Bitumen adhesive and waterproofing membranes containing same
AssigneeW. R. Grace & Co.
InventorsRobert A. Wiercinski, Stephen J. Whicher
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Abstract
Pressure sensitive bitumen-based adhesive compositions are provided which comprise bitumen, oil, an ionomeric elastomer, and gilsonite. The adhesives are particularly useful as self adherent waterproofing layers in roofing. The presence of gilsonite can result in substantial increases in the shear strength of these adhesives at the relatively high temperatures encountered in roofing applications. Also provided are waterproofing membranes comprising the inventive adhesive compositions.
Claims19
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, an ionomeric elastomer, and gilsonite.
A pressure sensitive adhesive composition comprising bitumen, about 1 to 50 parts by weight of ionomeric elastomer per 100 parts by weight of said bitumen, and about 10 to 130 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, and about 0.5 to 10 parts by weight of gilsonite per 100 parts by weight of said bitumen.
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, an ionomeric elastomer, and gilsonite.
Dependencies are inferred from the claim text.