Novel Asphalt Binder Additive Compositions and Methods of Use

Abstract

The present application discloses compositions and methods for improving or enhancing the paving or re-paving of asphalt to road surfaces comprising the addition of the composition to the asphalt.

1 . An asphalt binder additive composition comprising:
 (a) a carrier matrix; and   (b) an agent selected from the group consisting of a curing agent and a masked curing agent.   
     
     
         2 . The composition of  claim 1  wherein the agent is a curing agent. 
     
     
         3 . The composition of  claim 1  wherein the agent is a masked curing agent. 
     
     
         4 . The composition of  claim 1  wherein the agent comprises both a curing agent and a masked curing agent. 
     
     
         5 . The composition of  claim 4 , wherein the composition comprises up to 5 wt pct curing agent, and up to 5 wt pct masked curing agent. 
     
     
         6 . The composition of  claim 1  wherein the carrier matrix is selected from the group consisting of an oil, a solid, and an emulsion. 
     
     
         7 . The composition of  claim 6  wherein the carrier matrix is an oil is selected from the group consisting of paraffinic oils or waxes, hydrolene, canola oil, coconut oil, linseed oil, safflower oil, soybean oil, tall oil, or tung oil, mineral oils, silicone oils, and mixtures thereof. 
     
     
         8 . The composition of  claim 6  wherein the carrier matrix is a solid selected from the group consisting of silicaceous material, lignin and rubber. 
     
     
         9 . The composition of  claim 1  wherein the curing agent comprises a compound of formula 
       
         
           
           
               
               
           
         
       
       wherein
 each R 1  and R 2  is independently selected from the group consisting of hydrogen or (C 1 -C 18 ) linear or branched alkyl or alkenyl, wherein each (C 1 -C 18 ) linear or branched alkyl or alkenyl is unsubstituted or substituted with one or more substituents selected from the group consisting of halo, nitro, trifluoromethyl, trifluoromethoxy, methoxy, carboxy, —NH 2 , —OH, —SH, —NHCH 3 , —N(CH 3 ) 2 , —SCH 3 , —CN, aryl and heteroaryl, further wherein at least one of R 1  and R 2  is not hydrogen, and at least one of R 1  and R 2  is (C 1 -C 12 ) linear or branched alkyl or alkenyl substituted with —OH, —SH, —COOH or —NH 2 , or 
 R 1 —C—R 2  together form a ring structure selected from (C 3 -C 10 )cycloalkyl, aryl and heteroaryl, unsubstituted or substituted with one or more substituents selected from the group consisting of halo, nitro, trifluoromethyl, trifluoromethoxy, methoxy, carboxy, —NH 2 , —OH, —SH, —NHCH 3 , —N(CH 3 ) 2 , —SCH 3 , —CN, (C 1 -C 6 )alkyl, and substituted (C 1 -C 6 )alkyl, and 
 Z 1  is selected from the group consisting of —COOH, —SO 3 H, —SO 2 H, —OSO 3 H, —PO 3 H 2 , —OPO 3 H 2 , and —OSi(R′)(R″)OH, wherein R′ and R″ are independently H or (C 1 -C 12 ) linear or branched alkyl or alkoxy. 
 
     
     
         10 . The composition of  claim 9  wherein the curing agent is selected from the group consisting of ascorbic acid, benzoic acid, phthalic acid, cinnamic acid, citric acid, 2-pyridine carboxylic acid, salicylic acid and stearic acid. 
     
     
         11 . The composition of  claim 1  wherein the masked curing agent comprises 
       
         
           
           
               
               
           
         
       
       wherein
 each R 3  and R 4  is independently selected from the group consisting of hydrogen or (C 1 -C 18 ) linear or branched alkyl or alkenyl, wherein each (C 1 -C 18 ) linear or branched alkyl is unsubstituted or substituted with 1 or more substituents selected from the group consisting of halo, nitro, trifluoromethyl, trifluoromethoxy, methoxy, carboxy, —NH 2 , —OH, —SH, —NHCH 3 , —N(CH 3 ) 2 , —SCH 3 , —CN, aryl and heteroaryl, further wherein at least one of R 3  and R 4  is not hydrogen, and at least one of R 3  and R 4  is (C 1 -C 12 ) linear or branched alkyl or alkenyl substituted with —OH, —SH, —COOH or —NH 2 , or 
 R 3 —C—R 4  together form a ring structure selected from (C 3 -C 10 )cycloalkyl, aryl and heteroaryl, unsubstituted or substituted with 1 or more substituents selected from the group consisting of halo, nitro, trifluoromethyl, trifluoromethoxy, methoxy, carboxy, —NH 2 , —OH, —SH, —NHCH 3 , —N(CH 3 ) 2 , —SCH 3 , —CN, (C 1 -C 6 )alkyl, and substituted (C 1 -C 6 )alkyl, and 
 Z 2  is selected from the group consisting of —COOR, —SO 3 R, —SO 2 R—OSO 3 R, —PO 3 HR, —OPO 3 HR, and —OSi(R′)(R″)OR where R′ and R″ are independently H or (C 1 -C 12 ) linear or branched alkyl or alkoxy, and further wherein R is (C 1 -C 12 ) linear or branched alkyl. 
 
     
     
         12 . The composition of  claim 11  wherein the masked curing agent is selected from the group consisting of methyl-, ethyl-, isopropyl- and hexyl salicylate. 
     
     
         13 . A method for improving or enhancing the paving or re-paving of asphalt mixture to road surfaces comprising combining the composition of  claim 1  with an asphalt binder. 
     
     
         14 . The method of  claim 13 , wherein the combining step comprises adding the composition of  claim 1  directly to an asphalt mixture. 
     
     
         15 . The method of  claim 13  wherein the composition of  claim 1  is added directly to a virgin asphalt mixture. 
     
     
         16 . The method of  claim 14 , wherein the composition is added directly to recycled asphalt pavement (RAP). 
     
     
         17 . The method of  claim 14  wherein the addition is performed at a “warm mix” temperature. 
     
     
         18 . An asphalt binder composition comprising:
 (a) an asphalt binder; and   (b) the asphalt additive composition of  claim 1 .   
     
     
         19 . An asphalt mixture composition comprising:
 (a) a recycled material selected from the group consisting of reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS); and   (b) the asphalt additive composition of  claim 1 .   
     
     
         20 . (canceled) 
     
     
         21 . (canceled) 
     
     
         22 . (canceled)