ADHESIVE COMPOSITION FOR PROVIDING WATER-TIGHT JOINTS IN SINGLE-PLY ROOFING MEMBRANES

摘要

A cured adhesive tape composition for adhering together roofing materials such as synthetic EPDM rubber and which provides long term water tightness is provided. The adhesive composition includes a) a rubbery polymer comprising a blend of (i) from about 12% or less by weight of the total composition of an ethylene-propylene-diene terpolymer, (ii) a halogenated butyl rubber or a halogenated copolymer of p-methylstyrene and isobutylene, (iii) polyisobutylene, and (iv) a butyl terpolymer, and b) a compatible tackifier, and c) an accelerator/cure package for the rubbery polymer. The cured composition exhibits a peel strength of at least 1000 grams/cm at room temperature, at least 500 grams/cm at 70.degree.C, and supports a static load of at least 300 grams at 70.degree.C.