Method of producing, using and composition of phenolic-type polymer modified asphalts or bitumens
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United States of America Patent
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Oct 26, 1993
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app pub date -
Jul 17, 1992
filing date -
Jul 17, 1992
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Abstract
A method of producing cross-linked polymer modified asphalt or bitumen. The method includes the steps of combining by agitation polymers chosen from a group consisting of styrene rubber, styrene butadiene rubber, polydiene rubber and polyolefin diene rubber, 80 to 99% by weight of asphalt or bitumen, with the asphalt or bitumen at temperatures of 130.degree. to 230.degree. C. to form a homogeneous mixture. Thereafter, 0.05 to 2.0% by weight of asphalt of a reactive phenol-aldehyde resin is added to the mixture. The reaction is thereafter completed by continuing agitation of the mixture.
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