Radical curable adhesive composition, and polarizing plate and optical member comprising same

Preparation of Acryl-based Protective Film

[0089]Raw material pellets were prepared by supplying a resin composition obtained by uniformly mixing poly(N-cyclohexylmaleimide-co-methylmethacrylate), a styrene-maleic anhydride copolymer resin and a phenoxy-based resin in a weight ratio of 100:2.5:5 to a 24φ extruder substituted with nitrogen from a raw material hopper to an extruder, and melting the result at 250° C.

[0090]As the phenoxy-based resin, PKFE (Mw=60,000, Mn=16,000, Tg=95° C.) manufactured by InChem Corporation (InChemRez) was used. As the styrene-maleic anhydride copolymer resin, Dylaeck 332 that is 85% by weight of styrene and 15% by weight of maleic anhydride was used, and as the poly(N-cyclohexylmaleimide-co-methylmethacrylate) resin, a compound having the N-cyclohexylmaleimide content in 6.5% by weight when analyzed using an NMR was used.

[0091]The obtained raw material pellets were vacuum dried, were melted at 260° C. using an extruder, then passed through a coat-hanger-typ

Preparation of Adhesive Composition

[0093](1) Adhesive Composition A

[0094]Adhesive Composition A for a polarizing plate was prepared by adding 3 parts by weight of irgacure-819 (manufactured by Ciba Specialty Chemicals Inc.), a radical initiator, to 100 parts by weight of a resin composition prepared by adding glyceryl monoacrylate (GLA) in 64.5% by weight, hydroxyethyl acrylate (HEA) in 16.1% by weight, dimethylol tricyclodecane diacrylate (DCPDA) in 16.1% by weight and di-(methacryloyloxy ethyl)phosphate in 3.3% by weight.

[0095](2) Adhesive Composition B

[0096]Adhesive Composition B for a polarizing plate was prepared by adding 3 parts by weight of irgacure-819 (manufactured by Ciba Specialty Chemicals Inc.), a radical initiator, to 100 parts by weight of a resin composition prepared by adding glyceryl monoacrylate (GLA) in 56.5% by weight, hydroxyethyl acrylate (HEA) in 24.2% by weight, dimethylol tricyclodecane diacrylate (DCPDA) in 16.1% by weight and di-(methacryloyloxy ethyl)phosp

[0125]The Adhesive Composition A was applied on the primer layer of the acrylic film-based protective film prepared in Preparation Example 1 using a dropping pipette, and the result was laminated on both surfaces of a polarizer (PVA element), and then the result passed through a laminator (5 m / min) after setting the condition of the adhesive layer to have a final thickness of 1 to 2 μm. Next, ultraviolet rays of 1000 mJ / cm2 irradiated on the surface laminated with the acrylic film using a UV irradiator (metal halide lamp), and as a result, a polarizing plate was prepared. Meanwhile, the polarizing plate was prepared under a condition of a temperature of 20° C. and humidity of 50%.