Adhesive composition and method for producing the same, adhesive layer, and adhesive sheet

JP7863450B2Active Publication Date: 2026-05-21NIPPON CARBIDE KOGYO KK
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
NIPPON CARBIDE KOGYO KK
Filing Date
2022-05-06
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Water-based adhesives used in building materials face issues with poor water resistance, swelling, whitening, and peeling under humid and hot conditions, particularly in wet areas like bathrooms and kitchens, due to inadequate cohesive strength perpendicular to the bonding surface.

Method used

An adhesive composition comprising (meth)acrylic resin particles with specific constituent units derived from alkyl (meth)acrylate monomer, (meth)acrylonitrile, (meth)acrylic monomer with a carboxyl group, and reactive surfactant, along with a crosslinking agent, forming an adhesive layer with controlled particle size and surfactant content for enhanced adhesion and water resistance.

Benefits of technology

The adhesive composition achieves high adhesive strength, excellent water resistance, and the ability to withstand loads perpendicular to the adhesive surface even in humid and hot environments, addressing the limitations of traditional water-based adhesives.

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Patent Text Reader

Abstract

To provide an adhesive composition or the like capable of forming an adhesive layer which has high adhesive strength even in a humid heat environment, has excellent water resistance and can withstand a load in a perpendicular direction to the adhered surface.SOLUTION: There is provided an adhesive composition which comprises a constituent unit (A) derived from a (meth)acrylic acid alkyl ester monomer (A), a constituent unit derived from (meth)acrylonitrile (B), a constituent unit derived from a (meth)acrylic monomer having a carboxy group (C) and a constituent unit derived from a reactive surfactant (D) and further comprises (meth)acrylic resin particles having an average particle diameter of 5 to 160 nm and water, wherein the content ratio of the constituent unit (B) is 10 to 25 mass% based on the total constituent units [provided that the constituent unit (D) is excluded], the content ratio of the constituent unit (C) is 0.2 to 6.0 mass% based on the total constituent units [provided that the constituent unit (D) is excluded] and the content of the constituent unit (D) is 0.1 to 1.0 mass% based on 100 pts.mass of the total constituent units [provided that the constituent unit (D) is excluded] .SELECTED DRAWING: None
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