Double-faced pressure-sensitive adhesive tape

Abstract

Disclosed is a double-faced pressure-sensitive adhesive tape which includes a foam substrate, one pressure-sensitive adhesive layer arranged on or above one side of the substrate, and another pressure-sensitive adhesive layer arranged on or above the other side of the substrate. The adhesive tape has a total thickness of 250 μm or less. The adhesive tape is thin but highly waterproof (sealable against water). The adhesive tape preferably has a tensile strength of 0.5 to 20 MPa for further superior processability.

1 . A double-faced pressure-sensitive adhesive tape comprising a foam substrate; one pressure-sensitive adhesive layer arranged on or above one side of the substrate; and another pressure-sensitive adhesive layer arranged on or above the other side of the substrate, wherein each of the pressure sensitive adhesive layers contain an acrylic polymer as a base polymer wherein an amount of C 1-20  alkyl (meth)acrylates is 60 percent by weight or more based on a total amount of monomer components constituting the acrylic polymer, an expansion ratio of the foam substrate is from 2.5 to 25.0 cc/g, and the double-faced pressure-sensitive adhesive tape has a total thickness of 250 micrometers (μm) or less. 
     
     
         2 . The double-faced pressure-sensitive adhesive tape according to  claim 1 , wherein the double-faced pressure-sensitive adhesive tape has a tensile strength of from 0.5 to 20 megapascals (MPa). 
     
     
         3 . The double-faced pressure-sensitive adhesive tape according to  claim 1 , wherein the double-faced pressure-sensitive adhesive tape has an elongation of from 100% to 600%. 
     
     
         4 . The double-faced pressure-sensitive adhesive tape according to  claim 1 , wherein the total thickness of the pressure-sensitive adhesive layers arranged on both sides of the substrate is from 10 to 170 μm. 
     
     
         5 . The double-faced pressure-sensitive adhesive tape according to  claim 1 , wherein the double-faced pressure-sensitive adhesive tape has a compression load by 30% of from 5 to 200 kilopascals (kPa). 
     
     
         6 . The double-faced pressure-sensitive adhesive tape according to  claim 1 , wherein the double-faced pressure-sensitive adhesive tape has a push out force of from 30 to 200 newtons (N). 
     
     
         7 . The double-faced pressure-sensitive adhesive tape according to  claim 1 , wherein the foam substrate is a halogen-free foam substrate containing substantially no halogen compound by design. 
     
     
         8 . The double-faced pressure-sensitive adhesive tape according to  claim 1 , wherein the double-faced pressure-sensitive adhesive tape shows a chlorine-containing gas emission of 50 micrograms per gram (μg/g) or less. 
     
     
         9 . The double-faced pressure-sensitive adhesive tape according to  claim 1 , wherein the foam substrate is colored black. 
     
     
         10 . The double-faced pressure-sensitive adhesive tape according to  claim 9 , wherein the double-faced pressure-sensitive adhesive tape has a visible-light transmittance of 15% or less. 
     
     
         11 . The double-faced pressure-sensitive adhesive tape according to  claim 1 , wherein the foam substrate is colored white. 
     
     
         12 . The double-faced pressure-sensitive adhesive tape according to  claim 11 , wherein the double-faced pressure-sensitive adhesive tape has a visible-light reflectance of 20% or more. 
     
     
         13 . The double-faced pressure-sensitive adhesive tape according to  claim 1 , for use in an optical component. 
     
     
         14 . The double-faced pressure-sensitive adhesive tape according to  claim 1 , for waterproofing use. 
     
     
         15 . The double-faced pressure-sensitive adhesive tape according to  claim 1 , for the application to an adherend having an uneven face and/or curved face. 
     
     
         16 . The double-faced pressure-sensitive adhesive tape according to  claim 2 , wherein the double-faced pressure-sensitive adhesive tape has an elongation of from 100% to 600%. 
     
     
         17 . The double-faced pressure-sensitive adhesive tape according to  claim 2 , wherein the total thickness of the pressure-sensitive adhesive layers arranged on both sides of the substrate is from 10 to 200 μm. 
     
     
         18 . The double-faced pressure-sensitive adhesive tape according to  claim 2 , wherein the double-faced pressure-sensitive adhesive tape has a compression load by 30% of from 5 to 200 kilopascals (kPa). 
     
     
         19 . The double-faced pressure-sensitive adhesive tape according to  claim 2 , wherein the double-faced pressure-sensitive adhesive tape has a push out force of from 30 to 200 newtons (N). 
     
     
         20 . The double-faced pressure-sensitive adhesive tape according to  claim 1 , wherein the expansion ratio of the foam substrate is from 2.5 to 3.1 cc/g.