Isobutylene-containing compositions and articles made thereof

Patent metadata

Field	Value
Publication number	US-12252563-B2
Application number	US-201917054953-A
Country	US
Kind code	B2
Filing date	May 2, 2019
Priority date	May 17, 2018
Publication date	Mar 18, 2025
Grant date	Mar 18, 2025

Abstract

An elastomer composition can comprise a C 4 to C 7 isoolefin; a non-halogenated alkylstyrene; a halogenated alkylstyrene; and optionally a diolefin, wherein the C 4 to C 7 isoolefin is not the same as the diolefin. Optionally, the elastomer composition can be blended with a butyl rubber and/or a halobutyl rubber. Such blends that also comprise additives may be suitable for producing tire components such as innerliners.

First claim

The invention claimed is:

1. A composition comprising:
about 70 parts per hundred parts rubber (phr) to about 90 phr of a halobutyl rubber; and
about 10 phr to about 30 phr of an elastomer composition,
wherein the elastomer composition comprises:
a C 4 to C 7 isoolefin;
a non-halogenated alkylstyrene; and
a halogenated alkylstyrene,
wherein the non-halogenated alkylstyrene and the halogenated alkylstyrene cumulatively are present in the elastomer composition in the amount of about 3 wt % to about 15 wt % based on the elastomer composition; and
wherein the halogenated alkylstyrene is present at from 0.1 mol % to 2 mol % relative to the non-halogenated alkylstyrene;
wherein the sum of the phr of the halobutyl rubber and the phr of the elastomer composition is about 100.

2. The composition of claim 1 , wherein the elastomer composition further comprises:
a diolefin, wherein the C 4 to C 7 isoolefin is not the same as the diolefin.

3. The composition of claim 2 , wherein the diolefin is isoprene, butadiene, cyclopentadiene, or combinations thereof.

4. The composition of claim 2 , wherein the diolefin is present in the elastomer composition in the amount of less than or equal to about 10 wt % based on the elastomer composition.

5. The composition of claim 2 , wherein the C 4 to C 7 isoolefin is halogenated.

6. The composition of claim 1 , wherein the C 4 to C 7 isoolefin is halogenated with bromine.

7. The composition of claim 1 , wherein the non-halogenated alkylstyrene is p-methylstyrene.

8. The composition of claim 1 , wherein the composition has a glass transition temperature of about −39° C. to about −32° C.

9. The composition of claim 1 , wherein the halobutyl rubber is selected from the group consisting of: bromobutyl rubber, chlorobutyl rubber, and combinations thereof.

10. The composition of claim 1 , wherein the halobutyl rubber is selected from the group consisting of: brominated isobutylene-isoprene rubber, chlorinated isobutylene-isoprene rubber, brominated isobutylene-co-p-methylstyrene copolymer, and combinations thereof.

11. The composition of claim 1 further comprising:
processing aid;
curative; and
filler.

12. The composition of claim 11 , wherein the filler is carbon black and present at about 20 to about 100 phr.

13. The composition of claim 11 , wherein the filler is clay and present at about 1 to about 30 phr.

14. A process to make the composition of claim 1 , comprising the steps of:
a. polymerizing, in a first reactor, the C 4 to C 7 isoolefin, the non-halogenated alkylstyrene, the halogenated alkylstyrene, optionally a diolefin, and optionally a isobutylene-p-methylstyrene;
b. polymerizing, in a second reactor, monomers of the halobutyl rubber, wherein the monomers comprise isobutylene derived units, isoprene derived units, p-methylstyrene derived units, p-bromomethylstyrene derived units, or a combination thereof;
c. combining product streams from the first and second reactors to produce a blend; and
d. optionally combining the blend with a processing aid, a curative, and a filler.

15. A process to make the composition of claim 1 , comprising the steps of:
a. polymerizing, in a first reactor, the C 4 to C 7 isoolefin, the non-halogenated alkylstyrene, the halogenated alkylstyrene, optionally a diolefin, and optionally a isobutylene-p-methylstyrene to produce the elastomer composition;
b. polymerizing, in a second reactor, monomers of the halobutyl rubber to produce the halobutyl rubber, wherein the monomers comprise isobutylene derived units, isoprene derived units, p-methylstyrene derived units, p-bromomethylstyrene derived units, or a combination thereof; and
c. optionally combining the elastomer composition, the halobutyl rubber, optionally a processing aid, optionally a curative, and optionally a filler.

16. An article comprising the composition of claim 1 .

17. A tire innerliner comprising the composition of claim 1 .

18. A tire comprising the tire innerliner of claim 17 .

Assignees

• Exxonmobil Chemical Patents Inc
• Exxonmobil Engineering & Tech Company

Inventors

• Jacob Sunny
• Nair Sujith
• Chen Yuan-Ju

Classifications

• C08K3/346

  Clay · CPC title

• C08K3/04

  Carbon · CPC title

• C08F210/10

  Isobutene · CPC title

• B60C1/0008

  Compositions of the inner liner · CPC title

• C08F212/18

  Chlorine · CPC title