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Pressure-sensitive adhesive sheet

a technology of adhesive sheets and adhesive sheets, applied in the direction of film/foil adhesives, synthetic resin layered products, protective garments, etc., can solve the problems of increasing the adhesive strength of aged sheets, increasing the age of adhesive sheets, so as to prevent corrosion of metal sheets and good removability

Pending Publication Date: 2022-03-31
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a PSA sheet that can be used to protect metal surfaces from contamination and corrosion. The sheet is made up of a base polymer that maintains good removability even after being adhered to the metal surface for a long period. The sheet also includes a small amount of rust inhibitor to prevent corrosion. After the protection period, the metal surface can be coated or processed in other ways without leaving any defects. Overall, the PSA sheet provides effective protection against contamination and corrosion while still being easy to remove.

Problems solved by technology

However, when used in an embodiment involving prolonged protection by the PSA sheet, the adhesive strength may increase due to changes in temperature, etc., and the intended removability may not be maintained.
As a solution, an adhesive strength adjuster may be added to reduce the increase in aged adhesive strength; however, the adhesive strength adjuster may contaminate the adherend surface.

Method used

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  • Pressure-sensitive adhesive sheet
  • Pressure-sensitive adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0229]Were mixed a starting monomer mixture comprising 58 parts of 2-ethylhexyl acrylate, 40 parts of n-butyl methacrylate and 2 parts of acrylic acid with 3 parts of surfactant (trade name AQUALON KH-1025 available from Dai-ichi Kogyo Seiyaku Co., Ltd.; ammonium polyoxyethylene-1-(allyloxymethyl) alkyl ether sulfate with up to 30 moles of added EO) and 150 parts of polymerization water. The resulting mixture was emulsified under nitrogen flow with an emulsifying machine (homo mixer) to prepare an emulsion of the starting monomers.

[0230]Into a reaction vessel equipped with a thermometer, nitrogen inlet, condenser and stirrer, was placed the emulsion and heated under nitrogen flow to a liquid temperature of 50° C. while stirring. To this, was added 0.03 part of 2,2′-azobis(2-methylpropionamidine)dihydrochloride (product name V-50 available from Wako Pure Chemical industries, Ltd.) as polymerization initiator and the polymerization reaction was carried out for 5 hours while maintainin...

examples 2 to 5

[0233]Rust inhibitor A was used in the amounts show in Table 1. Otherwise in the same manner as Example 1, were obtained PSA sheets according to the respective Examples.

examples 6 to 7

[0234]Rust inhibitor A was changed to rust inhibitor B (product name CHELESLITE W-16B available from Chelest Corporation, containing organic acid salt and rust inhibitor for iron) or to rust inhibitor C (product name THIOLITE C-560R13 available from Chiyoda Chemical Co., Ltd., 50-60% triethanolamine). Otherwise in the same manner as Example 3, were obtained PSA sheets according to the respective Examples.

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Abstract

Provided is a PSA sheet that can be used on a metal adherend because it has anti-metal-corrosive properties and can also maintain good removability while preventing or inhibiting adherend surface contamination even when prolongedly adhered to the adherend. A PSA sheet having a PSA layer is provided. The PSA layer comprises at least 95% base polymer by weight and has a chloride ion amount of less than 300 μg per gram of pressure-sensitive adhesive layer, determined by hot water extraction.

Description

TECHNICAL FIELD[0001]The present invention relates to a pressure-sensitive adhesive sheet.[0002]The present application claims priority to Japanese Patent Applications No. 2018-246231, No. 2018-246232 each filed on Dec. 27, 2018 and No. 2019-118312 filed on Jun. 26, 2019; the entire content thereof is incorporated herein by reference.BACKGROUND ART[0003]In general, pressure-sensitive adhesive (PSA) exists as a soft solid (a viscoelastic material) in a room temperature range and has a property to adhere easily to an adherend with some pressure applied. For such a property, in processing and transporting various articles, PSA has been widely used as PSA sheets for various purposes, including surface protective sheets to prevent damage (scratches, contamination, corrosion, etc.) of their surfaces. For instance, a PSA sheet having a PSA layer on one face of a substrate is preferably used as a surface protective sheet to protect metal plate surface. Conventional art documents disclosing ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09J7/38C08F220/18C08F220/06C08K5/17C08K5/353
CPCC09J7/385C08F220/1808C08F220/1804C08F220/06C08K5/17C09J2301/408C09J2301/302C09J2400/163C09J2301/12C09J2433/00C08K5/353C09J7/38C09J2421/00C09J2301/122C08K5/0025C08K5/005C09J133/08C08L2205/03B32B2307/748B32B23/046B32B27/16B32B27/308B32B27/306B32B27/18B32B27/34B32B25/08B32B23/048B32B5/18B32B2274/00B32B27/302B32B2266/0207B32B23/08B32B25/06B32B27/32B32B2270/00B32B27/281B32B27/22B32B27/40B32B25/045B32B27/365B32B23/06B32B27/36B32B25/18B32B27/10B32B29/007B32B25/042B32B27/065B32B2266/0278B32B25/12B32B27/304B32B2571/00B32B2250/24B32B27/20B32B27/08C08L33/062C08L71/02C09J7/243C09J2203/37C09J2301/502C09J2301/414B32B17/10B32B2250/02B32B2255/205B32B2315/08B32B2333/08B32B2419/00C03C23/0075C09J2423/046
Inventor SHIMAZAKI, YUTAYONEZAKI, KOSUKEHORIGUCHI, HAKARU
Owner NITTO DENKO CORP
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