Abstract Improved rubberized coal tar emulsion compositions especially suitable for sealing bituminous pavement compositions, such as asphalt pavement compositions. A composition according to the invention comprises a major portion of a prepared coal tar pitch emulsion and water, having admixed therewith a small amount of an acrylonitrile/butadiene copolymer latex having an extraordinarily small particle size. Preferred compositions additionally include a silicone resin. The compositions further include an appropriate aggregate filler material such as sand. Compositions according to the invention are characterized by a thixotropic nature and the ability to maintain an aggregate in matrix like suspension. A film cast from such compositions applied as a sealing coat to an asphalt pavement is characterized by long life, uniform filler distribution, and excellent bonding characteristics.
IN RUBBERIZED COAL TAR EMULSION COATING COMPOSITIONS, THE IMPROVEMENT COMPRISING AN AQUEOUS COLAR TAR EMULSION HAVING ADMIXED THEREWITH 2.5 TO 15 PERCENT BY WEIGHT, OF AN ACRYLONITRILE/BUTADIENE COPOLYMER LATEX BASED UPON THE COPOLYMER CONTENT IN SAID LATEX AND TAR CONTENT IN SAID AQUEOUS COAL TAR EMULSION, SAID ACRYLONITRILE/BUTADIENE LATEX HAVING AN AVERAGE PARTICLE SIZE BETWEEN 400 AND 1000 A, AND SAID ACRYLONITRILE/BUTADIENE COPOLYMER CONTAINING 30-49 PARTS ACRYLONITRILE AND 70-51 PARTS BUTADIENE, WHEREBY SAID COMPOSITION IS CHARACTERIZED BY A THIXOTROPIC NATURE.
Claim 2
Dependent Claim
80 words
IN RUBBERIZED COAL TAR EMULSION COATING COMPOSITIONS, THE IMPROVEMENT COMPRISING AN AQUEOUS COLAR TAR EMULSION HAVING ADMIXED THEREWITH 2.5 TO 15 PERCENT BY WEIGHT, OF AN ACRYLONITRILE/BUTADIENE COPOLYMER LATEX BASED UPON THE COPOLYMER CONTENT IN SAID LATEX AND TAR CONTENT IN SAID AQUEOUS COAL TAR EMULSION, SAID ACRYLONITRILE/BUTADIENE LATEX HAVING AN AVERAGE PARTICLE SIZE BETWEEN 400 AND 1000 A, AND SAID ACRYLONITRILE/BUTADIENE COPOLYMER CONTAINING 30-49 PARTS ACRYLONITRILE AND 70-51 PARTS BUTADIENE, WHEREBY SAID COMPOSITION IS CHARACTERIZED BY A THIXOTROPIC NATURE.
Claim 3
Dependent Claim
31 words
The composition as set forth in claim 1 wherein said acrylonitrile/butadiene copolymer is present in an amount from 8 to 12% by weight based upon tar in said coal tar emulsion.