| 摘要 |
PROBLEM TO BE SOLVED: To enable to hide information by such a weak pressure that is at a level of rubbing by a hand without requiring a large scale press-contacting apparatus. SOLUTION: An information hiding postcard has a postcard piece 1 with an information entering region 2, a hiding piece 3 connected to one side of the postcard piece 1 and hiding at least information entering region 2, an adhesive layer consisting of a first adhesive layer 4 formed along a side opposing to a side connected to at least the postcard piece 1 of the hiding piece 3, and a second adhesive layer 5 formed at a position opposing to the first adhesive layer 4 of the postcard piece 1, and a false adhesive layer 6 formed in a region other than the adhesive layer forming region of at least one of the postcard piece 1 and the hiding piece 3. In the information hiding postcard, the adhesive layer is a layer prepared by applying and forming a pressure-sensitive adhesive composition comprising an acrylic-modified natural rubber latex, a peroxide non-vulcanized latex and a synthetic rubber latex. COPYRIGHT: (C)2007,JPO&INPIT
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