IP Library › Granted Patent US 12686799
Granted Patent B2
US 12686799 · App. 17/865,844 · Granted Jul 21, 2026

Water-dispersed pressure-sensitive adhesive composition

Inventors: Hayata Matsumoto (Osaka, JP); Keisuke Shimokita (Osaka, JP); Shuhei Yamamoto (Osaka, JP); Amane Sawamura (Osaka, JP)
Assignee: NITTO DENKO CORPORATION
C09J133/08C09J133/064C09J2301/312
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Quick Facts
Patent No.
US 12686799
App. No.
17/865,844
Granted
Jul 21, 2026
Kind
B2
Abstract

A water-dispersed pressure-sensitive adhesive composition includes a water-dispersible polymer and water. The viscosity X (Pa·s) and the dynamic surface tension Y (mN/m) at a life time of 100 milliseconds satisfy the following formulas (1) and (2): 0.15≤ X ≤1.25  (1) Y≤ 19.3 X +35  (2)

Claims (24)

1 . A water-dispersed pressure-sensitive adhesive composition comprising:

a water-dispersible polymer, a leveling agent, a thickener, and water, wherein

the viscosity X (Pa·s) and the dynamic surface tension Y (mN/m) at a life time of 100 milliseconds satisfy the following formulas (1) and (2):

0.15≤ X≤ 1.25  (1)

Y≤ 19.3 X+ 35  (2), and

wherein a solid content concentration of the water-dispersed pressure-sensitive adhesive composition is 10% by mass or more and 40% by mass or less, and

a content of the thickener is 3 parts by mass or more with respect to 100 parts by mass of the water-dispersible polymer.

2 . The water-dispersed pressure-sensitive adhesive composition according to claim 1 further satisfying the following formula (3):

Y≤− 5.28 X 2 +17.3 X+ 36  (3)

3 . The water-dispersed pressure-sensitive adhesive composition according to claim 2 further satisfying the following formula (4):

Y≥ 20  (4)

4 . The water-dispersed pressure-sensitive adhesive composition according to claim 3 further satisfying the following formula (5):

X≤ 1.0  (5)

5 . The water-dispersed pressure-sensitive adhesive composition according to claim 4 further satisfying the following formula (6):

0.4 ≤X   (6)

6 . The water-dispersed pressure-sensitive adhesive composition according to claim 1 , wherein

the water-dispersible polymer is a water-dispersible acrylic polymer, and

the water-dispersible acrylic polymer is a polymer of a monomer component containing 70% by mass or more and 99.5% by mass or less of alkyl (meth)acrylate, 0.1% by mass or more and 10% by mass or less of a carboxy group-containing monomer, and 0% by mass or more and 29.9% by mass or less of a functional group-containing vinyl monomer.

7 . The water-dispersed pressure-sensitive adhesive composition according to claim 6 , wherein the carboxy group-containing monomer is acrylic acid and/or methacrylic acid.

8 . The water-dispersed pressure-sensitive adhesive composition according to claim 1 , wherein the leveling agent includes sodium dialkylsulfosuccinate.

9 . The water-dispersed pressure-sensitive adhesive composition according to claim 8 , wherein the sodium dialkylsulfosuccinate has 6 or more and 12 or less carbon atoms.

10 . The water-dispersed pressure-sensitive adhesive composition according to claim 1 , wherein the leveling agent content is 0.5 parts by mass or more and below 5 parts by mass with respect to 100 parts by mass of the water-dispersible polymer.

11 . The water-dispersed pressure-sensitive adhesive composition according to claim 1 , wherein the thickener includes polyacrylic acid or a carboxylic acid-based copolymer.

12 . The water-dispersed pressure-sensitive adhesive composition according to claim 1 , wherein the thickener content is 3 parts by mass or more and below 8 parts by mass with respect to 100 parts by mass of the water-dispersible polymer.