Ordered architectures in acrylic polymers

• US 9,644,063 B2
• Filed: 05/17/2011
• Issued: 05/09/2017
• Est. Priority Date: 05/19/2010
• Status: Active Grant

• Current Assignee: Avery Dennison Corporation
• Original Assignee: Avery Dennison Corporation
• Inventors: Miller, Brandon S., Heimbach, Kyle R., Bottorf, William L., Lester, Christopher, Bartholomew, Eric L.
• Primary Examiner(s): Zemel, Irina S
• Assistant Examiner(s): LENIHAN, JEFFREY S
• Application Number:
  US13/697,696
• Publication Number:
  US 20130059971A1
• Time in Patent Office: 2,184 Days
• Field of Search: 525242, 525299, 524543, 524560
• CPC Class Codes: C08F 2438/03 Use of a di- or tri-thiocarbonylthio compound, e.g. di- or tri-thioester, di- or tri-thiocarbamate, or a xanthate as chain transfer agent, e.g . Reversible Addition Fragmentation chain Transfer [RAFT] or Macromolecular Design via Interchange of Xanthates [MADIX]
• CPC Class Codes: C08F 293/005 using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent
• 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: C09J 153/005 Modified block copolymers

Abstract

Polymers having ordered architectures and one or more reactive functional groups incorporated in select blocks or regions of the polymer in particular proportions relative to other regions in the polymer, are described. The polymers are well suited for use in adhesive compositions, and particularly for pressure sensitive adhesive compositions. In addition, various methods for forming the noted polymers and adhesive compositions utilizing the ordered polymers are disclosed.

Claims

1. An ordered polymer comprising at least two different blocks, including one or more blocks A placed at a first region within the polymer and one or more blocks B placed at a second region within the polymer, and at least one reactive functional group apportioned between the blocks A and B wherein an amount of the at least one reactive functional group in both blocks A and B is apportioned between the blocks A and Bin an apportionment ratio of from about 6:

1 to about 10,000;

1,

wherein the glass transition temperature (Tg) of the ordered polymer is about −

45°

C. to about −

60°

C.

2. The ordered polymer of claim 1 wherein the apportionment ratio is from 6:

1 to 1,000;

1.

3. The ordered polymer of claim 1 wherein the apportionment ratio is from 6:

1 to 100;

1.

4. The ordered polymer of claim 1 wherein the block A comprises a monomer selected from the group consisting of acrylate monomers, methacrylate monomers, and combinations thereof;

and the block B including a polymerizable acrylate comonomer, the blocks A and B including at least one reactive functional group selected from the group consisting of acrylonitrile groups, acrylamide groups, methacrylamide groups, vinyl ester groups, vinyl ether groups, vinyl amide groups, vinyl ketone groups, styrene groups, halogen-containing groups, ionic groups, acid-containing groups, base-containing groups, olefin groups, silane groups, epoxy groups, hydroxyl groups, anhydride groups, silyl groups, carboxyl groups, carbonyl groups, carbonate ester groups, isocyanato groups, amino groups, amide groups, imide groups, mercapto groups, acetoacetyl groups, and combinations thereof.

5. The ordered polymer of claim 1 wherein the polymer has a number average molecular weight of from about 10,000 to about 300,000.

6. The ordered polymer of claim 1 wherein the polymer has a number average molecular weight of from about 50,000 to about 200,000.

7. The ordered polymer of claim 1 wherein the polymer has a number average molecular weight of from about 100,000 to about 150,000.

8. The ordered polymer of claim 1 wherein the first region is an end region of a polymer and the second region is a middle region of the polymer.

9. The ordered polymer of claim 1 wherein the first region is a middle region of the polymer and the second region is an end region of the polymer.

10. The ordered polymer of claim 1 wherein the glass transition temperature (Tg) of the one or more blocks A is about −

28°

C. to about −

46°

C.

11. The ordered polymer of claim 1 wherein the glass transition temperature (Tg) of the one or more blocks B is about −

47°

C. to about −

61°

C.

