US 11,952,460 B2
Polycarbonate resin, method for producing the same, and optical lens
Munenori Shiratake, Ibaraki (JP); Kentaro Ishihara, Tokyo (JP); Koji Hirose, Tokyo (JP); Shinya Ikeda, Tokyo (JP); Noriyuki Kato, Tokyo (JP); Mitsuteru Kondo, Tokyo (JP); Shoko Suzuki, Tokyo (JP); Kensuke Oshima, Tokyo (JP); and Shuya Nagayama, Tokyo (JP)
Assigned to MITSUBISHI GAS CHEMICAL COMPANY, INC., Tokyo (JP)
Filed by MITSUBISHI GAS CHEMICAL COMPANY, INC., Tokyo (JP)
Filed on Jul. 29, 2022, as Appl. No. 17/877,193.
Application 17/877,193 is a continuation of application No. 16/641,930, granted, now 11,434,327, previously published as PCT/JP2018/031880, filed on Aug. 29, 2018.
Claims priority of application No. 2017-165198 (JP), filed on Aug. 30, 2017.
Prior Publication US 2022/0380532 A1, Dec. 1, 2022
Int. Cl. C08G 64/06 (2006.01); C08G 64/30 (2006.01); G02B 1/04 (2006.01)
CPC C08G 64/06 (2013.01) [C08G 64/302 (2013.01); G02B 1/041 (2013.01)] 33 Claims
 
1. A polycarbonate resin, comprising a structural unit expressed by general formula (1) below:

OG Complex Work Unit Chemistry
(where R1 and R2 independently represent a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom an iodine atom, an alkyl group having a carbon number of 1 to 6, a mono- or polycyclic aryl group having a carbon number of 6 to 36, a mono- or polycyclic hetaryl having a total of 5 to 36 atoms, which are ring members, where 1, 2, 3 or 4 of these atoms are selected from nitrogen, sulfur and oxygen, while the remainder of these atoms are carbon atoms, an alkenyl group having a carbon number of 2 to 6, an alkoxy group having a carbon number of 1 to 6, or an aralkyl group having a carbon number of 7 to 17,
where the mono- or polycyclic aryl and mono- or polycyclic hetaryl are unsubstituted or carry 1 or 2 radicals Ra, which are selected from the group consisting of CN, CH3, OCH3, O-phenyl, O-naphthyl, S-phenyl, S-naphthyl and halogen,
where R1 and R2 do not all represent a hydrogen atom;
X represents an alkylene group having a carbon number of 1 to 8, a cycloalkylene group having a carbon number of 5 to 12 or an arylene group having a carbon number of 6 to 20;
where alkylene group and cycloalkylene group are unsubstituted or carry a phenyl ring, and
a and b each represent an integer of 1 to 10),
wherein the refractive index (nD) of the polycarbonate resin at 23° C. at a wavelength of 589 nm is 1.635 or higher.