| 摘要 |
PROBLEM TO BE SOLVED: To provide an adhesive which has excellent water resistance, heat resistance, yellowing resistance, mechanical resistance and the like and sufficiently withstands long-term service. SOLUTION: The ultraviolet-curable adhesive comprises (A) a photopolymerizable oligomer, (B) a photopolymerizable monomer, (Ca) a first component of a photopolymerization initiator, and (Cb) a second component of the photopolymerization initiator, and the photopolymerization initiator of the first component (Ca) has an absorption wavelength of 240-340 nm and a molar absorption coefficient of >=90, and the photopolymerization initiator of the second component (Cb) has an absorption wavelength of 360-480 nm and a molar absorption coefficient of >=400, and the ultraviolet-curable adhesive comprises, base on 100 pts.wt. photopolymerizable oligomer (A), 0.1-900 pts.wt. photopolymerizable monomer (B), 0.01-25 pts.wt. photopolymerization initiator of the first component (Ca), and 0.001-10 pts.wt. photopolymerization initiator of the first component (Cb), and as the properties of the ultraviolet-curable adhesive before curing, the viscosity at room temperature (23 deg.C) is <=30,000 mPas; the thixotropic (TI) value is 0.5-2; and the specific gravity is 0.7-2.
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