Liquid pavement marking compositions

Abstract

A pavement marking composition, methods of applying, and pavement markings produced therefrom. The composition is a two-part coating composition having an amine component including one or more aspartic ester amines and optionally one or more amine-functional coreactants, an isocyanate component including one or more polyisocyanates, and material selected from the group of fillers, extenders, pigments, and combinations thereof.

1. A pavement marking comprising:
 a binder having polyurea groups, wherein the binder is prepared from a coating composition comprising:, 
 one or more aliphatic secondary amines;  
 one or more polyisocyanates; and  
 material selected from the group of fillers, extenders, pigments, and combinations thereof; and  
 reflective elements;  
 wherein the pavement marking has a retained reflectivity of at least about 100 mcd/m 2 lux after at least about 2 years in use as longitudinal traffic markings as measured according to ASTM E 1710-95.  
 
 
     
     
       2. A pavement marking comprising:
 a binder having polyurea groups, wherein the binder is prepared from a coating composition comprising: 
 one or more aliphatic secondary amines comprising an aspartic ester amine;  
 one or more polyisocyanates; and  
 material selected from the group of fillers, extenders, pigments, and combinations thereof; and  
 retroreflective optical elements having vertical surfaces.  
 
 
     
     
       3. A pavement marking comprising:
 a binder having polyurea groups, wherein the binder is prepared from a coating composition comprising: 
 one or more aliphatic secondary amines;  
 one or more polyisocyanates; and  
 material selected from the group of fillers, extenders, pigments, and combinations thereof; and  
 
 reflective elements;  
 wherein the coating composition has a minimum application temperature of at least about 7° C. and a track-free time of no greater than about 5 minutes.  
 
     
     
       4. A pavement marking comprising:
 a binder having polyurea groups, wherein the binder is prepared from a coating composition comprising: 
 one or more aliphatic secondary amines;  
 one or more polyisocyanates; and  
 material selected from the group of fillers, extenders, pigments, and combinations thereof; and  
 
 reflective elements comprising ceramic microspheres.  
 
     
     
       5. A pavement marking comprising:
 a binder having polyurea groups, wherein the binder is prepared from a coating composition comprising: 
 one or more aliphatic secondary amines;  
 one or more polyisocyanates; and  
 material selected from the group of fillers, extenders, pigments, and combinations thereof; and  
 
 retroreflective optical elements having vertical surfaces;  
 wherein the coating composition is substantially free of volatile organic components.  
 
     
     
       6. A pavement marking comprising:
 a binder having polyurea groups, wherein the binder is prepared from a coating composition comprising: 
 one or more aliphatic secondary amines;  
 one or more polyisocyanates; and  
 material selected from the group of fillers, extenders, pigments, and combinations thereof; and  
 
 reflective elements;  
 wherein the coating composition has an open time of at least about 30 seconds.  
 
     
     
       7. A pavement marking comprising:
 a binder having polyurea groups, wherein the binder is prepared from a coating composition comprising: 
 one or more aliphatic secondary amines;  
 one or more polyisocyanates; and  
 material selected from the group of fillers, extenders, pigments, and combinations thereof, wherein the filler comprises hollow glass microspheres; and  
 
 reflective elements.  
 
     
     
       8. A pavement marking comprising:
 a binder having polyurea groups, wherein the binder is prepared from a coating composition comprising: 
 one or more aliphatic secondary amines;  
 one or more polyisocyanates; and  
 material selected from the group of fillers, extenders, pigments, and combinations thereof in an amount of at least about 15 weight percent, based on the weight of the final dried coating; and  
 
 reflective elements.  
 
     
     
       9. The pavement marking of  claim 8  comprising material selected from the group of fillers, extenders, pigments, and combinations thereof in an amount of about 30 weight percent to about 42 weight percent, based on the weight of the final dried coating. 
     
     
       10. A pavement marking comprising a binder having polyurea groups, wherein the binder is prepared from a sprayable, two-part coating composition substantially free of volatile organic components and comprising an amine component comprising one or more aspartic ester amines and an isocyanate component comprising one or more polyisocyanates; wherein:
 at least one of the amine component and the isocyanate component further comprises material selected from the group of fillers, extenders, pigments, and combinations thereof; and  
 the coating composition has a minimum application temperature of at least about 7° C. and a track-free time of no greater than about 5 minutes.  
 
     
     
       11. The pavement marking of  claim 10  which has a retained reflectivity of at least about 100 mcd/m 2 /lux after at least about 2 years in use as longitudinal traffic markings as measured according to ASTM E 1710-95. 
     
