Adhesive film for polarizing plate polarizing plate comprising the same and optical display apparatus comprising the same
A technology for adhesive films and polarizers, which can be used in film/sheet adhesives, optics, optical components, etc., and can solve problems such as difficulty in ensuring the surface resistance of adhesive films.
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preparation Embodiment 1
[0138] In a 1 L reactor equipped with a cooler for temperature adjustment under a nitrogen atmosphere, 69 parts by weight of n-butyl acrylate (BA, Tg in the homopolymer phase: -54°C), 1 part by weight of 4-hydroxybutyl acrylate (4-HBA, homopolymer phase Tg: -40°C), 10 parts by weight of methyl acrylate (MA, homopolymer phase Tg: 10°C), 20 parts by weight of phenoxyethyl acrylate (PEA, homopolymer phase Tg: -22° C.), and then 100 parts by weight of ethyl acetate was added thereto. After removing oxygen from the reactor by purging with nitrogen for 1 hour, the reactor was maintained at 62°C. Then, the monomer mixture was uniformly stirred, and 0.03 parts by weight of 2,2'-azobisisobutyronitrile (AIBN) was added to the reactor as a reaction initiator, and then reacted for 8 hours to prepare a compound with a weight average molecular weight of 1,690,000 g / mol of acrylic acid copolymer.
preparation Embodiment 2 to preparation Embodiment 7
[0140] An acrylic copolymer was prepared by the same method as in Preparation Example 1, except that the components of the monomer mixture were changed together with the content of AIBN as listed in Table 1 and / or the reaction time.
[0141] Details of the components used in the preparation of the acrylic copolymers of Preparation Examples 1 to 7 are shown in Table 1.
[0142] Table 1
[0143] the list BA MA t-BA IBOA 4-HBA PEA Weight average molecular weight Preparation Example 1 69 10 0 0 1 20 169×10 4
Preparation Example 2 59 20 0 0 1 20 162×10 4
Preparation Example 3 49 30 0 0 1 20 158×10 4
Preparation Example 4 59 0 20 0 1 20 172×10 4
Preparation Example 5 64 0 0 15 1 20 164×10 4
Preparation Example 6 69 30 0 0 1 0 165×10 4
Preparation Example 7 79 0 0 0 1 20 168×10 4
[0144] * In Table 1, t-BA is tert-butyl acrylate (Tg of homopolymer phas...
Embodiment 1
[0152] The (meth)acrylic copolymer (A), the isocyanate curing agent (B) of 0.5 weight part, the metal chelate curing agent (C) of 0.1 weight part ), 20 parts by weight of an antistatic agent (D) and 0.1 parts by weight of a silane coupling agent (E) were mixed to prepare a composition for an adhesive film, and then diluted to a suitable concentration with ethyl acetate.
[0153] The prepared composition was coated on a PET (polyethylene terephthalate) release film to a thickness of 15 μm, and dried at 110° C. for 4 minutes, thereby preparing a coating layer for an adhesive film.
[0154] A coating layer for an adhesive film is attached on one surface of a triacetyl cellulose film of a polarizing plate (a stack of triacetyl cellulose film / polarizer / triacetyl cellulose film bonded to each other by an adhesive, and no antistatic agent, thickness: 65 μm), and then aged at 35° C., 45% RH for 4 days, thereby preparing a polarizing plate having an adhesive film for a polarizing plate...
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