US 12,378,354 B2
Active ester resin, method for producing thereof, epoxy resin composition, cured product thereof, prepreg, laminated board, and material for circuit substrate
Masahiro Soh, Tokyo (JP); Kazuo Ishihara, Tokyo (JP); Jin Soo Lee, Seoul (KR); Chan Ho Park, Seoul (KR); and Joong Hwi Jee, Seoul (KR)
Assigned to NIPPON STEEL Chemical & Material Co., Ltd., Tokyo (JP); and KUKDO CHEMICAL CO., LTD., Seoul (KR)
Appl. No. 17/798,893
Filed by NIPPON STEEL Chemical & Material Co., Ltd., Tokyo (JP); and KUKDO CHEMICAL CO., LTD., Seoul (KR)
PCT Filed Feb. 4, 2021, PCT No. PCT/JP2021/004188
§ 371(c)(1), (2) Date Aug. 11, 2022,
PCT Pub. No. WO2021/166669, PCT Pub. Date Aug. 26, 2021.
Claims priority of application No. 2020-024357 (JP), filed on Feb. 17, 2020.
Prior Publication US 2023/0097650 A1, Mar. 30, 2023
Int. Cl. C08G 63/64 (2006.01); C08G 59/42 (2006.01); C08G 63/183 (2006.01); C08G 63/19 (2006.01); C08G 63/199 (2006.01); C08G 63/682 (2006.01); C08J 5/18 (2006.01); C08J 5/24 (2006.01); C08L 63/04 (2006.01); H05K 1/03 (2006.01)
CPC C08G 63/64 (2013.01) [C08G 59/4276 (2013.01); C08G 63/183 (2013.01); C08G 63/19 (2013.01); C08G 63/199 (2013.01); C08G 63/682 (2013.01); C08J 5/18 (2013.01); C08J 5/24 (2013.01); C08L 63/04 (2013.01); H05K 1/0313 (2013.01); C08L 2203/206 (2013.01)] 11 Claims
 
1. An active ester resin having a polyaryloxy unit containing a dicyclopentenyl group and represented by the following formula (1), and a polyarylcarbonyl unit:

OG Complex Work Unit Chemistry
wherein each R1 independently represents a hydrocarbon group having 1 to 8 carbon atoms, each R2 independently represents a hydrogen atom, or a dicyclopentenyl group represented by the following formula (1a) or formula (1b), and at least one R2 is the dicyclopentenyl group; represents the number of repetitions and an average value thereof is a number of 1 to 5; and “*” is a linking site bonded to a carbonyl group of the polyarylcarbonyl unit,

OG Complex Work Unit Chemistry