Ultraviolet-curing adhesive composition and article
AssigneeNippon Kayaku Kabushiki Kaisha
InventorsKiyohisa Tokuda, Kenji Yoshida, Kazuhiko Ishii, Minoru Yokoshima
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Abstract
An ultraviolet-curable adhesive composition which comprises (A) a bisphenol type epoxy (meth)acrylate having a molecular weight of 450 to 3,000, (B) a urethane (meth)acrylate having a molecular weight of 400 to 10,000, (E) a (meth)acrylate monomer other than (A) and (B), and (F) a photopolymerization initiator, and an article having a cured layer of the above adhesive composition.
Claims6
A DVD having a layer composed of a cured product of the ultraviolet-curable adhesive composition which comprises (A) a bisphenol epoxy (meth)acrylate having a molecular weight of 450 to 3,000, (B) a urethane (meth)acrylate having a molecular weight of 400 to 10,000, (E) a (meth)acrylate monomer other than (A) and (B), and (F) a photo polymerization initiator;
- wherein said (meth)acrylate (E) other than (A) and (B) comprises (C) a (meth)acrylate monomer having a cyclic structure;
- as the nonvolatile matter in the ultraviolet-curable adhesive, the bisphenol epoxy (meth)acrylate (A) having a molecular weight of 450 to 3,000 is present in an amount of 5 to 70% by weight, the urethane (meth)acrylate (B) having a molecular weight of 400 to 10,000 is present in an amount of 5 to 60% by weight, the (meth)acrylate monomer (E) other than (A) and (B) is present in an amount of 10 to 80% by weight, and the photopolymerization initiator (F) is present in an amount of 3 to 20% by weight;
- and
- said photolpolymerization initiator has an absorption wave length of not less than 360 nm but not more than 450 nm and a molar extinction coefficient of not less than 400.
Dependencies are inferred from the claim text.