US 9,809,751 B2
Liquid crystal photo-alignment agent, liquid crystal photo-alignment film manufactured using the same, method of manufacturing the same, and liquid crystal display including liquid crystal photo-alignment film
Suk Hoon Kang, Seoul (KR); Jin-Soo Jung, Hwaseong-si (KR); Jun Woo Lee, Seongnam-si (KR); Jong Hwan Jeon, Gwangju-si (KR); In Ok Kim, Osan-si (KR); and Baek Kyun Jeon, Yongin-si (KR)
Assigned to Samsung Display Co., Ltd., Yongin-si (KR)
Filed by Samsung Display Co., Ltd., Yongin-si (KR)
Filed on Jan. 15, 2016, as Appl. No. 14/996,960.
Claims priority of application No. 10-2015-0020919 (KR), filed on Feb. 11, 2015.
Prior Publication US 2016/0230095 A1, Aug. 11, 2016
Int. Cl. C08G 73/10 (2006.01); C09K 19/56 (2006.01); G02F 1/1337 (2006.01)
CPC C09K 19/56 (2013.01) [C08G 73/1075 (2013.01); G02F 1/133723 (2013.01); G02F 1/133788 (2013.01); C08G 73/1042 (2013.01); Y10T 428/1005 (2015.01)] 9 Claims
 
1. A liquid crystal photo-alignment agent, comprising:
a polyimide copolymer comprising a first structure unit represented by Chemical Formula 1 and a second structure unit represented by Chemical Formula 2,
wherein the first structure unit comprises 80 to 90 mole % and the second structure unit comprises 10 to 20 mole %, based on 100 mole % sum total of the first structure unit and the second structure unit,

OG Complex Work Unit Drawing
wherein in Chemical Formulas 1 and 2:
X1 is a tetravalent organic group selected from Chemical Formula 1A,
X2 is a tetravalent organic group of Chemical Formula 2A, and
Y1 and Y2 are divalent organic groups induced from aromatic diamine,

OG Complex Work Unit Drawing
wherein in Chemical Formula 1A:
R6 and R7 are each independently selected from hydrogen, a halogen, a substituted or unsubstituted C1 to C20 alkyl group, and a combination thereof,
a is an integer of 0 to 2,
b is an integer of 0 to 3, and
where b is 2 or more, each R7 of a plurality of R7s is the same or different from the others and each R7 of a plurality of R7s is connected to the others to form a fused ring fused with a cyclohexyl group, and

OG Complex Work Unit Drawing
wherein in Chemical Formula 2A:
R11 and R12 are each independently selected from hydrogen, a halogen, a substituted or unsubstituted C1 to C20 alkyl group, and a combination thereof, and
wherein the polyimide copolymer has a weight average molecular weight of 10,000 to 300,000 g/mol.