Waterproofing and airtight pressure-sensitive adhesive tape

A waterproofing and airtight pressure-sensitive adhesive tape comprising a substrate having a butyl rubber-based pressure-sensitive adhesive layer on one side thereof, wherein the substrate is a sheet made of an unvulcanized rubber containing a butyl rubber;

• a film layer having non-self-adhesive properties and adhesive properties to the pressure-sensitive adhesive layer comprising a polybutyl methacrylate or an octadecyl methacrylate-acrylonitrile copolymer is formed on the substrate in the side opposite to the pressure-sensitive adhesive layer;
• and the waterproofing and airtight pressure-sensitive adhesive tape has an elongation at break under conditions of a distance between two gage marks of 40 mm and a drawing rate of 300 mm/min of from 200 to 1,200% in both the longitudinal direction and the cross direction and a stress under 100% elongation under conditions of a distance between two gage marks of 40 mm and a drawing rate of 50 mm/min of from 10 to 100 N/cm2 in both the longitudinal direction and the cross direction.