US 12,319,783 B2
Cycloolefin polymer, method for producing same, and optical element
Hironari Sudeji, Tokyo (JP)
Assigned to ZEON CORPORATION, Tokyo (JP)
Appl. No. 17/755,727
Filed by ZEON CORPORATION, Tokyo (JP)
PCT Filed Nov. 26, 2020, PCT No. PCT/JP2020/044086
§ 371(c)(1), (2) Date May 6, 2022,
PCT Pub. No. WO2021/107041, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 2019-217426 (JP), filed on Nov. 29, 2019.
Prior Publication US 2023/0002544 A1, Jan. 5, 2023
Int. Cl. C08G 61/08 (2006.01); G02B 1/04 (2006.01)
CPC C08G 61/08 (2013.01) [G02B 1/04 (2013.01); C08G 2261/3324 (2013.01); C08G 2261/418 (2013.01)] 10 Claims
 
1. A cycloolefin polymer that is a ring-opened polymer or a hydrogenated product thereof, said polymer comprising a structural unit derived from a naphthyl group-containing alicyclic compound (A) represented by following formula (1):

OG Complex Work Unit Chemistry
where any one of R2a to R5a is a naphthyl group and remaining groups among R2a to R5a and R1a are each independently:
(i) a hydrogen atom;
(ii) a halogen atom; or
(iii) a substituted or unsubstituted hydrocarbon group having a carbon number of 1 to 30 and optionally having a linking group comprising an oxygen atom, a nitrogen atom, a sulfur atom or a silicon atom, except for the hydrocarbon group comprising an aromatic ring; and
a structural unit derived from at least one norbornene-based monomer (B) different from the compound (A),
wherein the norbornene-based monomer (B) comprises:
(i) a norbornene that is unsubstituted or has an alkyl group, an alkenyl group, an aromatic ring group, or a nitrogen atom-containing polar group as a substituent;
(ii) a monomer indicated by following formula (3):

OG Complex Work Unit Chemistry
where
R1b and R2b each independently represent a hydrogen atom; a halogen atom; a hydrocarbon group having a carbon number of 1 to 20 and optionally having a substituent; or an organic group comprising a silicon atom or a nitrogen atom,
R1b and R2b are optionally bonded to each other to form a ring, and
R3b is a divalent hydrocarbon group having a carbon number of 1 to 20 and optionally having a substituent; or
(iii) a monomer indicated by following formula (4):

OG Complex Work Unit Chemistry
where
R4b to R7b each independently represent a hydrogen atom; a halogen atom; a hydrocarbon group having a carbon number of 1 to 20 and optionally having a substituent; or an organic group comprising a silicon atom or a nitrogen atom,
R4b and Rob are optionally bonded to each other to form a ring, and
m is 1 or 2,
wherein the proportion of the structural unit derived from said compound (A) among all structural units is not less than 20 mol % and not more than 100 mol %, and
wherein the cycloolefin polymer has a weight-average molecular weight of not less than 18,000 and not more than 100,000.