A transparent acrylic pressure-sensitive adhesive composition which combines
transparency
and high-temperature adhesive properties. The transparent pressure-sensitive adhesive
composition contains a polymer of one or more acrylic-based monomers and an organophilic
layered clay mineral dispersed therein, wherein part of the polymer has been intercalated
between layers of the clay mineral to cause interlayer separation and the clay
mineral has a layer-to-layer distance of 100 or longer. It is produced
by a process which includes: mixing 100 parts by weight of the monomers with 10
to 150 parts by weight of an organophilic layered clay mineral and 0.005 to 5 parts
by weight of a polymerization initiator together with an organic solvent; exerting
an external action on this mixture to thereby intercalate part of the monomers,
polymerization initiator, and organic solvent into interstices of the organophilic
layered clay mineral; subsequently removing the solvent; and then polymerizing
the monomers.
