US 11,981,775 B2
Branched copolymer, and photosensitive resin composition, photosensitive resin film and optical device using the same
Bethy Kim, Daejeon (KR); Da Jung Kim, Daejeon (KR); Young Jee Song, Daejeon (KR); and Dongmin Jeong, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 16/633,782
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jun. 5, 2019, PCT No. PCT/KR2019/006822
§ 371(c)(1), (2) Date Jan. 24, 2020,
PCT Pub. No. WO2019/245200, PCT Pub. Date Dec. 26, 2019.
Claims priority of application No. 10-2018-0071580 (KR), filed on Jun. 21, 2018.
Prior Publication US 2020/0207918 A1, Jul. 2, 2020
Int. Cl. C08G 73/14 (2006.01); C08G 73/10 (2006.01); G02B 1/04 (2006.01); G03F 7/038 (2006.01)
CPC C08G 73/14 (2013.01) [C08G 73/101 (2013.01); C08G 73/106 (2013.01); G02B 1/04 (2013.01); G03F 7/0387 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A branched copolymer comprising:
a branched amide functional group represented by Chemical Formula 1-1; and
a polyimide block bonded to a terminal of the branched amide functional group:

OG Complex Work Unit Chemistry
wherein, in the Chemical Formula 1,
A1 is an organic group represented by Chemical Formula 2, and
L2 to L5 are the same as or different from each other, and are each independently a divalent functional group, and
wherein the divalent functional group is an alkylene group having 35 to 100 carbon atoms; or a polysiloxanylene group having 5 to 100 carbon atoms:

OG Complex Work Unit Chemistry
wherein, in the Chemical Formula 2, Y is any one selected from the group consisting of a direct bond, —O—, —CO—, —COO—, —S—, —SO—, —SO2—, —CR7R8—, —(CH2)t—, —O(CH2)tO—, —COO(CH2)tOCO—, —CONH—, phenylene, and a combination thereof, wherein R1 to R8 are each independently hydrogen, or an alkyl group or a haloalkyl group having 1 to 10 carbon atoms, and tis an integer of 1 to 10.