12. A pressure sensitive adhesive composition comprising:

an ordered polymer including at least two different blocks, including one or more blocks A placed at a first region within the polymer and one or more blocks B placed at a second region within the polymer, and at least one reactive functional group apportioned between the blocks A and B wherein an amount of the at least one reactive functional group in both blocks A and B is apportioned between the blocks A and Bin an apportionment ratio of from about 6;

1 to about 10,000;

1; and

a crosslinking agent,

wherein the glass transition temperature (Tg) of the ordered polymer is about −

45°

C. to about −

60°

C.

13. The adhesive composition of claim 12 wherein the apportionment ratio is from 6:

1 to 1,000;

1.

14. The adhesive composition of claim 12 wherein the apportionment ratio is from 6:

1 to 100;

1.

15. The adhesive composition of claim 12 wherein the polymer has a number average molecular weight of from about 10,000 to about 300,000.

16. The adhesive composition of claim 12 wherein the polymer has a number average molecular weight of from about 50,000 to about 200,000.

17. The adhesive composition of claim 12 wherein the polymer has a number average molecular weight of from about 100,000 to about 150,000.

18. The adhesive composition of claim 12 wherein the composition further comprises at least one agent selected from the group consisting of tackifiers, plasticizers, antioxidants, pH controllers, medicaments, bactericides, growth factors, wound healing components, deodorants, perfumes, antimicrobials, fungicides, cutting agents, pigments, filler, diluents, flame retardants, and combinations thereof.

19. The adhesive composition of claim 12 wherein the first region is an end region of a polymer and the second region is a middle region of the polymer.

20. The adhesive composition of claim 12 wherein the first region is a middle region of the polymer and the second region is an end region of the polymer.

21. The adhesive composition of claim 12 wherein the glass transition temperature (Tg) of the one or more blocks A is about −

28°

C. to about −

46°

C.

22. The adhesive composition of claim 12 wherein the glass transition temperature (Tg) of the one or more blocks B is about −

47°

C. to about −

61°

C.

23. The adhesive composition of claim 12 wherein the crosslinking agent is from about 0.05% to about 5% by weight of adhesive solids.

24. The adhesive composition of claim 12 wherein the crosslinking agent is aluminum acetyl acetonoate.

25. The adhesive composition of claim 12 wherein the block A comprises a monomer selected from the group consisting of acrylate monomers, methacrylate monomers, and combinations thereof;

and the block B including a polymerizable acrylate comonomer, the blocks A and B including at least one reactive functional group selected from the group consisting of acrylonitrile groups, acrylamide groups, methacrylamide groups, vinyl ester groups, vinyl ether groups, vinyl amide groups, vinyl ketone groups, styrene groups, halogen-containing groups, ionic groups, acid-containing groups, base-containing groups, olefin groups, silane groups, epoxy groups, hydroxyl groups, anhydride groups, silyl groups, carboxyl groups, carbonyl groups, carbonate ester groups, isocyanato groups, amino groups, amide groups, imide groups, mercapto groups, acetoacetyl groups, and combinations thereof.

26. A pressure sensitive adhesive composition comprising:

an ordered polymer including at least two different blocks, including one or more blocks A placed at a first region within the polymer and one or more blocks B placed at a second region within the polymer, and at least one reactive functional group apportioned between the blocks A and B wherein an amount of the at least one reactive functional group in both blocks A and B is apportioned between the blocks A and Bin an apportionment ratio of from about 6;

1 to about 10,000;

1, and

a crosslinking agent,

wherein the first region is an end region of the polymer and the second region is a middle region of the polymer.

27. The adhesive composition of claim 26 wherein the block A comprises a monomer selected from the group consisting of acrylate monomers, methacrylate monomers, and combinations thereof;

and the block B including a polymerizable acrylate comonomer, the blocks A and B including at least one reactive functional group selected from the group consisting of acrylonitrile groups, acrylamide groups, methacrylamide groups, vinyl ester groups, vinyl ether groups, vinyl amide groups, vinyl ketone groups, styrene groups, halogen-containing groups, ionic groups, acid-containing groups, base-containing groups, olefin groups, silane groups, epoxy groups, hydroxyl groups, anhydride groups, silyl groups, carboxyl groups, carbonyl groups, carbonate ester groups, isocyanato groups, amino groups, amide groups, imide groups, mercapto groups, acetoacetyl groups, and combinations thereof.