Bitumen adhesive composition containing an ionomeric elastomer and waterproofing membranes comprising same
AssigneeW. R. Grace & Co.
InventorsRobert A. Wiercinski, Stephen J. Whicher
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Abstract
Bitumen-based pressure sensitive adhesive compositions are provided which comprise bitumen, oil, and an ionomeric elastomer. The adhesive compositions are useful as self adherent waterproofing layers, particularly in roofing applications. The use of the ionomeric elastomer permits formulation of the adhesive to have improved tack at the lower temperatures encountered in such application while maintaining desired flexibility, shear strength, and flow resistance. Also provided are waterproofing membranes comprising the inventive adhesive compositions.
Claims24
A pressure sensitive adhesive composition comprising bitumen, an oil which is not naturally occurring in said bitumen and is selected from the group consisting of naphthenic oils, paraffinic oils, and aromatic oils, and an ionomeric elastomer.
A pressure sensitive adhesive composition comprising bitumen, about 4 to 25 parts by weight of elastomeric neutralized sulfonated ethylene-propylene-diene terpolymer per 100 parts by weight of said bitumen, and about 40 to 90 parts by weight of an oil which is not naturally occurring in said bitumen per 100 parts by weight of said bitumen, said oil being selected from the group consisting of naphthenic oils, paraffinic oils, and aromatic oils, said bitumen having a softening point of at least about 175.degree. F. and a penetration at 40.degree. F. of at least about 30 dmm.
A waterproofing membrane comprising a waterproofing layer of a pressure sensitive adhesive composition comprising bitumen, an oil which is not naturally occurring in said bitumen and is selected from the group consisting of naphthenic oils, paraffinic oils, and aromatic oils, and an ionomeric elastomer.
Dependencies are inferred from the claim text.