Polymer-containing bituminous composition and composite sealing sheet including the same
OwnerHenri F. M. Desgouillesinventor
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Abstract
This invention relates to a bitumen-based composition comprising a ternary mixture of (a) 52-78 wt % bitumen, (b) 20-40 wt % polyolefin and (c) 2-8 wt % of a butadiene-styrene copolymer. Said composition is useful alone for sealing purposes as a melt or a solution, and is also useful for the production of composite sealing sheets.
Claims14
Bitumen-, polyolefin- and elastomer-based sealant composition consisting essentially of a mixture of (a) 52-78 wt. % of bitumen, (b) 20-40 wt. % of a polyolefin selected from a polypropylene, a polybutylene, an ethylene-propylene copolymer and a propylene-ethylene-butylene copolymer and having a viscosity in the order of 10,000 to 30,000 centipoises at 190.degree. C. and a TBA softening point between about 100.degree. C. and about 180.degree. C., and (c) 2-8 wt. % of a styrene-butadiene copolymer elastomer having a molecular weight of about 100,000 to about 300,000, said composition having a TBA softening point of at least 140.degree. C., a tensile elongation at break of about 800% to about 2000%, and a flexibility in the cold such that cracks do not form at temperatures as low as -40.degree. C.
Composite sealing sheet, consisting essentially of at least a reinforcing support carrying a composition comprising a mixture of (a) 52-78 wt. % bitumen, (b) 20-40 wt. % of polyolefin selected from a polypropylene, a polybutylene, an ethylene-propylene copolymer and a propylene-ethylene-butylene copolymer and having a viscosity in the order of 10,000 to 30,000 centipoises at 190.degree. C. and a TBA softening point between about 100.degree. C. and about 180.degree. C., and (c) 2-8 wt. % of a styrene-butadiene copolymer elastomer having a molecular weight of about 100,000 to about 300,000, said composition having a TBA softening point of at least 140.degree. C., a tensile elongation at break of about 800% to about 2000%, and a flexibility in the cold such that cracks do not form at temperatures as low as -40.degree. C.
Sealing sheet as claimed in claim 7, in the form of at least two sheets as defined in claim 10 adhesively secured together.
Dependencies are inferred from the claim text.