| 摘要 |
PROBLEM TO BE SOLVED: To obtain a pressure-sensitive adhesive sheet effectively made proof against the separation of the constituent pigment in a printing step by adding a polyester resin having a specified glass transition point to a base comprising a natural rubber and a pigment. SOLUTION: This sheet has a coating film of a pressure-sensitive adhesive containing a base comprising a natural rubber and a pigment and a polyester resin having a glass transition point of below 25 deg.C. Preferably, the amount of the polyester resin used is generally in the range of 5-50 pts.wt. per 100 pts.wt. natural rubber, though it depends on the types and compositions of the pressure-sensitive adhesive component and pigment used. The polyester resin used may be selected among general commercially available ones. The polyester resin is added to a natural rubber emulsion as a base, so that it is used in the form of an aqueous dispersion. The pigment used may be an organic or inorganic pigment usually used in a pressure-sensitive adhesive for a pressure- sensitive adhesive sheet. |
