Bituminous compositions prepared with process treated vulcanized

Details Bituminous compositions prepared with process treated vulcanized Bituminous compositions prepared with process treated vulcanized

1997-11-20

1999-09-28

Krass, Frederick

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524 70, 524 71, 521 41, 521 445, 521 455, C08K 501, C08L 9108

Patent

active

059590076

ABSTRACT:
Stable rubberized bitumen concentrates are prepared by initially forming a mass comprising bitumen and crumb rubber particles in an amount of at least about 15 wt % of the mass with the crumb rubber being swollen in-situ, and applying shear and temperature conditions to the mass to dissociate the vulcanizate network of the rubber particles and to incorporate the digested vulcanizate into the bitumen. The stable rubberized bitumen concentrate is stable against sedimentation of rubber particles both following storage of the concentrate at about 320.degree. F. for 48 hours and dilution to a lower concentration in the ASTM solubility test.

REFERENCES:
patent: 5719215 (1998-02-01), Liang et al.

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