Modified isobutylene-isoprene rubber, production method for same and cured material of same

Patent metadata

Field	Value
Publication number	US-10364301-B2
Application number	US-201615542347-A
Country	US
Kind code	B2
Filing date	Jan 15, 2016
Priority date	Jan 29, 2015
Publication date	Jul 30, 2019
Grant date	Jul 30, 2019

Abstract

The present invention provides: a modified isobutylene-isoprene rubber including a structural unit of Chemical Formula I, a production method for the same, and a cured material formed by thermally curing the same (in Chemical Formula I, X is an alkyl group including at least two carboxyl groups). The modified isobutylene-isoprene rubber exhibits excellent characteristics in terms of adhesive properties, flexibility, water vapor transmission resistance and transparency.

First claim

The invention claimed is:

1. A modified isobutylene-isoprene rubber (IIR) comprising a structural unit of the following Chemical Formula 1:

wherein in Chemical Formula 1, X is a functional group represented by the following Chemical Formula 3:

wherein in Chemical Formula 3, R 3 to R 8 are each independently a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms; or hydrogen.

2. The modified isobutylene-isoprene rubber of claim 1 , wherein the modified isobutylene-isoprene rubber comprises 0.5 mol % to 5.0 mol % of the structural unit of Chemical Formula 1 in the entire structural units of the modified isobutylene-isoprene rubber.

3. The modified isobutylene-isoprene rubber of claim 1 , wherein the modified isobutylene-isoprene rubber comprises 95.0 mol % to 99.5 mol % of a structural unit of the following Chemical Formula 5 in the entire structural units of the modified isobutylene-isoprene rubber:

4. The modified isobutylene-isoprene rubber of claim 1 , wherein the modified isobutylene-isoprene rubber does not comprise a sulfur atom and a halogen atom.

5. A cured material formed by thermally curing a thermosetting composition comprising the modified isobutylene-isoprene rubber of claim 1 and a thermo-curing agent.

6. The cured material of claim 5 , wherein the cured material does not include a sulfur atom, a halogen atom, and a tackifier.

7. The cured material of claim 5 , wherein the composition further comprises at least one selected from the group consisting of a cyclic acid anhydride comprising a carbon-carbon double bond, a polyolefin-based polymer comprising a cyclic acid anhydride skeleton, carboxylic acid, a polyolefin-based polymer comprising a carboxyl group, and a combination thereof.

8. The cured material of claim 5 , wherein the cured material has a gel fraction of 10% or more.

9. The cured material of claim 5 , wherein an optical adhesive film is formed as a cured material by thermally curing the thermosetting composition, and the adhesive film has an adhesive strength of 500 g/in to 6,000 g/in.

10. A method for producing a modified isobutylene-isoprene rubber (IIR), the method comprising:
preparing a raw material composition by mixing an isobutylene-isoprene rubber with a solvent;
forming an intermediate product by adding a cyclic acid anhydride comprising a carbon-carbon double bond and a radical initiator to the raw material composition to react the isobutylene-isoprene rubber with the cyclic acid anhydride comprising the carbon-carbon double bond; and
carrying out a hydrolysis reaction by adding an aqueous acidic solution or an aqueous basic solution to a raw material composition comprising the intermediate product,
wherein the cyclic acid anhydride comprising the carbon-carbon double bond comprises a compound represented by the following Chemical Formula 7:

wherein in Chemical Formula 7, R 3 to R 8 are each independently hydrogen; or a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms.

11. The method of claim 10 , wherein the intermediate product is formed so as to comprise a structural unit of the following Chemical Formula 9:

wherein in Chemical Formula 9, Y is a derivative derived from the cyclic acid anhydride represented by Chemical Formula 7.

12. The method of claim 10 , wherein the intermediate product may allow the hydrolysis reaction to proceed, so that a modified isobutylene-isoprene rubber comprising a structural unit of the following Chemical Formula 1 is produced:

wherein in Chemical Formula 1, X is a a functional group represented by the following Chemical Formula 3:

wherein in Chemical Formula 3, R 3 to R 8 are each independently a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms; or hydrogen.

13. The method of claim 10 , wherein in the preparing of the raw material composition, the isobutylene-isoprene rubber comprises 95.0 mol % to 99.5 mol % of a structural unit of the following Chemical Formula 5 and 0.5 mol % to 5.0 mol % of a structural unit of the following Chemical Formula 13:

14. The method of claim 10 , wherein 0.5 part by weight to 10 parts by weight of the cyclic acid anhydride comprising the carbon-carbon double bond is added to the isobutylene-isoprene rubber based on 100 parts by weight of the isobutylene-isoprene rubber.

15. The method of claim 10 , wherein for a predetermined time before the cyclic acid anhydride comprising the carbon-carbon double bond and the radical initiator are added to the raw material composition, nitrogen purging is carried out.

Assignees

• Lg Chemical Ltd

Inventors

• Seo Kwang-Su
• Kim Jang-Soon

Classifications

• C08L51/06

  grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond · CPC title

• C09J113/00

  Adhesives based on rubbers containing carboxyl groups · CPC title

• C08L13/00

  Compositions of rubbers containing carboxyl groups · CPC title

• C08C19/28 Primary

  Reaction with compounds containing carbon-to-carbon unsaturated bonds (graft polymers C08F279/00) · CPC title

• C09J7/10

  without carriers · CPC title