Paint coat-protecting removable pressure-sensitive adhesive sheet

Abstract

The present invention is a paint coat-protecting removable pressure-sensitive adhesive sheet comprising a base sheet, and a pressure-sensitive adhesive layer that is provided on the base sheet, the pressure-sensitive adhesive layer being formed of an emulsion pressure-sensitive adhesive composition that includes an emulsion of an ethylene-vinyl carboxylate copolymer as a main component. The present invention provides a paint coat-protecting removable pressure-sensitive adhesive sheet that does not cause swelling, whitening, and adhesive transfer even when the pressure-sensitive adhesive sheet is attached to the surface of a paint coat that has not been sufficiently dried (i.e., contains a small amount of solvent) or has not been sufficiently cured after drying, and removed from the paint coat.

1 . A paint coat-protecting removable pressure-sensitive adhesive sheet comprising a base sheet, and a pressure-sensitive adhesive layer that is provided on the base sheet, the pressure-sensitive adhesive layer being formed of an emulsion pressure-sensitive adhesive composition that includes an emulsion of an ethylene-vinyl carboxylate copolymer as a main component. 
     
     
         2 . The paint coat-protecting removable pressure-sensitive adhesive sheet according to  claim 1 , wherein the emulsion of the ethylene-vinyl carboxylate copolymer is an emulsion of (A) a copolymer obtained by subjecting a monomer mixture that includes ethylene and a vinyl carboxylate to emulsion copolymerization, or an emulsion of (B) a copolymer obtained by polymerizing an alkyl(meth)acrylate using the emulsion of the copolymer (A) as a seed emulsion. 
     
     
         3 . The paint coat-protecting removable pressure-sensitive adhesive sheet according to  claim 2 , wherein a ratio of a repeating unit derived from the copolymer (A) to a repeating unit derived from the alkyl(meth)acrylate in the copolymer (B) is 10:90 to 99:1 (mass %). 
     
     
         4 . The paint coat-protecting removable pressure-sensitive adhesive sheet according to  claim 1 , wherein a ratio of a repeating unit derived from ethylene to a repeating unit derived from the vinyl carboxylate in the ethylene-vinyl carboxylate copolymer is 10:90 to 30:70 (mass %). 
     
     
         5 . The paint coat-protecting removable pressure-sensitive adhesive sheet according to  claim 1 , wherein the vinyl carboxylate is an aliphatic vinyl carboxylate. 
     
     
         6 . The paint film-protection removable pressure-sensitive adhesive sheet according to  claim 1 , wherein the pressure-sensitive adhesive layer has a storage modulus at 23° C. of 3.0×10 5  Pa or less, and has a storage modulus at 80° C. of 4.0×10 4  Pa or less. 
     
     
         7 . The paint coat-protecting removable pressure-sensitive adhesive sheet according to  claim 2 , wherein a ratio of a repeating unit derived from ethylene to a repeating unit derived from the vinyl carboxylate in the ethylene-vinyl carboxylate copolymer is 10:90 to 30:70 (mass %). 
     
     
         8 . The paint coat-protecting removable pressure-sensitive adhesive sheet according to  claim 3 , wherein a ratio of a repeating unit derived from ethylene to a repeating unit derived from the vinyl carboxylate in the ethylene-vinyl carboxylate copolymer is 10:90 to 30:70 (mass %). 
     
     
         9 . The paint coat-protecting removable pressure-sensitive adhesive sheet according to  claim 2 , wherein the vinyl carboxylate is an aliphatic vinyl carboxylate. 
     
     
         10 . The paint coat-protecting removable pressure-sensitive adhesive sheet according to  claim 3 , wherein the vinyl carboxylate is an aliphatic vinyl carboxylate. 
     
     
         11 . The paint coat-protecting removable pressure-sensitive adhesive sheet according to  claim 4 , wherein the vinyl carboxylate is an aliphatic vinyl carboxylate. 
     
     
         12 . The paint film-protection removable pressure-sensitive adhesive sheet according to  claim 2 , wherein the pressure-sensitive adhesive layer has a storage modulus at 23° C. of 3.0×10 5  Pa or less, and has a storage modulus at 80° C. of 4.0×10 4  Pa or less. 
     
     
         13 . The paint film-protection removable pressure-sensitive adhesive sheet according to  claim 3 , wherein the pressure-sensitive adhesive layer has a storage modulus at 23° C. of 3.0×10 5  Pa or less, and has a storage modulus at 80° C. of 4.0×10 4  Pa or less. 
     
     
         14 . The paint film-protection removable pressure-sensitive adhesive sheet according to  claim 4 , wherein the pressure-sensitive adhesive layer has a storage modulus at 23° C. of 3.0×10 5  Pa or less, and has a storage modulus at 80° C. of 4.0×10 4  Pa or less. 
     
     
         15 . The paint film-protection removable pressure-sensitive adhesive sheet according to  claim 5 , wherein the pressure-sensitive adhesive layer has a storage modulus at 23° C. of 3.0×10 5  Pa or less, and has a storage modulus at 80° C. of 4.0×10 4  Pa or less.