Adco Products, Inc.

Michael J Hubbard

Brian J Briddell

Dennis Keith Fisher

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 substantially equal amounts by weight of a) a rubbery polymer comprising a blend of an ethylene-propylenediene terpolymer, a halogenated butyl rubber or a halogenated copolymer of p-methylstyrene and isobutylene, and polyisobutylene b) a compatible tackifier, and c) an accelerator/cure package for the rubbery polymer. The cured composition exhibits a peel strength of at least 715 grams/cm at room temperature, at least 300 grams/cm at 70.degree. C., and supports a static load of at least 300 grams at 70.degree. C.

Adhesive composition and method for providing water-tight joints in

A solvent-based adhesive composition for adhering together roofing materials, such as synthetic EPDM rubber sheets, which provides long term storage stability is provided. The adhesive composition includes a halogenated copolymer of isobutylene and p-methyl styrene, a thermoplastic rubber comprising a styrene-ethylene-butylene-styrene block copolymer, an endblock resin for the thermoplastic rubber, a tackifier, an accelerator/cure package, and a solvent. The cured composition exhibits a peel strength of at least 3.0 pounds per lineal inch at room temperature, at least 3.0 pounds per lineal inch at 212.degree. F., supports a static load of at least 0.67 pounds at 158.degree. F. for a minimum of 24 hours, and exhibits a viscosity increase of less than 1500 centipoise after aging at 130.degree. F. for six weeks.

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Jackson, MI, United States of America

Michael J Hubbard