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US 12,552,976 B2Granted
Adhesive composition and adhesive sheet using the same
AssigneeDongwoo Fine-Chem Co., Ltd.
InventorsKyoungmoon Jung, Hyerim Kwon, Inoh Hwang
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Abstract
An adhesive composition contains a urethane oligomer, a diluent monomer and a photoinitiator, in which a weight ratio of heteroatoms in the diluent monomer is adjusted, and a dielectric constant and a dielectric tangent at 15 GHz of an adhesive layer having a thickness of 150 μm after curing are controlled to be within a specific range. The adhesive composition exhibits low dielectric properties suitable for use in an image display device requiring a high frequency band or thinned.
Claims6
An adhesive composition comprising a urethane oligomer, a diluent monomer and a photoinitiator, wherein
- the urethane oligomer has a backbone selected from the group consisting of polyethylene, polypropylene, polybutadiene, polyisoprene, hydrogenated polybutadiene, hydrogenated polyisoprene, and combinations thereof, and has a radically polymerizable functional group on at least one end,
- the urethane oligomer is contained in an amount of 5 to 50 parts by weight based on 100 parts by weight of the diluent monomer,
- the diluent monomer contains a (meth)acrylic monomer having an aliphatic hydrocarbon group having 10 or more carbon atoms in an amount of 20 to 40% by weight based on 100% by weight of the total monomers,
- a weight ratio of heteroatoms in the diluent monomer is 12.2 to 16.0%,
- a dielectric constant at 15 GHz of an adhesive layer having a thickness of 150 μm after curing is less than 2.5, and
- a dielectric tangent at 15 GHz of the adhesive layer having a thickness of 150 μm after curing is 0.015 or less.
3 more elements
Dependencies are inferred from the claim text.