High performance environmentally friendly sealant composition for tire repair

Patent metadata

Field	Value
Publication number	US-9963620-B2
Application number	US-201615057015-A
Country	US
Kind code	B2
Filing date	Feb 29, 2016
Priority date	Apr 1, 2015
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

An environmentally friendly puncture sealing composition is provided which includes natural rubber latex, suitably high filtered natural rubber latex having a controlled particle size, and an aqueous antifreeze agent that includes water, glycerin and propylene glycol. The aqueous antifreeze agent has a viscosity profile similar to common ethylene glycol-based antifreeze agents, but is free of ethylene glycol. The puncture sealing composition avoids the environmental hazards of ethylene glycol, and is effective at temperatures of −30° C. and lower.

First claim

We claim:

1. A puncture sealing composition, comprising:
about 25 to about 75% by weight natural rubber latex having a mechanical stability in excess of about 1050 seconds; and
about 25 to about 75% by weight of an aqueous antifreeze solution;
wherein the aqueous antifreeze solution comprises, by weight of the solution, 15-50% water, about 20-60% glycerin, and about 20-60% propylene glycol.

2. The puncture sealing composition of claim 1 , wherein the natural rubber latex is free of coagulants.

3. The puncture sealing composition of claim 2 , wherein the natural rubber latex is highly filtered.

4. The puncture sealing composition of claim 1 , wherein the natural rubber latex has an average particle size of about 400 microns or less.

5. The puncture sealing composition of claim 1 , wherein the natural rubber latex comprises natural rubber and ammonia.

6. The puncture sealing composition of claim 1 , wherein the puncture sealing composition comprises about 40 to about 60% by weight of the natural rubber latex and about 40 to about 60% by weight of the aqueous antifreeze solution.

7. The puncture sealing composition of claim 1 , wherein the aqueous antifreeze solution comprises, by weight of the solution, 15-35% water, about 30-45% glycerin, and about 30-45% propylene glycol.

8. A puncture sealing composition, comprising:
about 35 to about 65% by weight natural rubber latex having a mechanical stability in excess of about 1050 seconds; and
about 35 to about 65% by weight of an aqueous antifreeze solution;
wherein the aqueous antifreeze solution comprises, by weight of the solution, 15-35% water, about 30-45% glycerin, and about 30-45% propylene glycol.

9. The puncture sealing composition of claim 8 , wherein the natural rubber latex is free of coagulants.

10. The puncture sealing composition of claim 8 , wherein the natural rubber latex is highly filtered.

11. The puncture sealing composition of claim 8 , wherein the natural rubber latex has a particle size of about 400 microns or less.

12. The puncture sealing composition of claim 8 , wherein the natural rubber latex comprises about 55-65% by weight natural rubber, up to about 0.25% by weight ammonia, and a balance of water.

13. The puncture sealing composition of claim 8 , wherein the puncture sealing composition comprises about 45 to about 55% by weight of the natural rubber latex and about 45 to about 55% by weigh of the aqueous antifreeze solution.

14. The puncture sealing composition of claim 13 , wherein the natural rubber latex has an average particle size of about 400 microns or less.

15. A puncture sealing composition, comprising:
about 35 to about 65% by weight of a highly filtered natural rubber latex that is free of coagulants and having a mechanical stability in excess of about 1050 seconds; and
about 35 to about 65% by weight of an aqueous antifreeze solution;
wherein the natural rubber latex comprises by weight of the latex, about 55-65% natural rubber, less than about 0.25% ammonia, and a balance of water;
and the aqueous antifreeze solution comprises, by weight of the solution, 15-35% water, about 30-45% glycerin, and about 30-45% propylene glycol.

16. The puncture sealing composition of claim 15 , wherein the puncture sealing composition comprises about 45 to about 55% by weight of the natural rubber latex and about 45 to about 55% by weight of the aqueous antifreeze solution.

17. The puncture sealing composition of claim 15 , further comprising an inorganic powder.

18. The puncture sealing composition of claim 17 , wherein the inorganic powder has an average particle diameter of about 150 nanometers or less.

19. The puncture sealing composition of claim 17 , wherein the inorganic powder is selected from the group consisting of calcium carbonate, barium carbonate, silicon dioxide, titanium dioxide, calcium sulfate, barium sulfate, aluminum oxide, and combinations thereof.

20. The puncture sealing composition of claim 17 , comprising about 0.5-2.5% by weight of the inorganic powder.

Assignees

• Illinois Tool Works

Inventors

• Sulemanji Shees N
• Haener Brandt A
• Smith Bryan Douglas
• Spindler Martin Patrick
• Klemm Henry Friedrich Ferdinand
• Chetosky Gordon

Classifications

• C08K3/30

  Sulfur-, selenium- or tellurium-containing compounds · CPC title

• C08K3/36

  Silica · CPC title

• C08K5/053

  Polyhydroxylic alcohols · CPC title

• C08K3/22

  of metals · CPC title

• C08K2003/2227

  of aluminium · CPC title