Aqueous rubberized coal tar emulsion

A thixotropic rubberized coal-tar-containing composition for coating asphalt pavements and the like consisting essentially of a mixture of a standard coal tar emulsion containing about 40 to about 60 percent water based on the volume of the coal tar emulsion and from about 1 to about 20 percent by volume of an acid copolymer latex emulsion based on the volume of the coal tar emulsion, wherein said copolymer contains at least 50 percent by weight of a combination of butadiene and styrene, and up to about 20 percent by weight of at least one polymerizable ethylenically unsaturated monomer containing at least one carboxylic acid group or mixtures thereof to form the said copolymer latex, said acid copolymer latex emulsion having an average latex particle size of from about 400 to about 2000 .ANG.ngstroms, all moieties of the acid copolymer based on the weight of the copolymer, and sand being present in the amount of between 0.5 and about 20 pounds per gallon of said standard coal tar emulsion, the ratio of water to coal tar emulsion being about 1 to about 1, whereby after mixing, a thixotropic composition is formed that retains sufficient thixotropicity to retard significant settling of the sand homogeneously mixed to form the rubberized coal-tar-containing composition.

An improved paved asphalt surface and the like, which is prepared by applying a thin coating of a thixotropic composition that consists essentially of a mixture of a standard coal tar emulsion containing about 40 to about 60 percent water based on the volume of the coal tar emulsion, from about 1 to about 12 percent by weight of a latex emulsion copolymer based on the volume of the coal tar emulsion, wherein said copolymer contains at least 50 percent by weight of a combination of butadiene and styrene, and up to about 20 percent by weight of at least one polymerizable ethylenically unsaturated monomer containing at least one carboxylic acid group or mixtures thereof to form the acid copolymer latex, said acid copolymer latex emulsion having an average latex particle size of from about 400 to about 2000 .ANG.ngstroms, all moieties of the copolymer based on the weight of the copolymer latex emulsion, and sand being present in the amount of between 0.5 to about 20 pounds per gallon of said conventional coal tar emulsion, the ratio of water to coal tar emulsion being about 1 to about 1, whereby said dried coating presents a hard durable surface on the surface of the paved asphalt.