Reinforcement of elastomers by reactive ionic surfactant

Patent metadata

Field	Value
Publication number	US-11827769-B2
Application number	US-202117174412-A
Country	US
Kind code	B2
Filing date	Feb 12, 2021
Priority date	Feb 13, 2020
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

Curable rubber compositions that include reactive ionic surfactants as reinforcing fillers are described, as well as methods for preparing composite rubber compounds by direct addition of ionic surfactant solutions into rubber latex.

First claim

What is claimed is:

1. A curable rubber composition comprising a reactive surfactant represented by the formula:
X—R—Y n− Z n+

where X is a reactive group that reacts with rubber to form a covalent bond, Y is an anionic group formally bearing “n” negative charges, Z is a cationic atom or group formally bearing n positive charges to balance the collective negative charges of Y, n is an integer of from 1 to 3, and R is an organic linking group.

2. The curable rubber composition of claim 1 , wherein X includes at least one functional group selected from sulfur-containing groups, unsaturated hydrocarbon groups, and aldehyde groups.

3. The curable rubber composition of claim 1 , wherein X is a thiol group (S—H), a thioaldehyde group, a thioketone group (C═S), or a sulfur group (S—S).

4. The curable rubber composition of claim 1 , wherein X is a thiol group (S—H).

5. The curable rubber composition of claim 1 , wherein X is a thioketone group (C═S).

6. The curable rubber composition of claim 1 , wherein X includes an S—S group.

7. The curable rubber composition of claim 1 , wherein Y is selected from phosphate groups, phosphonate groups, sulfate groups, sulfonate groups, and carboxylate groups.

8. The curable rubber composition of claim 1 , wherein Z is selected from alkali metal ions, alkaline earth metal ions, zinc ions, tetraalkylammonium ions, and phosphonium ions.

9. The curable rubber composition of claim 1 , wherein the rubber composition further comprises at least one thermosetting rubber selected from the group consisting of polybutadiene, polyisoprene, poly(styrene-co-butadiene), poly (isobutylene-co-isoprene), natural rubber or a combination thereof.

10. A curable rubber composition that is prepared by a process comprising:
combining ingredients including a reactive ionic surfactant pre-mix that includes a reactive ionic surfactant dissolved or dispersed in a solvent, and a rubber pre-mix that includes one or more rubber components dissolved or dispersed in a solvent,
mixing to form a dispersed mixture, and
removing the solvent.

11. The curable rubber composition of claim 10 , wherein the process further comprises mixing in an internal mixer, twin screw extruder, or two roll mill.

12. The curable rubber composition of claim 10 , wherein the reactive ionic surfactant is represented by the formula:
X—R—Y n− Z n+

where X is a reactive group that reacts with rubber to form a covalent bond, Y is an anionic group formally bearing “n” negative charges, Z is a cationic atom or group formally bearing n positive charges to balance the collective negative charges of Y, n is an integer of from 1 to 3, and R is an organic linking group.

13. The curable rubber composition of claim 10 , wherein the rubber is selected from the group consisting of polybutadiene, polyisoprene, poly(styrene-co-butadiene), poly (isobutylene-co-isoprene), natural rubber or a combination thereof.

14. A method for preparing a curable rubber composition, the method comprising:
combining ingredients including a reactive ionic surfactant pre-mix that includes a reactive ionic surfactant dissolved or dispersed in a solvent, and a rubber pre-mix that includes one or more rubber components dissolved or dispersed in a solvent, wherein the reactive ionic surfactant is represented by the formula:
X—R—Y n− Z n+

where X is a reactive group that reacts with rubber to form a covalent bond, Y is an anionic group formally bearing “n” negative charges, Z is a cationic atom or group formally bearing n positive charges to balance the collective negative charges of Y, n is an integer of from 1 to 3, and R is an organic linking group,
mixing to form a dispersed mixture, and
removing the solvent.

15. The method of claim 14 , wherein the method further comprises mixing the dispersed mixture, after removing the solvent, in an internal mixer, twin screw extruder, or two roll mill.

16. The method of claim 14 , wherein the rubber is selected from the group consisting of polybutadiene, polyisoprene, poly(styrene-co-butadiene), poly (isobutylene-co-isoprene), natural rubber or a combination thereof.

Assignees

• Jia Li
• Qian Mengsha
• Univ Akron

Inventors

• Jia Li
• Qian Mengsha

Classifications

• C08K5/521 Primary

  Esters of phosphoric acids, e.g. of H3PO4 · CPC title

• B29B7/20

  with intermeshing devices, e.g. screws · CPC title

• B29B7/90 Primary

  Fillers or reinforcements {, e.g. fibres} · CPC title

• C08J5/04

  Reinforcing macromolecular compounds with loose or coherent fibrous material · CPC title

• C08L9/00

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title