or greater. Equation (1): Average degree of polyfunctionality (X1) = (number of ends per molecule of the modified epoxy resin)-2

YAMADA NORIYUKI (JP)
TSUSHIMA SHINJI (JP)
IWAI TAKASHI (JP)

PCT/JP2022/035613

March 30, 2023

September 26, 2022

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KANSAI PAINT CO LTD (JP)

C08G59/40; C08G59/06; C08G59/14; C08G59/62; C09D5/44; C09D163/00

WO2020166657A1	2020-08-20
WO2016080483A1	2016-05-26
WO2021193635A1	2021-09-30

JPS606721A	1985-01-14
JP2019137724A	2019-08-22

YAMADA, Yasuyuki et al. (JP)

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