Pressure-sensitive adhesive composition and pressure-sensitive adhesive tape

Patent metadata

Field	Value
Publication number	US-9909036-B2
Application number	US-201615298022-A
Country	US
Kind code	B2
Filing date	Oct 19, 2016
Priority date	Jun 2, 2008
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A pressure-sensitive adhesive composition is disclosed. The composition comprises a particulate polymer of a monomer mixture comprising (a) an alkyl (meth)acrylate monomer; (b) at least one of (b-1) an alkyl (meth)acrylate monomer with the alkyl group having a carbon number of 15 to 24 and the alkyl group being a linear alkyl group and (b-2) an alkyl (meth)acrylate monomer with the alkyl group having a carbon number of 15 to 24 and the alkyl group being a branched alkyl group; and (c) a monoolefinically unsaturated monomer having a ketone group with the alkyl group having a carbon number of 8 to 14. Pressure sensitive adhesive tapes incorporating such adhesive compositions are also described.

First claim

What is claimed is:

1. A pressure-sensitive adhesive composition comprising (A) a particulate polymer of a monomer mixture comprising:
from 20 to 55 mass % of (a) an alkyl (meth)acrylate monomer with an alkyl group having a carbon number of 8 to 14,
from 20 to 35 mass % of (b-1) an alkyl (meth)acrylate monomer with an alkyl group having a carbon number of 15 to 24 wherein the alkyl group is a linear alkyl group,
from 5 to 35 mass % of (b-2) an alkyl (meth)acrylate monomer with an alkyl group having a carbon number of 15 to 24 wherein the alkyl group is a branched alkyl group, and
from 2 to 5 mass % of (c) a monoolefinically unsaturated monomer having a ketone group,
said percentages each being based on the total amount of the monomers (a), (b-1), (b-2), and (c),
wherein the monomer mixture is polymerized in the presence of water; and
(B) an initiator having low solubility in water.

2. The pressure-sensitive adhesive composition of claim 1 wherein monomer (a) is selected from the group consisting of 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, isononyl (meth)acrylate, isodecyl (meth)acrylate and isobornyl (meth)acrylate.

3. The pressure-sensitive adhesive composition of claim 1 wherein monomer (b-1) is selected from the group consisting of cetyl (meth)acrylate and stearyl (meth)acrylate.

4. The pressure-sensitive adhesive composition of claim 1 wherein monomer (b-2) is selected from the group consisting of alkyl (meth)acrylate monomer with the alkyl group having a carbon number of 16 or 18.

5. The pressure-sensitive adhesive composition of claim 1 wherein monomer (c) is selected from the group consisting of diacetone (meth)acrylamide, acryloylbenzophenone, vinyl methyl ketone, vinyl ethyl ketone and vinyl isobutyl ketone.

6. The pressure-sensitive adhesive composition of claim 5 wherein monomer (c) is diacetone (meth)acrylamide.

7. The pressure-sensitive adhesive composition of claim 1 wherein the particle polymer of a monomer mixture (A) further comprises 0.1 to 0.5 mass % of an internal crosslinking agent based on the total mass of the monomers (a), (b-1), (b-2), (c) and the internal crosslinking agent.

8. The pressure-sensitive adhesive composition of claim 7 wherein the internal crosslinking agent is a (meth)acrylic acid ester of diol.

9. The pressure-sensitive adhesive composition of claim 1 wherein the particle polymer of a monomer mixture (A) further comprises an external crosslinking agent.

10. The pressure-sensitive adhesive composition of claim 1 wherein the particle polymer of a monomer mixture (A) further comprises 0.1 to 0.5 mass % of an internal crosslinking agent, wherein the percentage of the internal crosslinking agent is based on the total mass of the monomers (a), (b-1), (b-2), (c), and the internal crosslinking agent; and an external crosslinking agent.

11. A layer of the pressure-sensitive adhesive composition of claim 1 wherein a thickness of the adhesive layer ranges from 3 μm to 150 μm.

Assignees

• 3M Innovative Properties Co

Inventors

• Fujita Jun
• Takamatsu Yorinobu
• Kojima Sawako

Classifications

• C09J7/38 Primary

  Pressure-sensitive adhesives [PSA] · CPC title

• C08F220/58

  containing oxygen in addition to the carbonamido oxygen {, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine} · CPC title

• C08J2333/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09J2400/283

  in the substrate · 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