Tyre repair sealing composition

Abstract

A tyre repair sealing composition having: 30 to 80% natural latex, 5 to 35% synthetic latex, and 10 to 60% ethylene glycol, and wherein the diameter of the synthetic latex particles advantageously has a mean particle-size distribution of 0.04 to 0.5 μm.

1 . A tyre repair sealing composition comprising:
 30 to 80% natural latex   5 to 35% synthetic latex   to 60% ethylene glycol.   
     
     
         2 . A sealing composition as claimed in  claim 1 , characterized in that the diameter of the particles of said synthetic latex has a mean particle-size distribution of 0.04 to 0.5 μm. 
     
     
         3 . A sealing composition as claimed in  claim 2 , characterized in that the diameter of the particles of said synthetic latex has a mean particle-size distribution of 0.05 to 0.25 μm. 
     
     
         4 . A sealing composition as claimed in  claim 2 , characterized in that said diameter of the particles of said synthetic latex has a mean particle-size distribution of 0.1 μm. 
     
     
         5 . A sealing composition as claimed in  claim 1 , characterized by comprising 40 to 70% of said natural latex. 
     
     
         6 . A sealing composition as claimed in  claim 1 , characterized by comprising 10 to 20% of said synthetic latex. 
     
     
         7 . A sealing composition as claimed in  claim 1 , characterized by comprising 20 to 50% of said ethylene glycol. 
     
     
         8 . A sealing composition as claimed in  claim 1 , characterized by comprising:
 50-52% natural latex   14-16% synthetic latex   31-33% ethylene glycol.   
     
     
         9 . A sealing composition as claimed in  claim 1 , characterized in that said natural latex is a deproteinized natural latex. 
     
     
         10 . A sealing composition as claimed in  claim 1 , characterized in that said synthetic latex is selected from the group comprising styrene-butadiene and carboxylated styrene-butadiene latex. 
     
     
         11 . A sealing composition as claimed in  claim 1 , characterized by comprising a polyurethane latex. 
     
     
         12 . A sealing composition as claimed in  claim 5 , characterized by comprising 0.5% to 10% polyurethane latex. 
     
     
         13 . A sealing composition as claimed in  claim 5 , characterized by comprising 1% to 4% polyurethane latex. 
     
     
         14 . A sealing composition as claimed in  claim 1 , characterized by comprising an antioxidant and a stabilizing agent. 
     
     
         15 . A sealing composition as claimed in  claim 8 , characterized by comprising 0.1-1.5% of said antioxidant, and 0.5-2% of said stabilizing agent. 
     
     
         16 . A sealing composition as claimed in  claim 1 , characterized in that said synthetic latex has a gelation rate, measured by Mallon mechanical stability testing based on JIS-K6387, of at least 25%. 
     
     
         17 . A sealing composition as claimed in  claim 10 , characterized in that said synthetic latex has a gelation rate, measured by Mallon mechanical stability testing based on JIS-K6387, of over 50%.