Process for regenerating a monolithic, macro-structural, inter-penetrating elastomer network morphology from ground tire rubber particles

Patent metadata

Field	Value
Publication number	US-11286376-B2
Application number	US-202016900713-A
Country	US
Kind code	B2
Filing date	Jun 12, 2020
Priority date	Apr 25, 2017
Publication date	Mar 29, 2022
Grant date	Mar 29, 2022

Abstract

Crumb rubber obtained from recycled tires is subjected to an interlinked substitution process. The process utilizes a reactive component that interferes with sulfur bonds. The resulting treated rubber exhibits properties similar to those of the virgin composite rubber structure prior to being granulated, and is suitable for use in fabricating new tires, engineered rubber articles, and asphalt rubber for use in waterproofing and paving applications.

First claim

What is claimed is:

1. A rubber-based heterogeneous matrix comprising an interpenetrating network of two or more elastomers, the network comprising sulfur bridge cross linked, re-aligned, intermingled laminates having an average spacing of from 10 nm to 5 microns, wherein each laminate comprises one of the two or more elastomers.

2. The matrix of claim 1 , further comprising carbon black particles dispersed amongst the laminates.

3. The matrix of claim 1 , wherein the two or more elastomers comprise virgin natural rubber and an elastomer derived from ground tire rubber.

4. The matrix of claim 1 , wherein the two or more elastomers comprise virgin styrene butadiene/butadiene rubber and an elastomer derived from ground tire rubber.

5. The matrix of claim 1 , wherein two of the two or more elastomers have different backbone chemistries.

6. The matrix of claim 1 , wherein the two of the two or more elastomers having the different backbone chemistries are woven together and then cross linked separate from one another.

7. The matrix of claim 1 , in a form of a sheet.

8. The matrix of claim 7 , wherein the sheet exhibits an anisotropy in length tensile strength to width tensile strength, wherein the anisotropy in length tensile strength to width tensile strength is from 1.1:1 to 3:1.

9. A laminate comprising a plurality of sheets, wherein each of the sheets comprises a rubber-based heterogeneous matrix comprising an interpenetrating network of two or more elastomers, the network comprising sulfur bridge cross linked, re-aligned, intermingled laminates having an average spacing of from 10 nm to 5 microns, wherein each laminate comprises one of the two or more elastomers.

10. The laminate of claim 9 , wherein each of the sheets exhibits an anisotropy in length tensile strength to width tensile strength, wherein the anisotropy in length tensile strength to width tensile strength is from 1.1:1 to 3:1.

11. The laminate of claim 9 , wherein each of the sheets has a thickness of from 10 microns to 70 microns.

12. The laminate of claim 9 , wherein each of the sheets is vacuum heat fused and cross linked to an adjacent sheet.

13. The laminate of claim 9 , wherein each of the sheets is oriented 30 to 45 degrees to an anisotropic grain of an adjacent sheet.

14. An article selected from the group consisting of a rubber tire, an asphalt-rubber binder, an asphalt roofing material, an asphalt emulsion, a tire tread, a tire sidewall, a roofing membrane, a high dielectric electrical tape, a tank lining, a reservoir lining, a trench lining, a bridge underlayment, a wire harness wrap, a self-bonding wire harness wrap, a shoe sole, a rubber boot, an electrical tape, a foundation waterproofing, a parking garage waterproofing, a hose, a belt, and a molding, the article comprising a rubber-based heterogeneous matrix comprising an interpenetrating network of two or more elastomers, the network comprising sulfur bridge cross linked, re-aligned, intermingled laminates having an average spacing of from 10 nm to 5 microns, wherein each laminate comprises one of the two or more elastomers.

15. The article of claim 14 , which is a rubber tire, wherein from 3% by weight to 15% by weight of rubber in the tire is the rubber-based heterogeneous matrix.

16. The article of claim 14 , which is a rubber tire, wherein from 15% by weight to 100% by weight of the rubber in the tire is the rubber-based heterogeneous matrix.

17. The article of claim 14 , which is a tire tread comprising from 10% by weight to 50% by weight of the rubber-based heterogeneous matrix.

18. The article of claim 14 , which is a tire sidewall comprising from 5% by weight to 100% by weight of the rubber-based heterogeneous matrix.

19. The article of claim 14 , which is an asphalt-rubber binder comprising from 5% by weight to 95% by weight of the rubber-based heterogeneous matrix.

20. The article of claim 14 , which is an asphalt roofing material comprising from 5% by weight to 95% by weight of the rubber-based heterogeneous matrix.

Assignees

• Coe William B

Inventors

• Coe William B

Classifications

• C08J2409/06

  Copolymers with styrene · CPC title

• C08J2407/00

  Characterised by the use of natural rubber · CPC title

• C08J2319/00

  Characterised by the use of rubbers not provided for in groups C08J2307/00 - C08J2317/00 · CPC title

• C08J3/24 Primary

  Crosslinking, e.g. vulcanising, of macromolecules (mechanical aspects B29C35/00; crosslinking agents C08K) · CPC title

• C08J3/00 Primary

  Processes of treating or compounding macromolecular substances · CPC title