Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Reexamination Certificate
1999-05-20
2001-01-09
Berman, Susan W. (Department: 1711)
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
C428S065200, C522S167000, C522S171000, C522S172000, C522S180000
Reexamination Certificate
active
06171675
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to an adhesive composition and, more specifically, to a UV-curable adhesive composition useful for fabricating an optical disc. The present invention also pertains to a method of preparing an optical disc using the above adhesive composition and to an optical disc produced thereby.
Various optical discs such as of a read-only (RO) type, a write-once (WO) type or a rewritable (RW) type are known. These optical discs have a transparent substrate on which an optical information recording layer is formed by, for example, sputtering or vacuum deposition of a metal or metal oxide. Recently, optical discs, such as digital video discs (DVD), having two or more recording layers were proposed. Such a multi-recording-layer optical disc is generally prepared by bonding two optical discs, each having a transparent substrate and one or more optical information recording layers, together.
One known UV-curable adhesive composition for bonding optical discs contains a polymerizable unsaturated compound, such as (meth)acrylate, and a polymerization initiator. When the optical discs to be bonded have a metal, alloy or metal oxide layer as the reflective layer, however, the known adhesive composition fails to have a satisfactory bonding strength.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a UV-curable adhesive composition suitable for bonding metal, alloy or metal oxide surfaces to each other.
Another object of the present invention is to provide a UV-curable adhesive composition suitable for bonding a metal, alloy or metal oxide surface to a plastic surface.
It is a further object of the present invention to provide a UV-curable adhesive composition of the above-mentioned type which shows a high bonding strength and which does not deteriorate a metal, alloy or metal oxide surface.
It is a special object of the present invention to provide a UV-curable adhesive composition useful for preparation of optical discs.
In accomplishing the foregoing objects, the present invention provides an adhesive composition comprising (a) a polymerizable (meth)acrylate compound having a phosphate group, (b) a thiol compound, (c) a polymerizable compound having a double bond and having no phosphate group, and (d) a photopolymerization initiator.
The present invention also provides a method of preparing an optical disc using the above adhesive composition.
The present invention further provides an optical disc having a layer of the above adhesive composition.
In the present specification, the term “(meth)acrylate” is intended to refer to “acrylate and/or methacrylate”. Similarly, the term “(meth)acrylic” is intended to mean “acrylic and/or methacrylic”.
REFERENCES:
patent: 3697395 (1972-10-01), Kehr et al.
patent: 4274933 (1981-06-01), Kamada et al.
patent: 4438190 (1984-03-01), Ishimaru et al.
patent: 4587313 (1986-05-01), Ohta et al.
patent: 4612384 (1986-09-01), Omura et al.
patent: 4657983 (1987-04-01), Skiscim
patent: 5321053 (1994-06-01), Hino et al.
patent: 5698285 (1997-12-01), Kojima
patent: 5824385 (1998-10-01), Itoigawa et al.
Berman Susan W.
Lorusso & Loud
Nagase-Ciba Ltd.
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