| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a tacky-adhesive sheet having an ultraviolet-curable acrylic tacky adhesive layer, in which method polymerization can be carried out at a high speed, which method is excellent in productivity and which sheet has tacky-adhesive performance such as retention force well-balancedly at high temperature.SOLUTION: The method for producing the tacky-adhesive sheet having the ultraviolet-curable acrylic tacky adhesive layer comprises the steps of: applying an ultraviolet-curable acrylic tacky adhesive composition, which contains, at the least, a monomer component containing alkyl (meth)acrylate and/or a partially-polymerized product of the monomer component and a photopolymerization initiator, to a base material; and irradiating the composition-applied base material with ultraviolet light to cure the ultraviolet-curable acrylic tacky adhesive composition and form the tacky adhesive layer. The step to form the tacky adhesive layer comprises: a first irradiation step of exposing the ultraviolet-curable acrylic tacky adhesive composition to the light from an LED lamp, which is an ultraviolet light source and has the peak wavelength at 300-450 nm; and a second irradiation step of exposing the firstly-exposed ultraviolet-curable acrylic tacky adhesive composition to the light from an ultraviolet lamp, which is another ultraviolet light source and has the peak wavelength at 300-450 nm. The rate of polymerization of the monomer component is 50% or more after the first irradiation step is carried out. |
