Antistatic Block Copolymer Pressure Sensitive Adhesives and Articles

• US 20110135921A1
• Filed: 03/03/2009
• Published: 06/09/2011
• Est. Priority Date: 03/07/2008
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Tse, Kiu-Yuen, Yoon, Wanshik, Satrijo, Andrew, Xia, Jianhui, Purgett, Mark D., Everaerts, Albert I., Joseph, Eugene G., Bharti, Vivek
• Application Number:
  US12/919,311
• Publication Number:
  US 20110135921A1
• Time in Patent Office: Days
• US Class Current: 428/355.AC
• CPC Class Codes: C08F 297/026 polymerising acrylic acid, methacrylic acid or derivatives thereof
• CPC Class Codes: C08K 3/017 Antistatic agents
• CPC Class Codes: C08K 5/0075 Antistatics
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 2666/24 Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
• CPC Class Codes: C08L 53/00 Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
• CPC Class Codes: C09J 153/00 Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
• CPC Class Codes: Y10T 428/2891 including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof

Abstract

An antistatic pressure sensitive adhesive composition, useful in electronic and optical display applications, comprising an antistatic agent and a first block copolymer comprising at least two hard A block polymeric units each independently having a Tg of at least 50° C., and at least one soft B block (meth)acrylic polymeric unit having a Tg no greater than 20° C. The composition can comprise a second block copolymer. Articles comprising an antistatic pressure sensitive adhesive composition adjacent a first surface of a substrate.

Claims

1. A composition comprising:

a) an antistatic agent selected from a group consisting of a salt, a metal, an electrically conductive metal oxide, buckminsterfullerene, carbon nanotubes, and a combination thereof; and

b) a first block copolymer comprising

i) at least two hard A block polymeric units each independently having a T_g of at least 50°

C.; and

ii) at least one soft B block (meth)acrylic polymeric unit having a T_g no greater than 20°

C.,

wherein the first block copolymer comprises a total of 10 weight percent to 60 weight percent of the hard A block polymeric units, and wherein the composition is an antistatic pressure sensitive adhesive.

2. The composition of claim 1 wherein the composition is an optically clear antistatic pressure sensitive adhesive.

3. The composition of claim 1 wherein the antistatic agent is a salt, a metal, an electrically conductive metal oxide, or a combination thereof.

4. The composition of claim 3 wherein the salt comprises a fluorinated anion.

5. The composition of claim 3 wherein the salt comprises an organic cation.

6. The composition of claim 1 wherein the first block copolymer comprises a triblock structure, a starblock structure, a multiblock structure, or a combination thereof.

7. The composition of claim 1 wherein at least one of the hard A block polymeric units is prepared from reactants comprising an alkyl (meth)acrylate monomer.

8. The composition of claim 7 wherein the reactants comprise methyl methacrylate.

9. The composition of claim 1 further comprising a second block copolymer comprising at least one hard C block polymeric unit having a T_g of at least 50°

C., and at least one soft D block polymeric unit having a T_g of no greater than 20°

C.

10. The composition of claim 9 wherein the hard C block polymeric unit is prepared from reactants comprising an alkyl (meth)acrylate monomer.

11. The composition of claim 9 wherein the second block copolymer is a diblock copolymer.

12. The composition of claim 1 further comprising a tackifier.

13. The composition of claim 1 further comprising a plasticizer.

14. The composition of claim 1 wherein the antistatic agent comprises a salt and the composition comprises no greater than 15 phr antistatic agent.

15. The composition of claim 1 wherein the antistatic agent comprises a metal oxide and the composition comprises no greater than 100 phr antistatic agent.

16. A composition comprising:

a) an antistatic agent selected from a group consisting of a salt, a metal, an electrically conductive metal oxide, buckminsterfullerene, carbon nanotubes, and a combination thereof; and

b) a first block copolymer comprising

i) at least two hard A block polymeric units each independently prepared from reactants comprising methyl methacrylate and each independently having a T_g of at least 50°

C.; and

ii) at least one soft B block (meth)acrylic polymeric unit having a T_g no greater than 20°

C. and prepared from reactants comprising an alkyl acrylate,

wherein the first block copolymer comprises a total of 10 weight percent to 60 weight percent of the hard A block polymeric units, and wherein the composition is an antistatic pressure sensitive adhesive.

17. The composition of claim 16 wherein the composition is an optically clear antistatic pressure sensitive adhesive.

18. An article comprising:

a) a first substrate having a first surface; and

b) a composition comprising

     1) an antistatic agent selected from a group consisting of a salt, a metal, an electrically conductive metal oxide, buckminsterfullerene, carbon nanotubes, and a combination thereof, and

     2) a first block copolymer comprising

i) at least two hard A block polymeric units each independently having a T_g of at least 50°

C.; and

ii) at least one soft B block (meth)acrylic polymeric unit having a T_g no greater than 20°

C.;

wherein the first block copolymer comprises a total of 10 weight percent to 60 weight percent of the hard A block polymeric units, and wherein the composition is an antistatic pressure sensitive adhesive adjacent the first surface.

19. The article of claim 18 wherein the composition comprises an optically clear antistatic pressure sensitive adhesive.

29. The article of claim 18 wherein the first substrate comprises paper, a release liner, glass, a polymer film, an optical film, an optical element, an optical display, or an electronic device.

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