     
       12. A coating composition comprising:
 one or more aliphatic secondary amines;  
 one or more polyisocyanates; and  
 material selected from the group of fillers, extenders, pigments, and combinations thereof; and  
 wherein the coating composition has a minimum application temperature of at least about 7° C., a track-free time of no greater than about 5 minutes, and forms a pavement marking having reflective elements with a retained reflectivity of at least about 100 mcd/m 2 /lux after at least about 2 years in use as longitudinal traffic markings as measured according to ASTM E 1710-95.  
 
     
     
       13. The coating composition of  claim 12  wherein the one or more aliphatic secondary amines comprise a secondary amine-functional polymer. 
     
     
       14. The coating composition of  claim 12  wherein the one or more aliphatic secondary amines comprise an aspartic ester amine. 
     
     
       15. The coating composition of  claim 12  which has a minimum application temperature of at least about −4° C. 
     
     
       16. The coating composition of  claim 12  which is substantially free of volatile organic components. 
     
     
       17. The coating composition of  claim 12  which has an open time of at least about 30 seconds. 
     
     
       18. The coating composition of  claim 12  wherein the filler comprises hollow glass microspheres. 
     
     
       19. The coating composition of  claim 12  comprising material selected from the group of fillers, extenders, pigments, and combinations thereof in an amount of at least about 15 weight percent, based on the weight of the final dried coating. 
     
     
       20. The coating composition of  claim 19  comprising material selected from the group of fillers, extenders, pigments, and combinations thereof in an amount of about 30 weight percent to about 42 weight percent, based on the weight of the final dried coating. 
     
     
       21. A sprayable two-part liquid pavement marking composition comprising:
 an amine component comprising one or more aspartic ester amines and optionally one or more amine-functional coreactants; and  
 an isocyanate component comprising one or more poly-isocyanates; wherein 
 the amine component, the isocyanate component, or both further comprise material selected from the group of fillers, extenders, pigments, and combinations thereof;  
 the pavement marking composition is sprayable, and has a minimum application temperature of at least about 7° C. and a track-free time of no greater than about 5 minutes.  
 
 
     
     
       22. The two-part liquid pavement marking composition of  claim 21  wherein the amine-functional coreactant is an amine-functional polymer. 
     
     
       23. A sprayable two-part liquid pavement marking composition comprising:
 an amine component comprising one or more aspartic ester amines and optionally one or more amine-functional coreactants; and  
 an isocyanate component comprising one or more poly-isocyanates; wherein: 
 the amine component, the isocyanate component, or both further comprise reflective elements and material selected from the group of fillers, extenders, pigments, and combinations thereof,  
 the pavement marking composition is sprayable, and has a minimum application temperature of at least about 7° C. and a track-free time of no greater than about 5 minutes.  
 
 
     
     
       24. The two-part liquid pavement marking composition of  claim 23  wherein the reflective elements comprise ceramic microspheres. 
     
     
       25. A traffic bearing surface having thereon a pavement marking comprising:
 a binder having polyurea groups, wherein the binder is prepared from a coating composition comprising: 
 one or more aliphatic secondary amines;  
 one or more polyisocyanates; and  
 material selected from the group of fillers, extenders, pigments, and combinations thereof; and  
 
 retroreflective optical elements having vertical surfaces.  
 
     
     
       26. A traffic bearing surface having thereon the pavement marking of  claim 10 . 
     
     
       27. A pre-formed pavement marking comprising a substrate having coated thereon the pavement marking of  claim 10 . 
     
     
       28. A method of preparing a pavement marking, the method comprising:
 providing an amine component comprising one or more aliphatic secondary amines;  
 providing an isocyanate component comprising one or more polyisocyanates;  
 providing material selected from the group of fillers, extenders, pigments, and combinations thereof in either the amine component, the isocyanate component, or both;  
 combining the amine component and the isocyanate component to form a coating composition having a minimum application temperature of at least about 7° C., and a track-free time of no greater than about 5 minutes;  
 applying the coating composition to a surface; and  
 applying reflective elements to the composition coated on the surface to form a pavement marking having reflective elements with a retained reflectivity of at least about 100 mcd/m 2 /lux after at least about 2 years in use as longitudinal traffic markings as measured according to ASTM E 1710-95.  
 
     
     
       29. The method of  claim 28  wherein the surface is a traffic bearing surface. 
     
     
       30. The method of  claim 28  wherein the pavement marking further comprises reflective elements. 
     
     
       31. The method of  claim 30  wherein the reflective elements are applied to the composition coated on the traffic bearing surface. 
     
     
       32. The method of  claim 28  wherein the step of applying the coating composition comprises spraying the coating composition. 
     
