Adhesive tape made of polyvinyl chloride and process for its production

Abstract

An adhesive tape made of polyvinyl chloride consisting essentially of a vinyl chloride resin film (hereinafter referred to as "PVC film") which contains from 5 to 60 parts by weight of inorganic fine particles having an average particle size of from 0.1 to 10 .mu.m per 100 parts by weight of the vinyl chloride resin and which has a thickness of from 50 to 200 .mu.m, and an adhesive layer formed on at least one side of PVC film, wherein a plurality of linear channels having a transverse cross section of V-shape or U-shape are formed on at least one side of the film in parallel to one another in the width direction of the adhesive tape, and, in the cross section of each channel, angles A and B which are angles of the respective opposing two inclined sides of the V-shape to the film plane, or which are angles of the tangential lines drawn at a 1/2 position in the depth of the channel on the respective opposing two curved sides of the U-shape, to the film plane, satisfy the following formulae 1 to 4: A.ltoreq.B.ltoreq.5A 1 A+B.ltoreq.110.degree. 2 10.degree..ltoreq.A.ltoreq.50.degree. 3 20.degree..ltoreq.B.ltoreq.90.degree. 4 , the depth of the channels being from 1/20 to 2/5 of the thickness of the film, and the pitch of the channels being from 50 to 300 .mu.m.

Dependencies are inferred from the claim text.