Pressure sensitive adhesive composition and pressure sensitive adhesive sheet

Patent metadata

Field	Value
Publication number	US-9434861-B2
Application number	US-201214006497-A
Country	US
Kind code	B2
Filing date	Mar 21, 2012
Priority date	Mar 24, 2011
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

A pressure-sensitive adhesive composition containing a pressure-sensitive adhesive that contains from 40 to 95% by mass of a rubber-based resin not containing a styrene-derived constituent unit, and a photochromic dye of a dithienylethene-based compound, wherein the content of the photochromic dye is from 0.40 to 8.00 parts by mass relative to 100 parts by mass of the pressure-sensitive adhesive, and a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed of the pressure-sensitive adhesive composition have excellent weather resistance that can withstand long-term use, a relatively rapid rate of color change from colored to colorless, and excellent peelability to release sheets.

First claim

The invention claimed is:

1. A pressure-sensitive adhesive composition comprising a pressure-sensitive adhesive that comprises:
from 40 to 95% by mass of a rubber-based resin not comprising a styrene-derived constituent unit; and
a photochromic dye of a dithienylethene-based compound,
wherein a content of the photochromic dye is from 0.40 to 8.00 parts by mass relative to 100 parts by mass of the pressure-sensitive adhesive,
wherein the rubber-based resin comprises a polyisobutylene-based resin in which a content of the polyisobutylene-based resin is from 60 to 100% by mass in the rubber-based resin, and
wherein the rubber-based resin comprises a polyisobutylene-based resin having a weight average molecular weight of 300,000 to 500,000 as PIB-based resin (A) and a polyisobutylene-based resin having a weight average molecular weight of 1,000 to 280,000 as PIB-based resin (B).

2. The pressure-sensitive adhesive composition according to claim 1 , wherein the dithienylethene-based compound is a compound having two aryl groups, a hexafluorocyclopentene group, or both, in a structure of one molecule.

3. The pressure-sensitive adhesive composition according to claim 1 , wherein the pressure-sensitive adhesive further comprises a tackifier and a content of the tackifier is from 5 to 60% by mass in all components of the pressure-sensitive adhesive.

4. A pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed of the pressure-sensitive adhesive composition according to claim 1 .

5. The pressure-sensitive adhesive composition according to claim 1 , wherein the dithienylethene-based compound comprises two aryl groups and one or more hexafluorocyclopentene groups in the structure of one molecule.

6. The pressure-sensitive adhesive composition according to claim 1 , wherein the dithienylethene-based compound comprises two benzothienyl groups and one or more hexafluorocyclopentene groups in the structure of one molecule.

7. The pressure-sensitive adhesive composition according to claim 1 , wherein the rubber-based resin comprises a polyisobutylene-based resin in which a content of the polyisobutylene-based resin is from 95 to 100% by mass in the rubber-based resin.

8. The pressure-sensitive adhesive composition according to claim 1 , wherein the rubber-based resin comprises a polyisobutylene-based resin in which a content of the polyisobutylene-based resin is substantially 100% by mass in the rubber-based resin.

9. The pressure-sensitive adhesive composition according to claim 1 , wherein the content of the rubber-based resin is from 65 to 85% by mass relative to all the components of the pressure-sensitive adhesive composition.

10. The pressure-sensitive adhesive composition according to claim 1 , wherein the pressure-sensitive adhesive further comprises a tackifier in which a content of the tackifier is from 15 to 35% by mass relative to all the components of the pressure-sensitive adhesive composition.

11. The pressure-sensitive adhesive composition according to claim 3 , wherein the tackifier is a hydrogenated petroleum resin.

12. The pressure-sensitive adhesive composition according to claim 1 , wherein the content of PIB-based resin (B) is from 2 to 100 parts by mass relative to 100 parts by mass of PIB-based resin (A).

13. The pressure-sensitive adhesive sheet according to claim 4 , wherein the sheet is colorless or pale color after 75 hours irradiation with a light of a carbon arc lamp.

14. The pressure-sensitive adhesive sheet according to claim 4 , wherein the sheet discolors by 5 seconds irradiation with UV ray having a wavelength of 365 nm after 75 hours irradiation with a light of a carbon arc lamp.

Assignees

• Amino Yumiko
• Uemura Kazue
• Ono Yoshitomo
• Lintec Corp

Inventors

• Amino Yumiko
• Uemura Kazue
• Ono Yoshitomo

Classifications

• C09J123/22 Primary

  Copolymers of isobutene; Butyl rubber {; Homo- or copolymers of other iso-olefines} · CPC title

• C08K5/0041

  Optical brightening agents, organic pigments · CPC title

• C09J123/283 Primary

  Halogenated homo- or copolymers of iso-olefines · CPC title

• C08K5/45

  Heterocyclic compounds having sulfur in the ring · CPC title

• C09J9/00

  Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks (C09J7/00 takes precedence) · CPC title