     
       33. The method of  claim 28  wherein the amine and isocyanate components are combined in a volume ratio of about 2:1 amine to isocyanate. 
     
     
       34. The method of  claim 28  wherein the amine and isocyanate components are combined in a volume ratio of about 3:1 amine to isocyanate. 
     
     
       35. A method of marking a traffic bearing surface, the method comprising:
 providing an amine component comprising one or more aspartic ester amines and optionally one or more amine-functional coreactants;  
 providing to isocyanate component comprising one or more polyisocyanates;  
 providing material selected from the group of fillers, extenders, pigments, and combinations thereof in either the amine component, the isocyanate component, or both;  
 combining the amine component and the isocyanate component to form a coating composition having a minimum application temperature of at least about 7° C., and a track-free time of no greater than about 5 minutes;  
 spraying the coating composition onto a traffic bearing surface; and  
 applying reflective elements to the composition coated on the traffic bearing surface to form a pavement marking.  
 
     
     
       36. A sprayable two-part liquid pavement marking composition comprising:
 an amine component comprising one or more aspartic ester amines and optionally one or more amine-functional coreactants; and  
 an isocyanate component comprising one or more polyisocyanates; wherein: 
 the amine component, the isocyanate component, or both further comprise material selected from the group of fillers, extenders, pigments, and combinations thereof;  
 the pavement marking composition is sprayable, and has a minimum application temperature of at least about 7° C., an open time of at least about 30 seconds, and a track-free time of no greater than about 5 minutes.  
 
 
     
     
       37. A sprayable two-part liquid pavement marking composition comprising:
 an amine component comprising one or more aspartic ester amines and optionally one or more amine-functional coreactants; and  
 an isocyanate component comprising one or more polyisocyanates; wherein: 
 the amine component, the isocyanate component, or both further comprise material selected from the group of fillers, extenders, pigments, and combinations thereof;  
 the pavement marking composition is sprayable and forms a pavement marking having reflective elements, and has a minimum application temperature of at least about 7° C. and a track-free time of no greater than about 5 minutes.  
 
 
     
     
       38. A pavement marking comprising reflective elements and a binder having polyurea groups, wherein the binder is prepared from a sprayable, two-part coating composition substantially free of volatile organic components and comprising an amine component comprising one or more aspartic ester amines and an isocyanate component comprising one or more polyisocyanates; wherein:
 at least one of the amine component and the isocyanate component further comprises material selected from the group of fillers, extenders, pigments, and combinations thereof; and  
 
       the coating composition has a minimum application temperature of at least about 7° C. and a track-free time of no greater than about 5 minutes. 
     
     
       39. The pavement marking of  claim 1  wherein the pavement marking has a retained reflectivity of at least about  150  mcd/m 2   /lux.   
     
     
       40. The pavement marking of  claim 11  wherein the pavement marking has a retained reflectivity of at least about  150  mcd/m 2   /lux.   
     
     
       41. The coating composition of  claim 12  wherein the pavement marking has a retained reflectivity of at least about  150  mcd/m 2   /lux.   
     
     
       42. The method of  claim 28  wherein the pavement marking has a retained reflectivity of at least about  150  mcd/m 2   /lux.   
     
     
       43. The pavement marking of  claim 2  wherein the retroreflective optical elements comprise glass or ceramic microspheres partially embedded in the vertical surfaces of a reflective element core. 
     
     
       44. The pavement marking of  claim 43  wherein the retroreflective elements comprise an opacified ceramic core and ceramic optical elements partially embedded in the core. 
     
     
       45. The pavement marking of  claim 43  wherein the retroreflective elements comprise a polymeric core and optical elements embedded in the core surface. 
     
     
       46. The pavement marking of  claim 5  wherein the retroreflective optical elements comprise glass or ceramic microspheres partially embedded in the vertical surfaces of a reflective element core. 
     
     
       47. The pavement marking of  claim 46  wherein the retroreflective elements comprise an opacified ceramic core and ceramic optical elements partially embedded in the core. 
     
     
       48. The pavement marking of  claim 46  wherein the retroreflective elements comprise a polymeric core and optical elements embedded in the core surface. 
     
     
       49. The traffic bearing surface of  claim 25  wherein the retroreflective optical elements comprise glass or ceramic microspheres partially embedded in the vertical surfaces of a reflective element core. 
     
     
       50. The traffic bearing surface of  claim 49  wherein the retroreflective elements comprise an opacified ceramic core and ceramic optical elements partially embedded in the core. 
     
     
       51. The traffic bearing surface of  claim 49  wherein the retroreflective elements comprise a polymeric core and optical elements embedded in the core surface.