Isobutylene-containing compositions and articles made thereof

Patent metadata

Field	Value
Publication number	US-12415915-B2
Application number	US-201816971222-A
Country	US
Kind code	B2
Filing date	Dec 5, 2018
Priority date	Feb 20, 2018
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

The present invention provides a composition having a C 4 to C 7 isoolefin, an alkylstyrene, and a diolefin, where the C 4 to C 7 isoolefin is not the same as the diolefin. The invention also provides a composition having a first C 4 to C 7 isoolefin and paramethylstyrene component and a second C 4 to C 7 isoolefin and paramethylstyrene component. Further, the invention also provides a composition having (a) an elastomer with a C 4 to C 7 isoolefin, an alkylstyrene, and a diolefin, where the C 4 to C 7 isoolefin is not the same as the diolefin, (b) a secondary rubber, (c) processing aid, (d) curative, and (e) filler.

First claim

The invention claimed is:

1. A terpolymer composition comprising:
a. a C 4 to C 7 isoolefin;
b. an alkylstyrene; and
c. a diolefin, wherein the C 4 to C 7 isoolefin is not the same as the diolefin;
wherein the C 4 to C 7 isoolefin is present in the terpolymer composition in an amount of less than or equal to about 90 wt % based on the terpolymer composition;
wherein the alkylstyrene is present in the terpolymer composition in an amount of greater than or equal to about 10 wt % based on the terpolymer composition;
wherein the diolefin is present in the terpolymer composition in an amount of less than or equal to about 10 wt % based on the terpolymer composition;
wherein the terpolymer composition has a number average molecular weight in a range from 111,000 to 115,000 g/mol and a molecular weight distribution (Mw/Mn) of less than 3.2, and a z-average molecular weight (Mz) in a range from 653,800 to 702,500 g/mol; and
wherein the terpolymer composition has a Mooney viscosity ML (1+8) at 125° C. of less than 27 or about 34.

2. The terpolymer composition of claim 1 , wherein the C 4 to C 7 isoolefin is halogenated.

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

4. The terpolymer composition of claim 1 , wherein the alkylstyrene is halogenated.

5. The terpolymer composition of claim 1 , wherein the alkylstyrene is paramethylstyrene.

6. The terpolymer composition of claim 5 , wherein the paramethylstyrene is present in an amount of less than or equal to about 20 wt % based on the terpolymer composition.

7. The terpolymer composition of claim 1 , wherein the diolefin is isoprene, butadiene, cyclopentadiene, or combinations thereof.

8. The terpolymer composition of claim 1 , wherein the C 4 to C 7 isoolefin is isobutylene.

9. The terpolymer composition of claim 1 , wherein the terpolymer composition has a molecular weight (Mw) in a range from 329,400 to 356,900 g/mol.

10. A process to make the terpolymer composition of claim 1 , comprising the steps of
a. polymerizing the C 4 to C 7 isoolefin, the alkylstyrene, and the diolefin; and
b. recovering the terpolymer composition.

11. A composition comprising:
a. an elastomer having
i. a C 4 to C 7 isoolefin;
ii. an alkylstyrene;
iii. a diolefin, wherein the C 4 to C 7 isoolefin is not the same as the diolefin;

wherein the C 4 to C 7 isoolefin is present in the composition in an amount of less than or equal to about 90 wt % based on the composition;
wherein the alkylstyrene is present in the composition in an amount of greater than or equal to about 10 wt % based on the composition;
wherein the diolefin is present in the composition in an amount of less than or equal to about 10 wt % based on the composition;
wherein the elastomer has a number average molecular weight in a range from 111,000 to 115,000 and a molecular weight distribution (Mw/Mn) of less than 3.2, and a z-average molecular weight (Mz) in a range from 653,800 to 702,500;
wherein the elastomer has a Mooney viscosity ML (1+8) at 125°° C. of less than 27 or about 34; and
b. a secondary rubber;
c. processing aid;
d. curative; and
e. filler.

12. The composition of claim 11 , further comprising from about 20 to about 100 phr carbon black.

13. The composition of claim 11 , further comprising from about 1 to about 30 phr clay.

14. A process to make the composition of claim 11 , comprising the steps of
a. polymerizing the C 4 to C 7 isoolefin, the alkylstyrene, and the diolefin to recover the elastomer;
b. combining the elastomer, the secondary rubber, the processing aid, the curative, and the filler; and
c. recovering the composition.

15. An article comprising the composition of claim 11 .

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Jacob Sunny
• Chen Yuan-Ju
• Nair Sujith
• D′Cruz Bemard

Classifications

• C08K3/346

  Clay · CPC title

• C08K3/04

  Carbon · CPC title

• C08L23/22 Primary

  Copolymers of isobutene; Butyl rubber; Homopolymers or copolymers of other iso-olefins · CPC title