Process for preparing rubber-modified asphalt compositions

Details Process for preparing rubber-modified asphalt compositions Process for preparing rubber-modified asphalt compositions

1996-06-12

1997-11-04

Marcantoni, Paul

Compositions: coating or plastic

Coating or plastic compositions

Bituminous material or tarry residue

106274, 404 75, 404 77, 521 41, 521 455, 525 545, C08L 9500

Patent

active

056834985

ABSTRACT:
A modified asphalt composition having improved low-temperature fracture properties is obtained by devulcanizing crumb rubber, preferably ground rubber tire. The devulcanization is effected without the use of harsh oxidizing treatments or the addition of potentially hazardous solvents, by fractional distillation of a mixture of the rubber and crude oil to a temperature at which substantially complete devulcanization occurs and harmful volatiles are driven off, around 300.degree. C. The resulting compositions are relatively inexpensive and simple to produce and, not having been oxidized, may be expected to show better long-term aging and fatigue performance compared to air-blown asphalts and the like. They are also preferable, on grounds of health and safety, to prior paving asphalts containing significant proportions of volatile organic aliphatic or aromatic hydrocarbons.

REFERENCES:
patent: 3700615 (1972-10-01), Scott
patent: 3891585 (1975-06-01), McDonald
patent: 4018730 (1977-04-01), McDonald
patent: 4068023 (1978-01-01), Nielson et al.
patent: 4069182 (1978-01-01), McDonald
patent: 4211676 (1980-07-01), Watabe et al.
patent: 5304576 (1994-04-01), Martinez
patent: B13891585 (1989-11-01), McDonald

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