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

Patent metadata

Field	Value
Publication number	US-12486386-B2
Application number	US-202318534510-A
Country	US
Kind code	B2
Filing date	Dec 8, 2023
Priority date	Apr 25, 2017
Publication date	Dec 2, 2025
Grant date	Dec 2, 2025

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 method for preparing a modified rubber, comprising:
introducing into a reactor a mixture comprising vulcanized rubber particles and an organometallic compound having an octahedral molecular geometry, wherein pressure is applied to the mixture in the reactor so as to induce delamination of a rubber matrix within the vulcanized rubber particles coordinated with disrupting sulfidic linkages via a sulfidic metathesis reaction, whereby a modified rubber is obtained.

2 . The method of claim 1 , wherein the organometallic compound comprises a metal ion selected from the group consisting of Co2+, Cu2+, Ni2+, Zn2+, and Mn2+, and wherein the organometallic compound comprises an organic anion as a ligand to the metal ion.

3 . The method of claim 1 , wherein the organometallic compound is employed at from 0.1 to 5.0 parts organometallic compound per hundred parts vulcanized rubber particles (by weight).

4 . The method of claim 1 , wherein disrupted sulfidic linkages are reestablished to form sulfur bridge cross linked, re-aligned, laminates.

5 . The method of claim 1 , wherein delamination is associated with a portion of rigid sulfidic bridges of the vulcanized rubber particles becoming unbound at an original methyl carbocation while remaining tethered at an original allylic carbocation.

6 . The method of claim 1 , wherein the reactor is an electromechanical reactor.

7 . The method of claim 6 , wherein the electromechanical reactor is equipped with a cooling jacket or cooling coils.

8 . The method of claim 1 , wherein the reactor is a parallel, continuous-flow, micro-synthesis reactor.

9 . The method of claim 1 , wherein the vulcanized rubber crumbs have a particle size greater than 200 mesh.

10 . A modified rubber, prepared by the method of claim 1 .

11 . The modified rubber of claim 10 , having an unbound, reptated internal morphology.

12 . The modified rubber of claim 10 , wherein a portion of the rigid sulfidic linkages therein are each tethered at an original allylic carbocation and unbound at an original methyl carbocation, and wherein a portion of polymer backbones within the vulcanized rubber are substituted by an organic moiety.

13 . A rubber tire, comprising the modified rubber of claim 10 .

14 . The rubber tire of claim 13 , wherein the modified rubber comprises from 15% by weight to 100% by weight of the tire.

15 . A tire tread, tire sidewall, roofing membrane, high dielectric electrical tape, tank lining, reservoir lining, trench lining, bridge underlayment, wire harness wrap, self-bonding wire harness wrap, shoe soles, rubber boots, electrical tape, foundation waterproofing, parking garage waterproofing, hose, belt, or molding comprising the modified rubber of claim 10 .

16 . A tire tread comprising from 10% by weight to 50% by weight of modified rubber of claim 10 .

17 . A tire sidewall comprising from 5% by weight to 100% by weight of the modified rubber of claim 10 .

18 . An asphalt-rubber binder comprising from 5% by weight to 95% by weight of the modified rubber of claim 10 .

19 . An asphalt emulsion comprising from 5% by weight to 95% by weight of the modified rubber of claim 10 .

20 . An asphalt roofing material comprising from 5% by weight to 95% by weight of the modified rubber of claim 10 .

Assignees

• Coe William B

Inventors

• Coe William B

Classifications

• C08L2312/00

  Crosslinking · CPC title

• C08L2207/24

  recycling of old tyres and caoutchouc and addition of caoutchouc particles · CPC title

• C08L2207/02

  Heterophasic composition · CPC title

• C08L2203/16

  used for films · CPC title

• C08L2203/12

  used for fibers · CPC title