Unblown ethylene-vinyl acetate copolymer treated asphalt and its

Details Unblown ethylene-vinyl acetate copolymer treated asphalt and its Unblown ethylene-vinyl acetate copolymer treated asphalt and its

1999-06-15

2000-10-24

Szekely, Peter A.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524 59, C08L 9500

Patent

active

061368989

ABSTRACT:
A method is provided for improving high temperature performance grade properties of unblown asphalt by i) heating an asphalt cement to 200.degree. F. to 500.degree. F. (93.degree. C. to 260.degree. C.), ii) adding 0.1 wt. % to 10 wt. % ethylene-vinyl acetate copolymer based on weight of said asphalt cement to the heated asphalt cement, iii) adding 0.05 wt. % to 1.0 wt. % phosphorus-containing acid, e.g., polyphosphoric acid, based on weight of said asphalt cement and iv) mixing the resulting blend, thereby providing an unblown asphalt composition of greater useful temperature index (UTI). The invention further relates to asphalt compositions thus made and paving compositions containing these asphalt compositions.

REFERENCES:
patent: 4454269 (1984-06-01), Goodrich
patent: 5070123 (1991-12-01), Moran
patent: 5095055 (1992-03-01), Moran
patent: 5990206 (1999-11-01), Tanaka et al.

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