Adhesive composition, adhesive layer and adhesive sheet

Patent metadata

Field	Value
Publication number	US-11560499-B2
Application number	US-201716465475-A
Country	US
Kind code	B2
Filing date	Nov 29, 2017
Priority date	Nov 30, 2016
Publication date	Jan 24, 2023
Grant date	Jan 24, 2023

Abstract

The present invention relates to an adhesive composition containing a base polymer and a moisture-curable component, wherein the base polymer contains a polymer having no functional group which reacts with the moisture-curable component, and a water content of the base polymer after storage at 25° C. and 50% RH for 24 hours is 0.1% by weight or less, and wherein the moisture-curable component is contained in an unreacted state, an adhesive layer made from the adhesive composition, and an adhesive sheet including the adhesive layer.

First claim

The invention claimed is:

1. An adhesive composition comprising:
a base polymer comprising an acrylic polymer;
a water-absorbing polymer; and
a moisture-curable component,

wherein
the base polymer contains a polymer having no functional group which reacts with the moisture-curable component,
a water content of the base polymer after storage at 25° C. and 50% RH for 24 hours is 0.1% by weight or less,
a content of the moisture-curable component is 3.7% and 30% by weight based on all the components of the adhesive composition excluding a solvent,
a content of the water-absorbing polymer is 3.6% to 30% by weight based on all the components of the adhesive composition excluding a solvent,
the content of the moisture-curable component is less than or equal to the content of the water-absorbing polymer, and
the moisture-curable component is contained in an unreacted state.

2. The adhesive composition according to claim 1 , wherein the base polymer has a moisture permeability at 40° C. and 90% RH of 25 g/m 2 ·24 hr or less when forming a layer having a thickness of 100 μm.

3. The adhesive composition according to claim 1 , wherein the moisture-curable component is capable of chemically bonding to an adherend.

4. The adhesive composition according to claim 1 , wherein the moisture-curable component is an aliphatic isocyanate or an alicyclic isocyanate.

5. An adhesive layer comprising the adhesive composition according to claim 1 .

6. An adhesive sheet comprising the adhesive layer according to claim 5 .

7. The adhesive sheet according to claim 6 , wherein the adhesive layer is formed on a substrate.

Assignees

• Nitto Denko Corp

Inventors

• Kira Yoshiko
• Tani Kensuke
• Asai Ryoko
• Shimokawa Kayo
• Okada Kenichi

Classifications

• C09J133/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C09J11/08

  Macromolecular additives · CPC title

• C09J7/32

  Water-activated {adhesive}, e.g. for gummed paper · CPC title

• C09J153/02 Primary

  Vinyl aromatic monomers and conjugated dienes · CPC title

• C09J2423/00

  Presence of polyolefin · CPC title