Abstract: Rubber modified asphalts and their methods of manufacture. One or more sulfonic acids is/are added to a mixture of asphalt and rubber particles, or to an existing rubber modified asphalt composition. Heat and/or mixing may be applied during or after addition of the sulfonic acid(s).

Abstract: Non thixotropic, aqueous emulsions prepared from rubber modified asphalt cement (RMAC). The RMAC is prepared by a method whereby recycled tire rubber is liquified or otherwise consumed by or incorporated into asphalt such that no more than 2% by weight of solid particulate rubber remains. The RMAC may be emulsified in an aqueous or partially aqueous emulsification solution using a one-step or multi-step emulsification process. These aqueous RMAC emulsions are useable in many applications including paving, seal coat, roofing and slurry seal applications.

Abstract: Cationic aqueous emulsions of rubber modified asphalt cement (RMAC) useable for paving, seal coat, slurry seal, roofing, coating and other applications. First, a RMAC is prepared by combining 45 to 90% by weight asphalt with about 5% to about 55% by weight solid recycled rubber (e.g., crumb rubber from used vehicle tires) under conditions that cause at least a substantial portion of the solid rubber to become liquified or otherwise incorporated into the asphalt. The RMAC may be treated with dodecyl benzenesulfonic acid (DDBSA) which causes reaction(s) to occur and results in a lowering of the viscosity of the RMAC. The RMAC (or DDBSA-treated RMAC) may then be emulsified in an aqueous medium to provide an aqueous emulsion.

Abstract: The present invention discloses methods of making improved rubber modified asphalt cement compositions, and compositions made by the method, where the compositions are useful in paving, roofing, coating and other sealing applications. In one aspect, the method comprises combining asphalt, RVPR (or a blended mixture of asphalt and RVPR) and at least one dodecyl or tridecylbenzene sulfonic acid (SA), which can be linear (LAS) or branched (BAS), in the presence of moderate heat. After heating the resultant RMAC mixture exhibits at least one of the following: (1) an increase in softening point, (2) an increase in hardness, or (3) improved recovery from deformation. In another aspect, the invention teaches addition of at least one SA to previously manufactured RMAC to accomplish at least one of the following: (1) an increase in softening point, (2) an increase in hardness, or (3) improved recovery from deformation.

Abstract: Non thixotropic, aqueous emulsions prepared from rubber modified asphalt cement (RMAC). The RMAC is prepared by a method whereby recycled tire rubber is liquified or otherwise consumed by or incorporated into asphalt such that no more than 2% by weight of solid particulate rubber remains. The RMAC may be emulsified in an aqueous or partially aqueous emulsification solution using a one-step or multi-step emulsification process. These aqueous RMAC emulsions are useable in many applications including paving, seal coat, roofing and slurry seal applications.