ADHESIVE COMPOSITIONS AND ARTICLES

• US 20190322904A1
• Filed: 12/12/2017
• Published: 10/24/2019
• Est. Priority Date: 12/19/2016
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Chastek, Thomas Q., Waid, Robert D., Wang, Shujun J., DeVolder, Ross J., Eckhardt, Doreen
• Granted Patent: US 11,920,067 B2
• Time in Patent Office: Days
• CPC Class Codes: C08L 33/02 Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• CPC Class Codes: C08L 35/00 Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical, and containing at least one other carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 45/00 Compositions of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Compositions of derivatives of such polymers of cyclic anhydrides or imides C08L35/00; of cyclic esters of polyfunctional acids C08L31/00
• CPC Class Codes: C09J 11/08 Macromolecular additives
• CPC Class Codes: C09J 153/02 Vinyl aromatic monomers and conjugated dienes
• CPC Class Codes: C09J 2301/408 additives as essential feature of the adhesive layer
• CPC Class Codes: C09J 2301/414 presence of a copolymer
• CPC Class Codes: C09J 2400/243 in the substrate
• CPC Class Codes: C09J 2409/00 Presence of diene rubber
• CPC Class Codes: C09J 2423/00 Presence of polyolefin
• CPC Class Codes: C09J 2453/00 Presence of block copolymer
• CPC Class Codes: C09J 2461/00 Presence of condensation polymers of aldehydes or ketones
• CPC Class Codes: C09J 7/26 Porous or cellular plastics
• CPC Class Codes: C09J 7/387 Block-copolymers
• CPC Class Codes: Y10T 428/2809 including irradiated or wave energy treated component
• CPC Class Codes: Y10T 428/2883 including addition polymer of diene monomer [e.g., SBR, SIS, etc.]

Abstract

Pressure-sensitive adhesive compositions and articles that include a layer of the pressure-sensitive adhesive compositions are provided. The pressure-sensitive adhesive compositions are particularly well suited for use with substrates that have been considered to have difficult to bond to surfaces such as those routinely encountered in the automotive industry. For example, the pressure-sensitive adhesive can be adhered to clear coat compositions, painted surfaces, and various polymeric materials having low energy surfaces (e.g., surfaces having a surface energy no greater than 35 dynes per centimeter).

Claims

1. A pressure-sensitive adhesive composition comprising:

a) a styrenic component comprising a first styrenic block copolymer having at least one rubbery block and at least two glassy blocks;

b) a first tackifier that is a linear (meth)acrylic-based polymeric material having a glass transition temperature equal to at least 50°

C. and having a weight average molecular weight in a range of 5,000 to 200,000 Daltons; and

c) a second tackifier that is compatible with the rubbery block of the styrenic block copolymer, the second tackifier being an aliphatic hydrocarbon tackifier, a terpene resin, a terpene phenolic resin, or a mixture thereof.

2. The pressure-sensitive adhesive of claim 1, wherein the first styrenic block copolymer comprises 5 to 50 weight percent glassy blocks based on a total weight of the first styrenic copolymer.

3. The pressure-sensitive adhesive of claim 1, wherein the first styrenic copolymer is a linear triblock copolymer comprising 10 to 35 weight percent glassy blocks and 65 to 90 weight percent rubbery block.

4. The pressure-sensitive adhesive composition of claim 1, wherein the styrenic component further comprises a second styrenic copolymer that is a styrenic diblock copolymer having a single glassy block and a single rubbery block.

5. The pressure-sensitive adhesive composition of claim 1, wherein the styrenic diblock copolymer comprises 10 to 50 weight percent glassy block and 50 to 90 weight percent rubbery block.

6. The pressure-sensitive adhesive composition of claim 4, wherein the styrenic component comprises 70 to 100 weight percent first styrenic block copolymer and 0 to 30 weight percent second styrenic block copolymer based on a total weight of the styrenic component.

7. The pressure-sensitive adhesive composition of claim 1, wherein the first tackifier comprises a polymerized product of a first monomer composition comprising 30 to 100 weight percent of an alkyl (meth)acrylate having a Tg greater than 50°

C. when polymerized as a homopolymer, 0 to 15 weight percent of a polar monomer, 0 to 50 weight percent of an alkyl (meth)acrylate having a Tg no greater than 20°

C. when polymerized as a homopolymer, and 0 to 5 weight percent of a vinyl monomer that does not contain a (meth)acryloyl group.

8. The pressure-sensitive adhesive composition of claim 1, wherein the pressure-sensitive adhesive comprises 1 to 25 weight percent of the first tackifier based on a total weight of the pressure-sensitive adhesive composition.

9. The pressure-sensitive adhesive composition of claim 1, wherein the pressure-sensitive adhesive comprises 10 to 50 weight percent of the second tackifier based on a total weight of the pressure-sensitive adhesive composition.

10. The pressure-sensitive adhesive compositions of claim 1, wherein the pressure-sensitive adhesive composition comprises 40 to 60 weight percent styrenic component, 1 to 25 weight percent (meth)acrylic-based polymeric tackifier, and 10 to 50 weight percent second tackifier.

11. The pressure-sensitive adhesive composition of claim 1, wherein the pressure-sensitive adhesive composition further comprises an elastomeric (meth)acrylic-based polymeric material.

12. The pressure-sensitive adhesive composition of claim 1, wherein the pressure-sensitive adhesive composition is radiation crosslinked using electron beam radiation.

13. An article comprising:

a first substrate; and

a first pressure-sensitive adhesive layer positioned adjacent to the first substrate, wherein the pressure-sensitive adhesive layer comprises a pressure-sensitive adhesive composition comprising

a) a styrenic component comprising a first styrenic block copolymer having at least one rubbery block and at least two glassy blocks;

b) a first tackifier that is a linear (meth)acrylic-based polymeric material having a glass transition temperature equal to at least 50°

C. and having a weight average molecular weight in a range of 5,000 to 200,000 Daltons; and

c) a second tackifier that is compatible with the rubbery block of the styrenic block copolymer, the second tackifier being an aliphatic hydrocarbon tackifier, a terpene resin, a terpene phenolic resin, or a mixture thereof.

14. The article of claim 13, wherein the first substrate is a foam.

15. The article of claim 13, wherein the article is free of a primer layer between the first substrate and the pressure-sensitive adhesive layer.