Protection sheet for vehicle window plate

Patent metadata

Field	Value
Publication number	US-2016137883-A1
Application number	US-201414902931-A
Country	US
Kind code	A1
Filing date	Jun 6, 2014
Priority date	Jul 8, 2013
Publication date	May 19, 2016
Grant date	—

Abstract

A protection sheet is provided for application to a vehicle window plate to protect the window plate. Protection sheet includes a substrate and a PSA layer provided on one surface of substrate. Protection sheet has a 30-minute peel strength (S1) of less than 0.10 N/20 mm and a 48-hour peel strength (S2) of 0.05 N/20 mm or greater when applied to a glass plate by a wet application method where water is provided to the surface of the glass plate and protection sheet is press-bonded to the glass plate while pushing the water present between the glass plate surface and PSA layer to the outside of the bonding area.

First claim

1 . A vehicle window plate protection sheet which is applied to a window plate of a vehicle to protect the window plate, comprising a substrate and a pressure-sensitive adhesive layer provided to one face of the substrate and satisfying the following conditions:
(A) having a 30-minute peel strength (S1) of less than 0.10 N/20 mm when the protection sheet is applied to a glass plate by a wet application method where water is provided to the surface of the glass plate and the protection sheet is press-bonded to the glass plate while pushing the water present between the glass plate surface and the pressure-sensitive adhesive layer to the outside of the bonding area; and (B) having a 48-hour peel strength (S2) of 0.05 N/20 mm or greater when applied to the glass plate by the wet application method.

2 . The vehicle window plate protection sheet according to claim 1 , wherein the pressure-sensitive adhesive layer comprises an acrylic polymer as its base polymer.

3 . The vehicle window plate protection sheet according to claim 1 , wherein the pressure-sensitive adhesive layer is formed with a solvent-based pressure-sensitive adhesive composition.

4 . The vehicle window plate protection sheet according to claim 1 , wherein
the pressure-sensitive adhesive layer comprises a base polymer and an application aider, and the application aider content is 10 parts by weight or less to 100 parts by weight of the base polymer.

5 . The vehicle window plate protection sheet according to claim 4 , wherein the application aider comprises one, two or more species selected among anionic surfactants, nonionic surfactants and hydrophilic polymers.

6 . The vehicle window plate protection sheet according to claim 1 , wherein
the pressure-sensitive adhesive layer has a thickness TA of 1 μm or larger, the substrate has a thickness TB of 20 μm or larger, but 300 μm or smaller, and the thickness TA of the pressure-sensitive adhesive layer is at least 3% of the combined thickness (TA+TB) of the pressure-sensitive adhesive layer thickness TA and the substrate thickness TB.

Assignees

• Nitto Denko Corp

Inventors

• Igarashi Takeshi
• Suzuki Toshitaka
• Wakayama Nao

Classifications

• C09J7/0217 Primary

  Chemistry & Metallurgy · mapped topic

• C09J2201/606

  Chemistry & Metallurgy · mapped topic

• C09J2201/122

  Chemistry & Metallurgy · mapped topic

• C09J2433/00

  Presence of (meth)acrylic polymer · CPC title

• B32B2571/00

  Protective equipment · CPC title