Multi-base material adaptivity pulling removal type binder product, binder composition and assembly

• US 10,167,357 B2
• Filed: 12/21/2015
• Issued: 01/01/2019
• 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
• Primary Examiner(s): Nguyen, Vu A
• Application Number:
  US15/520,907
• Publication Number:
  US 20170335038A1
• Time in Patent Office: 1,107 Days
• Field of Search: None
• 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 compositon 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, wherein the flexibilizer comprises the combination of hydroxy-terminated polybutadiene and SBS rubber;

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 comonomer 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 a hydroxyl content of the hydroxy-terminated polybutadiene is at least 1 mmol/g.

6. The binder composition according to claim 1, wherein a number average molecular weight Mn of the hydroxy-terminated polybutadiene is between 2300 g/mol and 4500 g/mol.

7. The binder composition according to claim 1, 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.

8. The binder composition according to claim 1, wherein the binder composition comprises the SBS rubber in an amount ranging from 5 wt % to 35 wt %.

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

10. The binder composition according to claim 9, wherein the binder composition comprises the flexibilizer in an amount ranging from 10 wt % to 65 wt %.

11. 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.

12. 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.

13. 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.

14. 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 %.

15. 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.

16. The binder composition according to claim 1, wherein the isocyanate curing agent is present in an amount of at least 5 wt % based on the weight of the hydroxy-terminated polybutadiene.