Crosslinkable polymer-modified asphalt and its method of prepara

Details Crosslinkable polymer-modified asphalt and its method of prepara Crosslinkable polymer-modified asphalt and its method of prepara

1999-06-15

2000-05-02

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, 524 69, 524 70, 524 71, C08L 9500

Patent

active

060573902

ABSTRACT:
A method is provided for improving high temperature performance grade properties of asphalt which comprises i) heating an asphalt cement to 200 to 500.degree. F. (93 to 260.degree. C.), ii) adding 1 to 10 wt. % crosslinkable polymer, e.g., styrene-butadiene-styrene triblock copolymer based on weight of said asphalt cement, iii) adding a useful temperature index (UTI) improving amount of dioxime(s) of 1,4-benzoquinone and its derivatives and optionally, free radical initiator, e.g., organic peroxide, and iv) mixing the resulting blend, thereby providing a paving asphalt having a greater useful temperature index (UTI) than a corresponding blend to which no dioxime is added. The invention further relates to asphalt compositions thus made and paving compositions containing these asphalt compositions.

REFERENCES:
patent: 4145322 (1979-03-01), Maldonado et al.
patent: 4332704 (1982-06-01), Marzocchi et al.

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