Stock material or miscellaneous articles – Structurally defined web or sheet – Including grain – strips – or filamentary elements in...
Patent
1981-06-12
1983-01-11
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including grain, strips, or filamentary elements in...
428141, 428247, 428283, 428284, 428285, 428291, 428340, 428402, 428489, 428913, B32B 512
Patent
active
043682286
ABSTRACT:
This invention relates to a novel bitumen mixture and a high performance prefabricated waterproofing membrane useful for roofing which is obtained by impregnating different layers of reinforcing material with the bitumen mixture. More particularly, the invention relates to a novel bitumen mixture and a waterproofing membrane comprising a series of reinforcing layers including a polyester mat, a mat of fiberglass and a fiberglass net. Each reinforcing layer is impregnated with bitumen mixed with a thermoplastic polymer wherein the polymer is selected from the group consisting of an amorphous copolymer of ethylene/propylene, atactic polypropylene, polyisobutylene and styrene-butadiene-styrene block copolymer. The mixture has a ring and ball softening point of at least 105.degree. C. and preferably about 155.degree. C.
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patent: 3336179 (1967-08-01), Campbell et al.
patent: 3741856 (1973-06-01), Hurst
patent: 3753938 (1973-08-01), Edwards
patent: 3917895 (1975-11-01), Bosniack
patent: 3937640 (1976-02-01), Tajisna et al.
Preliminary Performance Criteria for Bituminous Membrane Roofing, N.B.S. Series 55 (1974).
The Modified Bitumen One-Layers in Italy and Europe: Origins and Growth, Romolo Gorgati.
Bell James J.
Derbigum America Corporation
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