Pressure-sensitive adhesive composition

Patent metadata

Field	Value
Publication number	US-9290682-B2
Application number	US-201214345312-A
Country	US
Kind code	B2
Filing date	Nov 12, 2012
Priority date	Nov 18, 2011
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

Disclosed is an adhesive composition comprising a low T g (meth)acrylate copolymer component, a high T g (meth)acrylate copolymer component, and a hydrogenated hydrocarbon tackifier. This disclosure provides a pressure-sensitive adhesive and pressure-sensitive adhesive articles that are particularly useful in the bonding of low surface energy (LSE) substrates.

First claim

What is claimed is:

1. An adhesive composition comprising:
a) 60 parts by weight or greater of a low T g (meth)acrylate solute copolymer component having a T g of <20° C. comprising
i. C 1 -C 18 (meth)acrylic acid ester monomer units;
ii. acid functional ethylenically unsaturated monomer units;
iii. optionally non-acid functional, ethylenically unsaturated polar monomer units;
iv. optionally vinyl monomer units; and
v. optionally a multifunctional (meth)acrylate, and

b) 5 to 40 parts by weight of a high T g (meth)acrylate copolymer having a M w ≧30 k and a T g of >50° C. comprising:
i. high T g (meth)acrylic acid ester monomer units;
ii) optional acid functional ethylenically unsaturated monomer units;
iii) optional low T g (meth)acrylic acid ester monomer units;
iv) optional non-acid functional, ethylenically unsaturated polar monomer units;
v) optional vinyl monomer units;
the sum of a) and b) being 100 parts by weight; and

c) 0.1 to 20 parts be weight of a hydrogenated hydrocarbon tackifier, based on 100 parts by weight of a), and b);
wherein the tackifier is incompatible with a), and b).

2. The adhesive composition of claim 1 wherein the low T g (meth)acrylate copolymer component comprises syrup copolymer comprising a solute low T g copolymer in solvent monomer(s).

3. The adhesive composition of claim 2 wherein the low T g solute copolymer comprises:
i. 85 to 99.5 parts by weight of an (meth)acrylic acid ester;
ii. 0.5 to 15 parts by weight of an acid functional ethylenically unsaturated monomer;
iii. 0 to 10 parts by weight of a non-acid functional, ethylenically unsaturated polar monomer;
iv. 0 to 5 parts vinyl monomer; and
v. 0 to 5 parts of a multifunctional (meth)acrylate;
based on 100 parts by weight total monomer.

4. The adhesive composition of claim 2 wherein the syrup copolymer comprises up to 30 parts by weight of the solute copolymer in solvent monomers.

5. The adhesive composition of claim 2 wherein the syrup copolymer a) has a viscosity of from 500 to 10,000 cPs at 22° C.

6. The adhesive composition of claim 2 , wherein the a solvent monomer comprises a mixture of:
i) an alkyl (meth)acrylate monomer;
ii) an optional acid-functional ethylenically unsaturated monomer;
iii) an optional non-acid functional polar monomer;
iv) an optional vinyl monomer, and
v) an optional multifunctional (meth)acrylate.

7. The adhesive composition of claim 1 , wherein the low T g (meth)acrylate copolymer component a) comprises solution copolymer comprising a solute low T g copolymer in a solvent.

8. The adhesive composition of claim 1 , wherein the high T g monomer is selected from t-butyl acrylate, methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, s-butyl methacrylate, t-butyl methacrylate, stearyl methacrylate, phenyl methacrylate, cyclohexyl methacrylate, isobornyl acrylate, isobornyl methacrylate, benzyl methacrylate, 3,3,5 trimethylcyclohexyl acrylate, cyclohexyl acrylate, N-octyl acrylamide, and propyl methacrylate or combinations thereof.

9. The adhesive composition of claim 1 further comprising d) a crosslinking agent.

10. The adhesive composition of claim 1 wherein the crosslinking agent is a triazine crosslinking agent.

11. The adhesive composition of claim 1 , wherein the (meth)acrylic acid ester monomer units of said low T g copolymer comprises acrylic esters of 2-octanol, citronellol, or dihydrocitronellol.

12. The adhesive composition of claim 1 , wherein the (meth)acrylic acid ester monomer units of said low T g copolymer comprises acrylic esters of 2-alkyl alkanols.

13. The adhesive composition of claim 1 , comprising1 to 15 parts by weight of the hydrogenated hydrocarbon tackifer, relative to 100 parts of the low- and high- T g (co)polymer components.

14. The adhesive composition of claim 1 , comprising 2 to 10 parts by weight of the hydrogenated hydrocarbon tackifer, relative to 100 parts of the low- and high- T g (co)polymer components.

15. An adhesive article comprising a substrate and a coating of the adhesive of claim 1 on a surface thereof.

16. The adhesive article of claim 15 wherein the substrate is a low surface energy substrate.

17. The adhesive composition of claim 1 wherein the low T g solute copolymer comprises:
ia. 65 to 98.5 parts by weight of an (meth)acrylic acid ester monomer;
ib. 1 to 20 parts by weight of high T g (meth)acrylic acid ester monomers;
ii. 0.5 to 15 parts by weight of an acid-functional ethylenically unsaturated monomer;
iii. 0 to 10 parts by weight of a non-acid functional, ethylenically unsaturated polar monomer;
iv. 0 to 5 parts vinyl monomer; and
v. 0 to 5 parts of a multifunctional (meth)acrylate;
based on 100 parts by weight total monomers of the low T g copolymer.

Assignees

• 3M Innovative Properties Co

Inventors

• Chen Zhong
• Anderson Kelly S
• Ma Jingjing
• Rexeisen Emilie L

Classifications

• C09J133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09J133/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• Y10T428/2891

  including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof · CPC title

• C09J11/08

  Macromolecular additives · CPC title