| 摘要 |
PROBLEM TO BE SOLVED: To obtain an adhesive which firmly bonds a surface made of a metal or a metal compound by mixing a phosphoric acid (meth)acrylate compound with a thiol compound. SOLUTION: There is provided a liquid adhesive comprising a mixture of 50-90 wt.% polyfunctional (meth)acrylate with a monofunctional (meth)acrylate; 0.1-5 wt.% phosphoric acid (meth)acrylate compound; a thiol compound in an amount to give 0.3-10 mol of mercapto groups per mol of the phosphoric hydroxyl groups; and 0.1-10 wt.% polymerization initiator such as benzophenone and having a viscosity of 20-2,000 cP at 25 deg.C. Discs are bonded by interposing an adhesive layer having a thickness of 5-80 μm between the discs, and setting the adhesive layer under the influence of pressure and ultraviolet rays. The phosphoric acid (meth)acrylate compound is a phospho-containing compound represented by any one of formulas I to IV. The thiol compound used is exemplified by methyl mercaptopropionate or a compound represented by formula V (wherein R<1> is -C2 H4 OCOC2 H4 SH). |
