Patent GB-638507-A (GB)
Title: Improvements in or relating to bituminous compositions
IPC: C08L95/00
Filed: 1947-01-22
Abstract: A composition suitable for surfacing asphalt roads, floors and aerodrome runways, to make them resistant to petroleum and other liquid hydrocarbons (see Group X), comprises an asphaltic material intimately incorporated with from 5 to 50 per cent by weight of the composition of a copolymer of a polyolefinic hydrocarbon with an unsaturated nitrile.  The copolymer has a nitrile content at least equivalent to that obtained by polymerizing a mixture of 20 per cent by weight of acrylonitrile and 80 per cent of butadiene.  Specified asphaltic materials are petroleum residues, pitches, road oils, albino asphalts, asphalt cutbacks, solutions or dispersions, cracked, straight-run or natural asphalts (see Group V).  The preferred polyolefines are conjugated dienes and trienes and their halogenated derivatives.  Acrylo-and methacrylo-nitriles and their alkyl, aryl and halo-substituted derivatives and crotonitrile are the preferred nitriles. Tripolymers may be used; listed are tripolymers of 3 - methyl - pentadiene - 1.3, butadiene - 1.3 and methacrylonitrile and of acrylonitrile, methacrylonitrile and 2-chloro-butadiene-1.3. Preferably, the composition is prepared by mixing aqueous dispersions of asphalt and copolymer, if desired in presence of soaps, caseinates, alginates, alkali metal, alkaline earth metal or ammonium hydroxides, phenyl-beta-naphthylamine, plasticizers, accelerators, fillers, waxes, curing agents and cation-active materials.  The compositions may be prepared by melting the ingredients together or used with solvents, e.g. ketones, aromatic and brominated or chlorinated aliphatic hydrocarbons, or mixed with solids, e.g. polybutadiene, copolymers of butadiene and isoprene, rubber, rubber waste, sand, clay, bentonite, sulphur and carbon black.ALSO:A composition suitable for surfacing asphalt roads, floors and aerodrome runways, to make them resistant to petroleum and other liquid hydrocarbons (see Group X) comprises an asphaltic material intimately incorporated with from 5 to 50 per cent by weight of the composition of a copolymer of a polyolefinic hydrocarbon with an unsaturated nitrile.  The copolymer has a nitrile content at least equivalent to that obtained by polymerizing a mixture of 20 per cent by weight of acrylonitrile and 80 per cent of butadiene (see Group IV (a)).  Specified asphaltic materials are petroleum residues, pitches, road oils, albino asphalts, asphalt cut-backs, solutions or dispersions, cracked, straight-run or natural asphalts.  The preferred polyolefines are conjugated dienes and trienes and their halogenated derivatives.  Acrylo-and methacrylo-nitriles and their alkyl, aryl and halo-substituted derivatives and crotonitrile are the preferred nitriles. Tripolymers may be used; listed are tripolymers of 3 methyl-pentadiene-1.3, butadiene- 1.3 and methacrylonitrile and of acrylonitrile, methacrylonitrile and 2 chlorobutadiene-1.3. Preferably the composition is prepared by mixing aqueous dispersions of asphalt and copolymer, if desired, in presence of soaps, caseinates, alginates, alkali, metal, alkaline earth metal or ammonium hydroxides, phenyl-beta-naphthylamine, plasticisers, accelerators, fillers, waxes, curing agents and cation-active materials.  The composition may be prepared by melting the ingredients together or be used with solvents, e.g. ketones, aromatic and halogenated aliphatic hydrocarbons, or mixed with solids, e.g. polybutadiene, copolymers of butadiene and isoprene, crepe, fresh and aged compounded rubber, rubber waste, sand, clay, bentonite, sulphur and carbon black.