| 摘要 |
PROBLEM TO BE SOLVED: To raise damp-proofing to improve reliability and productivity by adhering a key pad made of silicone rubber to a resin key top through an adhesive formed with a photo-curing resin in which a silane compound is contained in a prescribed ratio. SOLUTION: An adhesive for the key pad of silicone rubber having good weatherproofing, heat resistance, precise moldability, electric insulation, and the like, favorably contains silane compound, shown in the formula, of 0.1-20 pts.wt. in photo-curing resin of 100 pts.wt. By improvement of adhesion, the use of an ABS resin or the like of low softening point, quickening of adhesion, and prevention of dislocation are realized, and damp-proofing is improved. It is ideal to process a part of the connecting part of the key pad by shorter wavelength ultraviolet irradiation, corona discharge, flame, or plasma, and the adhesion becomes strong. in the formula, R1: vinyl group, methacryl group, acryl group, epoxy group, R2: chlorine, carbon number 1-6 of alkoxy group, 2-methoxy-ethoxy group, acetoxy group; R3: methyl group, ethyl group; at n=1, m=2 or 3, at n=2, m=2}.
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