C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 9/08 (2006.01) C04B 20/10 (2006.01) C04B 26/26 (2006.01) C08L 71/02 (2006.01) C08L 95/00 (2006.01) E01C 7/26 (2006.01) E01C 19/10 (2006.01)
Patent
CA 2301928
The antistrip characteristics of aggregate in asphalt concrete can be improved by coating the aggregate with certain latices. By doing so, the aggregate is provided with a higher level of resistance to stripping by water. For instance, aggregate can be coated with latex by: (1) mixing the aggregate with latex to form a latex/aggregate mixture; (2) heating the latex/aggregate mixture to a temperature which is within the range of about 66°C to about 232°C; and (3) maintaining the latex/aggregate mixture at said elevated temperature for a time which is sufficient to reduce the moisture content of the latex/aggregate mixture below about 0.7 weight percent and to allow the polymer in the latex to crosslink on the surface of the aggregate. However, the latices used in coating aggregate to improve antistrip characteristics typically have poor stability after being diluted with hard water. Such latices also have a tendency to cream during transportation and storage. This invention relates to latices having excellent characteristics for coating aggregate which have excellent stability when diluted with hard water and which exhibit a high level of resistance to creaming during transportation and storage. These latices are made by adding 0.1 phr to about 5 phr of a sulfonate surfactant and about 0.1 phr to about 4 phr of a ethylene oxide/propylene oxide triblock polymer to conventional styrene-butadiene rubber latices made with fatty acid soaps.
Smart & Biggar
The Goodyear Tire & Rubber Company
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