Stable paving compositions having improved low and high temperature properties
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United States of America Patent
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Mar 19, 2002
Grant Date -
N/A
app pub date -
Jul 17, 2000
filing date -
Jul 16, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A paving composition comprises a mixture of about 90 to 99.5 wt. % of an asphaltic material and about 0.5 to 10 wt. % of solid particles each encapsulated with a cross-linked polymer, the encapsulated particles being uniformly dispersed in the asphaltic material. The encapsulated particles have a particle-to-polymer weight ratio so as to provide a density match between the encapsulated particles and the asphaltic material. The paving composition according to the invention has a higher complex viscosity at high temperatures (60.degree. C.) and is more ductile at low temperatures (-15.degree. C.) in comparison with the base asphaltic material. Moreover, the composition is completely stable at elevated temperatures (160.degree. C.) or during long periods of storage.
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