US 11,787,985 B2
Adhesive film for polarizing plates, polarizing plate including the same and optical display including the same
Mi Yeon Yu, Suwon-si (KR); Seung Jun Lee, Suwon-si (KR); Woo Jin Jeong, Suwon-si (KR); Ha Yun Cho, Suwon-si (KR); and Il Jin Kim, Suwon-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Filed by SAMSUNG SDI CO., LTD., Yongin-si (KR)
Filed on Mar. 3, 2021, as Appl. No. 17/190,772.
Claims priority of application No. 10-2020-0032268 (KR), filed on Mar. 16, 2020.
Prior Publication US 2021/0284878 A1, Sep. 16, 2021
Int. Cl. C09J 133/12 (2006.01); G02B 5/30 (2006.01); C09J 7/29 (2018.01); C09J 7/30 (2018.01); C09J 11/06 (2006.01); C09J 133/10 (2006.01); C09J 133/08 (2006.01)
CPC C09J 133/12 (2013.01) [C09J 7/29 (2018.01); C09J 7/30 (2018.01); C09J 11/06 (2013.01); G02B 5/305 (2013.01); B32B 2307/40 (2013.01); B32B 2307/42 (2013.01); B32B 2307/71 (2013.01); B32B 2457/20 (2013.01); B32B 2457/206 (2013.01); C09J 133/08 (2013.01); C09J 133/10 (2013.01); C09J 2203/318 (2013.01); C09K 2323/057 (2020.08)] 16 Claims
OG exemplary drawing
 
1. An adhesive film for polarizing plates formed of an adhesive composition comprising: a (meth)acrylic copolymer; an adhesion promoter; a mixture of an isocyanate curing agent and a carbodiimide curing agent; and a UV absorbent, wherein
the adhesive film has a glass transition temperature of about −47° C. to about −40° C.,
the adhesive film has a light transmittance of about 3% or less at a wavelength of about 380 nm,
the adhesion promoter comprises an aromatic modified terpene resin having a glass transition temperature of about 90° C. or more,
the adhesive film for polarizing plates has a peel strength of about 700 gf/inch to 1200 gf/inch with respect to a glass plate at about 25° C., and has a creep of about 100 μm or less at about 25° C., and
in the mixture of the isocyanate curing agent and the carbodiimide curing agent, a weight ratio of the isocyanate curing agent to the carbodiimide curing agent is about 2:1 to about 150:1.