MULTI-BASE MATERIAL ADAPTIVITY PULLING REMOVAL TYPE BINDER PRODUCT, BINDER COMPOSITION AND ASSEMBLY

• US 20170335038A1
• Filed: 12/21/2015
• Published: 11/23/2017
• Est. Priority Date: 12/31/2014
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Li, Jun
• Granted Patent: US 10,167,357 B2
• Time in Patent Office: Days
• CPC Class Codes: C08F 220/06 Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
• CPC Class Codes: C08G 18/4063 Mixtures of compounds of group C08G18/62 with other macromolecular compounds
• CPC Class Codes: C08G 18/6254 Polymers of alpha-beta ethylenically unsaturated carboxylic acids and of esters of these acids containing hydroxy groups
• CPC Class Codes: C08G 18/69 Polymers of conjugated dienes hydrogenated polymers of conjugated dienes C08G18/6208
• CPC Class Codes: C08L 19/006 Rubber characterised by functional groups, e.g. telechelic diene polymers
• CPC Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• CPC Class Codes: C08L 93/04 Rosin
• CPC Class Codes: C09J 133/02 Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• CPC Class Codes: C09J 175/04 Polyurethanes

Abstract

The present disclosure provides a multi-base material adaptivity pulling removal type binder product, a binder position and an assembly. The binder product contains an acrylic acid copolymer, a flexibilizer, tackifying resin and an isocyanate curing agent. The binder product comprises a binder layer formed by curing at least a part of the binder composition. The assembly is formed by bonding the binder layer. The binder can be used for firmly bonding various base materials, comprising both high surface energy base materials and low surface energy base materials; meanwhile, the binder can be pulled and removed from the base materials at a large angle. The binder is particularly suitable for the fields of smartphones, tablet computers and a newly developing electronic market.

Claims

1. A binder composition, comprising:

an acrylic acid copolymer, comprising a (methyl)acrylate monomer unit and a vinyl carboxylic acid comonomer unit;

a flexibilizer, comprising a functional group selected from a hydroxide radical, a carboxyl group and an amino group, wherein the flexibilizer has a non-polar carbon chain;

a tackifying resin, comprising a high-Tg tackifying resin with a Tg of at least 20°

C. and a low-Tg tackifying resin with a Tg of not more than 0°

C.; and

an isocyanate curing agent.

2. The binder composition according to claim 1, wherein a number average molecular weight Mn of the acrylic acid copolymer is lower than 500,000 g/mol and the Tg is lower than −

30°

C.

3. The binder composition according to claim 1, wherein the acrylic acid copolymer comprises the vinyl carboxylic acid copolymer unit in the amount ranging from 3 wt % to 8 wt %.

4. The binder composition according to claim 1, wherein the binder composition comprises the acrylic acid copolymer in the amount ranging from 20 wt % to 50 wt %.

5. The binder composition according to claim 1, wherein the non-polar carbon chain of the flexibilizer is derived from unsaturated alkene.

6. The binder composition according to claim 1, wherein the flexibilizer comprises the combination of hydroxy-terminated polybutadiene and SBS rubber.

7. The binder composition according to claim 6, wherein a hydroxyl content of the hydroxy-terminated polybutadiene is at least 1 mmol/g.

8. The binder composition according to claim 6, wherein a number average molecular weight Mn of the hydroxy-terminated polybutadiene is between 2300 g/mol and 4500 g/mol.

9. The binder composition according to claim 6, wherein the hydroxyl-terminated polybutadiene is present in an amount ranging from 20 wt % to 50 wt % based on the weight of the acrylic acid copolymer.

10. The binder composition according to claim 6, wherein the binder composition comprises the SBS rubber in an amount ranging from 5 wt % to 35 wt %.

11. The binder composition according to claim 1, wherein the binder composition comprises the flexibilizer in an amount of not more than 65 wt %.

12. The binder composition according to claim 11, wherein the binder composition comprises the flexibilizer in an amount ranging from 10 wt % to 65 wt %.

13. The binder composition according to claim 1, wherein the Tg of the high-Tg tackifying resin is at least 85°

C. and the Tg of the low-Tg tackifying resin is not more than −

20°

C.

14. The binder composition according to claim 1, wherein a weight ratio of the high-Tg tackifying resin to the low-Tg tackifying resin ranges from 1:

1 to 8;

1.

15. The binder composition according to claim 1, wherein a weight ratio of the high-Tg tackifying resin to the low-Tg tackifying resin ranges from 2:

1 to 4;

1.

16. The binder composition according to claim 1, wherein the binder composition comprises the tackifying resin in an amount ranging from 30 wt % to 45 wt %.

17. The binder composition according to claim 1, wherein the isocyanate curing agent is present in an amount ranging from more than 0 wt % to not more than 3 wt % based on the weight of the acrylic acid copolymer.

18. The binder composition according to claim 6, the isocyanate curing agent is present in an amount of at least 5 wt % based on the weight of the hydroxy-terminated polybutadiene.

19. The binder composition according to claim 1, comprising:

the acrylic acid copolymer in an amount ranging from 20 wt % to 50 wt %, the flexibilizer in an amount ranging from 10 wt % to 65 wt %, the tackifying resin in the amount ranging from 30 wt % to 45 wt %, and the isocyanate curing agent in the amount ranging from more than 0 wt % to not more than 3 wt % based on the weight of the acrylic acid copolymer.

