Patent ID: 6120866
Filing Date: 2000-09-19
Classification: A61F,Y10T

Abstract:
A re-peeling pressure-sensitive adhesive tape or pressure-sensitive adhesive, which can be freely adhered to an adherend and can be repeatedly adhered and re-peeled without breaking the adherend, wherein said pressure-sensitive adhesive tape or pressure-sensitive adhesive satisfies all the following conditions:(1) the average releasing force in each releasing rate in the case of releasing at a releasing rate of from 10 meters/minute to 100 meters/minute is from 50 g/25 mm to 1,000 g/25 mm,(2) the difference between the maximum value and the minimum value of the releasing force of the releasing chart pattern (the graph showing the releasing force to the change of time) obtained by the release in (1) is not larger than 2/3 of the average releasing force or not larger than 500 g/25mm,(3) the rolling initial tacking force is from 30 g/25 mm to 800 g/25 mm, and(4) the retentive force is at least 15 minutes under a load of 500 g;wherein the re-peeling pressure-sensitive adhesive tape or pressure-sensitive adhesive contains an elastomer which is a block copolymer composed of a polymer block A mainly composed of a vinyl aromatic compound and a polymer block B mainly composed of a conjugated diene compound;wherein the content of the polymer block A is at least 17% by weight and the coupling ratio is at least 50%; andwherein the increase of the adhesive force after adhering to an adherend and preserving is not more than 4 times the initial adhesive force.