Method for producing glass unit, pressure-sensitive adhesive sheet, and use of corrosion inhibitor

Patent metadata

Field	Value
Publication number	US-10583630-B2
Application number	US-201815946189-A
Country	US
Kind code	B2
Filing date	Apr 5, 2018
Priority date	Dec 28, 2017
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

Provided is a method for producing a glass unit. The method comprises a step (A) of obtaining a glass plate comprising a glass substrate and a Low-E layer placed on the glass substrate; a step (B) of applying a protective sheet to the Low-E layer surface of the glass plate; an optional step (C) of subjecting the glass plate to at least one process selected from the group consisting of transportation, storage, processing, washing and handling; a step (D) of removing the protective sheet from the glass plate; and a step (E) of assembling a glass unit using the glass plate. The protective sheet comprises a substrate layer, and a PSA layer provided to at least one face of the substrate layer. The PSA layer comprises, as a corrosion inhibitor, a surfactant free of sulfur atoms.

First claim

What is claimed is:

1. A method for producing a glass unit, the method comprising:
a step (A) of obtaining a glass plate comprising a glass substrate and a low-emissivity layer placed on the glass substrate;
a step (B) of applying a protective sheet to the low-emissivity layer surface of the glass plate;
a step (C) of subjecting the glass plate with the protective sheet applied thereon to at least one process selected from the group consisting of transportation, storage, processing, washing and handling;
a step (D) of removing the protective sheet from the glass plate; and
a step (E) of assembling a glass unit using the glass plate;
wherein, the protective sheet comprises a substrate layer and a pressure-sensitive adhesive layer on at least one surface of the substrate layer, and
the pressure-sensitive adhesive layer comprises, as a corrosion inhibitor, a surfactant free of sulfur atoms.

2. The method according to according to claim 1 , wherein the low-emissivity layer includes a silver layer.

3. The method according to according to claim 1 , wherein the low-emissivity layer has a thickness of 1000 nm or less.

4. The method according to according to claim 1 , wherein the step (B) includes covering an entire surface of the glass plate with at least one of the protective sheet.

5. The method according to claim 1 , wherein the pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive layer comprising an acrylic polymer as a base polymer or a rubber-based pressure-sensitive adhesive layer comprising a rubber-based polymer as a base polymer.

6. The method according to claim 1 , wherein the pressure-sensitive adhesive layer is formed from a water-dispersed pressure-sensitive adhesive composition.

7. The method according to claim 1 , wherein the pressure-sensitive adhesive layer comprises an acrylic polymer as a base polymer, the acrylic polymer being crosslinked by a crosslinking agent and the crosslinking agent being at least one species selected from the group consisting of an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, an oxazoline-based crosslinking agent and an aziridine-based crosslinking agent.

8. The method according to claim 1 , wherein the pressure-sensitive adhesive layer has a surface hardness of 0.2 MPa or greater.

9. A pressure-sensitive adhesive sheet comprising a substrate layer and a pressure-sensitive adhesive layer on at least a surface of the substrate layer,
wherein the pressure-sensitive adhesive layer comprises an acrylic polymer as a base polymer or a rubber-based polymer as a base polymer, and, as a corrosion inhibitor, a surfactant free of sulfur atoms, and
the pressure-sensitive adhesive layer has a surface hardness of 0.2 MPa or greater.

10. The pressure-sensitive adhesive sheet according to claim 9 , wherein the corrosion inhibitor is an anionic surfactant or a nonionic surfactant.

11. The pressure-sensitive adhesive sheet according to claim 9 , wherein the corrosion inhibitor is a phosphate represented by a formula (a):

(in the formula (a), R 1 is —OH or —(OCH 2 CH 2 ) n OR 3 ; R 2 represents —(OCH 2 CH 2 ) m OR 4 ; n and m are identical or different and each is an integer between 1 and 30; R 3 and R 4 are identical or different and each is an organic group with 1 to 30 carbon atoms).

12. The pressure-sensitive adhesive sheet according to claim 9 , wherein the corrosion inhibitor content in the pressure-sensitive adhesive layer is 0.05 part to 10 parts by weight to 100 parts by weight of a base polymer in the pressure-sensitive adhesive layer.

13. The pressure-sensitive adhesive sheet according to claim 9 , wherein the pressure-sensitive adhesive layer has a surface hardness of 0.3 MPa or greater.

14. The pressure-sensitive adhesive sheet according to claim 9 , wherein the pressure-sensitive adhesive layer has a surface hardness of 0.5 MPa or less.

15. The pressure-sensitive adhesive sheet according to claim 9 , wherein the pressure-sensitive adhesive layer is formed from a water-dispersed pressure-sensitive adhesive composition, a solvent-based pressure-sensitive adhesive composition or a hot-melt pressure-sensitive adhesive composition.

16. The pressure-sensitive adhesive sheet according to claim 9 , wherein the pressure-sensitive adhesive layer is formed from a water-dispersed pressure-sensitive adhesive composition.

17. The pressure-sensitive adhesive sheet according to claim 9 , wherein the pressure-sensitive adhesive layer has a thickness of 15 μm or less.

18. The pressure-sensitive adhesive sheet according to claim 9 , wherein the pressure-sensitive adhesive layer comprises an acrylic polymer as a base polymer, the acrylic polymer being crosslinked by a crosslinking agent and the crosslinking agent being at least one species selected from the group consisting of an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, an oxazoline-based crosslinking agent and an aziridine-based crosslinking agent.

19. The pressure-sensitive adhesive sheet according to claim 9 , wherein the corrosion inhibitor is a phosphate represented by a formula (a):

in the formula (a), R 1 is —OH or —(OCH 2 CH 2 ) n OR 3 ; R 2 represents —(OCH 2 CH 2 ) m OR 4 ; n and m are identical or different and each is an integer between 1 and 30; R 3 and R 4 are identical or different and each is a linear or branched alkyl group).

Assignees

• Nitto Denko Corp
• Nitto Belgium Nv

Inventors

• Yonezaki Kousuke
• Horiguchi Hakaru
• Gruyters Peter
• Pinxten Donald

Classifications

• C08K5/005

  Stabilisers against oxidation, heat, light, ozone · CPC title

• B65G49/069

  Means for avoiding damage to stacked plate glass, e.g. by interposing paper or powder spacers in the stack (maculation per se B65H39/00) · CPC title

• C09J2433/00

  Presence of (meth)acrylic polymer · CPC title

• C09J7/385

  Acrylic polymers · CPC title

• B32B17/06

  comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} · CPC title