20. A binder product, comprising a binder layer formed by curing at least a part of the binder composition in claim 1.

21. The binder product according to claim 20, further comprising:

a carrier, wherein the binder layer is disposed on at least one side of the carrier.

22. The binder product according to claim 21, wherein the carrier contains an elastomer with a non-polar carbon chain.

23. The binder product according to claim 22, wherein the elastomer is selected from SBS, SEPS, SIS and isocyanate-crosslinked hydroxy-terminated polybutadiene.

24. The binder product according to claim 20, wherein when a test is performed according to an initial viscosity test standard PSTC-6, a ratio of an initial viscosity of the binder product under a non-pulling state to an initial viscosity when the binder product is pulled to a strain of 300% is more than 3.

25. The binder product according to claim 20, wherein when a test is performed according to an initial viscosity test standard PSTC-6, a ratio of an initial viscosity of the binder product under a non-pulling state to an initial viscosity when the binder product is pulled to a strain of 300% is more than 5.

26. The binder product according to claim 24, wherein after being aged for 72 hours under the condition of 65°

C. and relative humidity of 95%, a test is performed according to an initial viscosity test standard PSTC-6, and a ratio of an initial viscosity of the binder product under a non-pulling state to an initial viscosity when the binder product is pulled to a strain of 300% is more than 2.4.

27. The binder product according to claim 25, wherein after being aged for 72 hours under the condition of 65°

C. and relative humidity of 95%, a test is performed according to an initial viscosity test standard PSTC-6, and a ratio of an initial viscosity of the binder product under a non-pulling state to an initial viscosity when the binder product is pulled to a strain of 300% is kept more than 5.

28. A method for preparing a binder product, comprising following steps:

providing the binder composition according to claim 1 positioned in a liquid medium, and obtaining a coating liquid;

coating the coating liquid on one side or two opposite sides of a carrier, and forming a coating; and

curing at least a part of the coating and forming a binder layer.

29. The method according to claim 28, wherein the liquid medium is selected from an organic inert solvent and the carrier comprises an elastomer with a non-polar carbon chain.

35. An assembly, comprising a first base material, a second base material and a binder layer for bonding the first base material and the second base material together, wherein the binder is formed by curing at least a part of the binder composition according to The adhesive tape according to claim 1.

36. The assembly according to claim 35, wherein, the first base material and the second base material are respectively independently selected from low surface energy base materials with a surface energy ranging from 20 dyne to 35 dyne and high surface energy base materials with a surface energy higher than 35 dyne.

37. The assembly according to claim 35, wherein the first base material and the second base material are respectively independently selected from metal, ceramic, polymer, glass and ink surface.

38. The assembly according to claim 35, wherein the binder layer can be removed from the first base material and/or the second base material by pulling.

30. An adhesive tape, comprising:

a carrier containing an elastomer, and

a binder layer disposed on one side or two opposing sides of the carrier, the binder layer is formed by the binder composition and the binder composition comprises;

an acrylic acid copolymer in an amount ranging from 20 wt % to 50 wt %, comprising a (methyl)acrylate monomer unit and a vinyl carboxylic acid comonomer unit in an amount ranging from 3 wt % to 8 wt %;

a flexibilizer in an amount ranging from 10 wt % to 65 wt %, comprising a combination of hydroxy-terminated polybutadiene and SBS rubber;

a tackifying resin in an amount ranging from 30 wt % to 45 wt %, comprising a high-Tg tackifying resin with a Tg of at least 20°

C. and a low-Tg tackifying resin with a Tg of not more than 0°

C., wherein a weight ratio of the high-Tg tackifying resin and the low-Tg tackifying resin ranges from 1;

1 to 1;

8; and

an isocyanate curing agent, wherein the isocyanate curing agent is present in an amount of not more than 3 wt % of the weight of the acrylic acid copolymer and in an amount that is least 5 wt % of the weight of the hydroxy-terminated polybutadiene.

31. The adhesive tape according to claim 30, wherein the acrylic copolymer has a number average molecular weight Mn lower than 500,000 g/mol and a Tg lower than −

30°

C.

32. The adhesive tape according to claim 30, wherein a hydroxyl content of the hydroxy-terminated polybutadiene is between 1 mmol/g to 1.5 mmol/g, number average molecular weight ranges from 2300 g/mol to 4500 g/mol, and the hydroxyl-terminated polybutadiene is present in an amount ranging from 20 wt % to 50 wt % based on the weight of the acrylic acid copolymer;

wherein the binder composition comprises the SBS rubber in an amount ranging from 5 wt % to 35 wt %.

33. The adhesive tape according to claim 30, wherein the Tg of the high-Tg tackifying resin is at least 85°

C. and the Tg of the low-Tg tackifying resin is not more than −

20°

C., and a weight ratio of the high-Tg tackifying resin to the low-Tg tackifying resin ranges from 2;

1 to 4;

1.

34. The adhesive tape according to claim 30, wherein the elastomer is selected from SBS, SEPS, SIS and isocyanate-crosslinked hydroxy-terminated polybutadiene.