Adhesive and image display device using same
A technology for image display panels and adhesives, applied in adhesive types, ester copolymer adhesives, film/sheet adhesives, etc., can solve problems such as easy generation of air bubbles, and achieve height difference followability , Excellent operability
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[0036] In the preparation of the acrylic polymer, a polymerization initiator such as a photopolymerization initiator (photoinitiator) or a thermal polymerization initiator can be used according to the type of polymerization reaction. The polymerization initiator can be used alone or in combination of two or more. The amount of the photopolymerization initiator used is not particularly limited. For example, it is preferably 0.01 to 0.5 parts by weight, and more preferably 0.05 to 0.3 parts by weight with respect to 100 parts by weight of the total amount of monomer components forming the acrylic base polymer.
[0037] The molecular weight of the base polymer can be appropriately adjusted. For example, the weight average molecular weight in terms of polystyrene is about 50,000 to about 2 million, preferably about 70,000 to about 1.8 million.
[0038] In the adhesive of the present invention, the above-mentioned base polymer may have a crosslinked structure as necessary. The formatio...
Embodiment
[0067] Examples and comparative examples are listed below for further description, but the present invention is not limited to these examples.
Synthetic example 1
[0070] Put 75 parts by weight of 2-ethylhexyl acrylate (2EHA), 25 parts by weight of N-vinylpyrrolidone (NVP), 0.2 parts by weight into a separable flask equipped with a thermometer, stirrer, reflux condenser and nitrogen introduction tube. Parts by weight of azobisisobutyronitrile (AIBN) as a polymerization initiator and 233 parts by weight of ethyl acetate were then blown into nitrogen, and nitrogen replacement was performed for about 1 hour while stirring. Then, the flask was heated to 70°C and reacted for 5 hours to obtain an acrylic polymer having a weight average molecular weight (Mw) of 800,000 (hereinafter, this base polymer is referred to as "polymer 1").
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