US 11,860,472 B2
Solvent-free photo-curable resin composition for polarizing plate protective layer, polarizing plate comprising cured product thereof, and image display device
Mi So Lee, Daejeon (KR); Yoonkyung Kwon, Daejeon (KR); and Sanghun Han, Daejeon (KR)
Assigned to SHANJIN OPTOELECTRONICS (SUZHOU) CO., LTD., Zhangjiagang (CN)
Appl. No. 16/646,029
Filed by SHANJIN OPTOELECTRONICS (SUZHOU) CO., LTD., Zhangjiagang (CN)
PCT Filed Sep. 20, 2018, PCT No. PCT/KR2018/011188
§ 371(c)(1), (2) Date Mar. 10, 2020,
PCT Pub. No. WO2019/059693, PCT Pub. Date Mar. 28, 2019.
Claims priority of application No. 10-2017-0122715 (KR), filed on Sep. 22, 2017.
Prior Publication US 2020/0292876 A1, Sep. 17, 2020
Int. Cl. G02F 1/1335 (2006.01); C08F 2/50 (2006.01); C08F 20/18 (2006.01); C08G 18/81 (2006.01); G02B 5/30 (2006.01); C08G 18/10 (2006.01); C08K 3/013 (2018.01); C08K 5/00 (2006.01); G02F 1/1334 (2006.01)
CPC G02F 1/133528 (2013.01) [C08F 2/50 (2013.01); C08F 20/18 (2013.01); C08G 18/10 (2013.01); C08G 18/8175 (2013.01); G02B 5/30 (2013.01); G02B 5/3016 (2013.01); C08K 3/013 (2018.01); C08K 5/005 (2013.01); C08K 5/0016 (2013.01); C09K 2323/03 (2020.08); C09K 2323/031 (2020.08); C09K 2323/035 (2020.08); C09K 2323/05 (2020.08); C09K 2323/057 (2020.08); G02F 1/1334 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A solvent-free photocurable resin composition for a polarizing plate protective layer comprising:
an acryl-based resin comprising (1) a first structure unit derived from a first acrylate-based monomer; (2) a second structure unit derived from a second acrylate-based monomer having hydroxyl crosslinking groups; and (3) unpolymerized monomers selected from a group consisting of the first acrylate-based monomer, the second acrylate-based monomer, and combinations thereof, thereby producing the acryl-based resin with a degree of partial polymerization, wherein the first structure unit and the second structure unit were partially co-polymerized, in the absence of a photoinitiator, the first structure unit being included in 98 parts by weight and the second structure unit being included in 2 parts by weight when the first structure unit and the second structure unit were partially co-polymerized; and
an acrylate-based isocyanate crosslinking agent, wherein the acrylate-based isocyanate crosslinking agent is included in 10 parts by weight to 20 parts by weight with respect to 100 parts by weight of the acryl-based resin;
wherein the degree of partial polymerization is selected such that the solvent-free photocurable resin composition has a viscosity at 25° C. of greater than or equal to 50 cPs and less than or equal to 300 cPs while having a solid content of 99.7% or higher;
wherein the first structure unit is iso-bornyl acrylate (IBOA), the second structure unit is 4-hydroxylbutyl acrylate (4-HBA) and the acrylate-based isocyanate crosslinking agent is 2-isocyanatoethyl acrylate (AOI).