US 12,291,632 B2
Epoxy resin composition
Shiori Tateno, Shiga (JP)
Assigned to SEKISUI CHEMICAL CO., LTD., Osaka (JP)
Appl. No. 17/278,841
Filed by SEKISUI CHEMICAL CO., LTD., Osaka (JP)
PCT Filed Sep. 10, 2019, PCT No. PCT/JP2019/035487
§ 371(c)(1), (2) Date Mar. 23, 2021,
PCT Pub. No. WO2020/066592, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 2018-180328 (JP), filed on Sep. 26, 2018.
Prior Publication US 2022/0041855 A1, Feb. 10, 2022
Int. Cl. C08L 63/00 (2006.01); C08F 216/38 (2006.01)
CPC C08L 63/00 (2013.01) [C08F 216/38 (2013.01)] 8 Claims
 
1. An epoxy resin composition comprising:
a modified polyvinyl acetal resin comprising a hydrogen-bonding group-containing constitutional unit; and
an epoxy resin,
wherein the hydrogen-bonding group-containing constitutional unit contains at least one constitutional unit selected from the group consisting of a carboxyl group-containing constitutional unit, a sulfonic acid group-containing constitutional unit, an amide group-containing constitutional unit, a phosphoric acid group-containing constitutional unit, a pyrrolidone ring group-containing constitutional unit, and an ethylene oxide group-containing constitutional unit,
the carboxyl group-containing constitutional unit is at least one selected from the group consisting of a constitutional unit represented by the following formula (1-2), a constitutional unit represented by the following formula (1-3), a constitutional unit represented by the following formula (1-4), and a constitutional unit represented by the following formula (1-5),

OG Complex Work Unit Chemistry
wherein, in the formula (1-2), R2 and R3 each independently represent a single bond or a C1-C10 alkylene group and X2 and X3 each independently represent a hydrogen atom, a metal atom, or a methyl group,
in the formula (1-3), R4 and R5 each independently represent a single bond or a C1-C10 alkylene group and X4 and X5 each independently represent a hydrogen atom, a metal atom, or a methyl group,
in the formula (1-4), R6 and R7 each independently represent a single bond or a C1-C10 alkylene group and X6 and X7 each independently represent a hydrogen atom, a metal atom, or a methyl group, and
in the formula (1-5), R8 represents a single bond or a C1-C10 alkylene group and X8 represents a hydrogen atom, a metal atom, or a methyl group,
the sulfonic acid group-containing constitutional unit is a constitutional unit represented by the following formula (3),

OG Complex Work Unit Chemistry
wherein, in the formula (3), R10 represents a single bond or a C1-C10 alkylene group and X9 represents a hydrogen atom, a metal atom, or a methyl group,
wherein the modified polyvinyl acetal resin comprising the hydrogen-bonding group-containing constitutional unit further comprises a hydroxyl group,
the modified polyvinyl acetal resin comprises the hydrogen-bonding group-containing constitutional unit and the hydroxyl group in a total amount of 15.4 to 61.5 mol %,
the modified polyvinyl acetal resin comprising the hydrogen-bonding group-containing constitutional unit comprises the hydrogen-bonding group-containing constitutional unit in an amount of 5.1 to 30.0 mol %,
the modified polyvinyl acetal resin comprising the hydrogen-bonding group-containing constitutional unit has an average degree of polymerization of 400 to 4,000, and
the modified polyvinyl acetal resin has an equilibrium moisture absorption of 5 to 20% by weight as measured with an infrared moisture meter after standing at 40° C. and 90% RH for seven days.