Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1997-12-22
2000-01-25
Seidleck, James J.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
522 96, 522 97, 522 90, 522181, 522182, 428 66, 428913, 428916, 428927, 428904, 428910, 428 56, 428 60, C08F 246, B32B 302, B32B 300
Patent
active
060176032
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an ultraviolet-curable adhesive composition, particularly to an adhesive composition for a lamination type optical disc which can be cured with an ultraviolet ray in the mutual bonding of (1) a substrate having a translucent film of an inorganic type such as gold, silver, silicon, a silicon compound or the like (referred to hereinafter as the translucent film), (2) a substrate having a metal-sputter film (referred to hereinafter as the metal sputter) of aluminum or the like and (3) a resin substrate of a polycarbonate type, a polyacrylate type, a polyvinyl type or the like and can maintain a sufficient bonding strength to the above three substrates (1) to (3).
BACKGROUND ART
In a single sided read system laminate type optical disc, a representative of which is a laminate type optical disc (referred to hereinafter as the laminate optical disc in some cases) such as DVD (digital video disc or digital versatile disc) or the like, it has heretofore been sufficient to bond (3) a resin substrate of a polycarbonate or the like to (2) a metal-sputter substrate. However, as to the laminate optical disc required to have a higher recording density, it has become an important technique to use a sheet of disc in the form of multilayer laminate. For recording information over the multilayer, it is necessary to additionally form, in addition to a conventional reflective film layer such as the metal sputter or the like, a layer composed of gold, silicon, a silicon compound or the like having functions of a reflecting layer and a light transmittable layer as a translucent film layer. That is to say, in a recent single sided read system multilayer type laminate optical disc, a representative of which is DVD-9 or DVD-18, it has been desired that the translucent film substrate (1) as well as the polycarbonate resin substrate and the metal-sputter substrate is also sufficiently laminated and bonded.
In bonding a film of gold, silver, silicon, a silicon compound or the like, the interface is inactive as compared with other inorganic matters, so that it has heretofore been considered to be difficult to impart chemical and physical actions effective to the bonding. As a result, the present situation is that no adhesive which is sufficiently satisfactory in performance and productivity has been provided for such reasons as no sufficient bonding strength being obtained in the bonding, a primer treatment being required, and the like.
With the conventional bonding method or adhesive, there are problems in respect of productivity in the optical disc lamination such as no sufficient bonding strength being obtained particularly as to the translucent film substrate (1) among the above-mentioned three substrates, a pretreatment such as a primer or the like being required, and the like, and the solution thereof has been desired.
DISCLOSURE OF INVENTION
The present inventors have eagerly made research for solving the above-mentioned problems and have consequently found that when (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 and (E) a (meth)acrylate monomer other than (A) and (B), and (F) a photopolymerization initiator are used, an ultraviolet-curable adhesive which can bond inactive substrates with a sufficient bonding strength, and have completed this invention.
That is to say, this invention relates to: 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; urethane (meth)acrylate (B) has a polyester structure, a polyether structure or a polycarbonate structure; contains (C) a (meth)acrylate monomer having a cyclic structure as the (meth)acrylate monomer (E) other than (A) and (B); contains (C) a (meth)acrylate monomer having a cyclic structure and (D) an aliphatic (meth)acrylate monomer hav
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Copy of the Australian Search Report dated Jul. 1, 1999.
Ishii Kazuhiko
Tokuda Kiyohisa
Yokoshima Minoru
Yoshida Kenji
McClendon Sanza L.
Nippon Kayaku Kabushiki Kaisha
Seidleck James J.
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