Adhesives comprising grafted isobutylene copolymer

Patent metadata

Field	Value
Publication number	US-9587150-B2
Application number	US-201314415777-A
Country	US
Kind code	B2
Filing date	Aug 12, 2013
Priority date	Aug 14, 2012
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

An adhesive composition is described comprising a tackifier and at least one grafted isobutylene copolymer. The grafted isobutylene copolymer has the formula: R 1 —(R 2 —Z) wherein R 1 represents an isobutylene copolymer, R 2 is a covalent bond or multivalent alkylene or arylene, and Z is a grafted polymer. Z is typically a homopolymer of copolymer comprising alkene repeat units, aralkylene repeat units, or a combination thereof. Also described are adhesive coated articles, methods of making adhesive coated articles, and grafted isobutylene polymers.

First claim

What is claimed is:

1. An adhesive composition comprising a tackifier and at least one grafted isobutylene copolymer having the formula:

wherein Z is the grafted polymer, a is at least 20; the sum of b and c is at least one, and d is zero.

2. The adhesive composition of claim 1 wherein Z comprises alkene repeat units, aralkylene repeat units, or a combination thereof.

3. The adhesive composition of claim 2 wherein Z is derived from C 4 -C 20 alkene monomers comprising at least two carbon-carbon double bonds.

4. The adhesive composition of claim 1 wherein Z is a grafted homopolymer.

5. The adhesive composition of claim 4 wherein Z comprises aralkylene repeat units and Z physically crosslinks.

6. The adhesive composition of claim 4 wherein Z comprises alkene repeat units and unsaturations of the alkene repeat units crosslink the grafted polymer.

7. The adhesive composition of claim 1 wherein Z is a grafted copolymer.

8. The adhesive composition of claim 1 wherein the grafted isobutylene copolymer comprises 0.01 to 40 wt.-% of repeat units that comprise the grafted polymer Z.

9. The adhesive composition of claim 1 wherein said grafted isobutylene copolymer is prepared by reacting anionically polymerized reactive polymers with halogenated isobutylene copolymer.

10. The adhesive composition of claim 1 wherein the grafted isobutylene copolymer is prepared from an isobutylene copolymer that has a weight average molecular weight (M w ) of 50,000 to 2,000,000 g/mole.

11. The adhesive composition of claim 1 wherein said grafted polymer, Z, has a number average molecular weight ranging from 1,000 to 30,000 g/mole.

12. The adhesive composition of claim 1 wherein the adhesive composition further comprises a second isobutylene polymer and the second isobutylene polymer is ungrafted, unfunctionalized, or ungrafted and unfunctionalized.

13. The adhesive composition of claim 1 wherein the adhesive composition comprises 10 to 50 wt.-% tackifier.

14. An adhesive article comprising the adhesive of claim 1 applied to a substrate.

Assignees

• 3M Innovative Properties Co

Inventors

• Lee Hae-Seung
• Janoski Jonathan E
• Chatterjee Joon
• Lewandowski Kevin M
• Gaddam Babu N

Classifications

• C09J123/22 Primary

  Copolymers of isobutene; Butyl rubber {; Homo- or copolymers of other iso-olefines} · CPC title

• B05D5/00

  Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures · CPC title

• C09J151/06 Primary

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

• C08L51/06

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

• Y10T428/2878

  including addition polymer from unsaturated monomer · CPC title