RETROREFLECTION SHEET HAVING SWELL RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a retroreflection sheet which has superior swell resistance continuously during and after sticking operation while maintaining adhesive strength after the sticking. SOLUTION: When the retroreflection sheet having an adhesive layer which has adhesive projections without forming the same plane so that the adhesive projections projecting from the same plane are of 10 to 70 μm in height and have a >=1,000 minutes holding force at a 60 deg.C atmosphere is stuck on a bonded body, gaps which communicate with the outside air are not only formed between the bonded body and adhesive layer, but also held even after the sticking.