High performing low viscosity tire sealant

Patent metadata

Field	Value
Publication number	US-11407883-B2
Application number	US-202117159828-A
Country	US
Kind code	B2
Filing date	Jan 27, 2021
Priority date	Feb 3, 2020
Publication date	Aug 9, 2022
Grant date	Aug 9, 2022

Abstract

A high performing low viscosity tire sealant includes about 15% to about 75% by weight of a biobased aliphatic diol, about 5% to about 50% by weight natural rubber latex, and about 2% to about 50% by weight synthetic rubber latex. The tire sealant exhibits excellent performance at temperatures of −40 degrees Celsius and lower.

First claim

We claim:

1. A puncture sealing composition, comprising:
about 15% to about 75% by weight of a biobased aliphatic diol;
about 10% to 40% by weight of a biodegradable highly filtered natural rubber latex that has a mechanical stability in excess of about 1050 seconds and an average particle size of about 400 microns or less; and
about 2% to about 10% by weight synthetic rubber latex;
wherein the biobased aliphatic diol constitutes at least about 95% by weight of a total amount of an antifreeze composition in the puncture sealing composition and the puncture sealing composition has a viscosity of less than 2000 centipoise at a temperature of about −40° C.

2. The puncture sealing composition of claim 1 , comprising about 2% to about 25% by weight added water.

3. The puncture sealing composition of claim 1 , further comprising about 2% to about 15% by weight of a tackifier.

4. The puncture sealing composition of claim 1 , about 0.1% to about 5% by weight of a surfactant.

5. The puncture sealing composition of claim 1 , further comprising about 0.1% to about 5% by weight of a filler and/or fibers.

6. The puncture sealing composition of claim 1 , wherein the biobased aliphatic diol is selected from the group consisting of biobased propane-1,3 diols and combinations thereof.

7. The puncture sealing composition of claim 1 , wherein the biobased aliphatic diol is present at about 25% to about 65% by weight.

8. The puncture sealing composition of claim 1 , wherein the biobased aliphatic diol is present at about 35% to about 45%.

9. The puncture sealing composition of claim 1 , wherein the antifreeze agent further comprises glycerin.

10. The puncture sealing composition of claim 1 , wherein the biodegradable highly filtered natural rubber latex is substantially free of coagulants.

11. The puncture sealing composition of claim 1 , wherein the biodegradable highly filtered natural rubber latex is present at about 20% to about 30% by weight.

12. The puncture sealing composition of claim 1 , wherein the synthetic rubber latex is selected from the group consisting of styrene-butadiene rubbers, acrylonitrile-butadiene rubbers, ethylene vinyl acetates, chloroprene rubbers, vinyl pyridine rubbers, butadiene rubbers, and combinations thereof.

13. The puncture sealing composition of claim 1 , wherein the synthetic rubber latex is present at about 4% to about 10% by weight.

14. The puncture sealing composition of claim 2 , wherein the added water is present at about 5% to about 20% by weight.

15. The puncture sealing composition of claim 3 , wherein the tackifier is selected from the group consisting of terpene resins, phenolic resins, polyvinyl esters, polyvinyl alcohol, polyvinyl pyrrolidone, and combinations thereof.

16. The puncture sealing composition of claim 3 , wherein the tackifier is present at about 3% to about 10% by weight.

17. The puncture sealing composition of claim 4 , wherein the surfactant comprises a nonionic emulsifier.

18. The puncture sealing composition of claim 5 , wherein the filler is selected from the group consisting of calcium carbonate, barium carbonate, silicon dioxide, titanium dioxide, calcium sulfate, barium sulfate, aluminum oxide, and combinations thereof.

19. A puncture sealing composition, comprising:
about 15% to about 75% by weight of a biobased aliphatic diol;
about 10% to 40% by weight of a biodegradable highly filtered natural rubber latex that has a mechanical stability in excess of about 1050 seconds and an average particle size of about 400 microns or less; and
about 2% to about 10% by weight synthetic rubber latex;
wherein the biobased aliphatic diol constitutes at least about 95% by weight of a total amount of an antifreeze composition in the puncture sealing composition and the puncture sealing composition has a freezing temperature of about −40 degrees Celsius or lower and has a viscosity of less than 2000 centipoise at a temperature of about −40° C.

20. The puncture sealing composition of claim 19 , wherein the freezing temperature is about −45 degrees Celsius or lower.

21. The puncture sealing composition of claim 19 , wherein the puncture sealing composition has a viscosity of about 60 centipoise or less at 25 degrees Celsius.

22. The puncture sealing composition of claim 21 , wherein the viscosity is about 55 centipoise or less at 25 degrees Celsius.

23. A method of making a puncture sealing composition, comprising the steps of adding and mixing the following ingredients together in a reactor, followed by sufficient stirring:
about 15% to about 75% by weight of a biobased aliphatic diol;
about 10% to 40% by weight of a biodegradable highly filtered natural rubber latex that has a mechanical stability in excess of about 1050 seconds and an average particle size of about 400 microns or less; and
about 2% to about 10% by weight synthetic rubber latex;
wherein the biobased aliphatic diol constitutes at least about 95% by weight of a total amount of an antifreeze composition in the puncture sealing composition and the puncture sealing composition has a viscosity of less than 2000 centipoise at a temperature of about −40° C.

Assignees

• Illinois Tool Works

Inventors

• Kundu Nihar Ranjan
• Kokkot Ranjith
• Jones Ryan
• Spindler Martin
• Deshpande Suboth Srinivas

Classifications

• C08L7/02 Primary

  Latex · CPC title

• C08L11/02

  Latex · CPC title

• B29D30/0685

  Incorporating auto-repairing or self-sealing arrangements or agents on or into tyres (auto-repairing or self-sealing arrangements or agents B29C73/16; puncture preventing arrangements B60C19/12) · CPC title

• B29C73/163 Primary

  Sealing compositions or agents, e.g. combined with propellant agents · CPC title

• C08L21/02

  Latex · CPC title