| 摘要 |
PROBLEM TO BE SOLVED: To obtain a concrete surface hardening-retarding tape capable of easily removing a non-hardened concrete stain leaked on the surface of a tile by laminating an adhesive layer comprising a suspension polymerization type acrylic adhesive, a water-soluble polymer and a concrete hardening retarder to one surface of a synthetic resin substrate. SOLUTION: This concrete surface hardening-retarding tape is obtained by laminating an adhesive layer comprising 100 pts.wt. of a suspension polymerization type acrylic adhesive having a weight-average mol.wt. of 500,000-5,000,000, 0.5-20 pts.wt. of a water-soluble polymer and 0.05-50 pts.wt. of a concrete hardening retarder to one surface of a synthetic resin substrate. The suspension type acrylic adhesive is preferably obtained by the suspension polymerization of a vinylic monomer composition comprising 100 pts.wt. of an alkyl (meth)acrylate wherein the alkyl group has 1 to 12 carbon atoms, 1-50 pts.wt. of a vinylic monomer containing a polar group, and 0.1-20 pts.wt. of a polyfunctional vinylic monomer. Even when absorbing water and moisture, the adhesive layer is hardly swollen and scarcely causes the deterioration in the cohesive force of the adhesive.
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