Matte Multilayer Adhesive Tape Structure for Strong Overlap Bonding

Solution Overview

Problem

Existing matte adhesive tapes exhibit decreased adhesive strength when applied in an overlapping manner due to their matte surface structure, compromising adhesion to backing.

Innovation Solution

A multilayer body with a support layer and a surface resin layer featuring an uneven structure with a maximum height (Rz) of 7.0 μm or more, which includes a colored pigment and an olefin polymer, and is manufactured using an embossing process to achieve a matte property and enhanced adhesion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a matte layer or matte printed layer is provided on the surface of the adhesive tape to achieve a matte property, then the glossiness is reduced, but the adhesive strength decreases

Engineering Contradiction:

ImproveglossinessVSAvoidadhesive strength

Core Design Contradiction:

Illumination intensityVSStrength

Solution Approach 1:

The invention applies local quality by creating an uneven structure only on the surface resin layer while keeping the adhesive agent layer smooth and adhesive. The surface resin layer has an uneven structure with specific Rz values to achieve matte property, while the adhesive agent layer maintains its adhesive functionality without being affected by the surface unevenness.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention segments the adhesive tape into distinct functional layers: a support layer, an adhesive agent layer, and a surface resin layer. This segmentation allows each layer to independently perform its function - the adhesive agent layer provides adhesion while the surface resin layer provides the matte appearance, resolving the contradiction between matte property and adhesive strength.

Inventive Principle:

Principle #1Segmentation

2Illumination intensity

If the surface of the adhesive tape is made matte to suppress reflected light, then the matte property is improved, but the adhesion to backing deteriorates

Engineering Contradiction:

Improvereflected lightVSAvoidadhesion to backing

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The invention applies local quality by creating an uneven structure only on the surface resin layer while keeping the adhesive agent layer smooth and adhesive. The surface resin layer has an uneven structure with specific Rz values to achieve matte property, while the adhesive agent layer maintains its adhesive functionality without being affected by the surface unevenness.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention resolves the contradiction by adding a third dimension - the surface resin layer is positioned above the adhesive agent layer, separating the matte property function from the adhesion function. This dimensional separation allows the uneven surface structure to affect light reflection without interfering with the adhesive contact with the backing.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS20260054472A1Multilayer body and adhesive tape including the multilayer body

Publication Date: 2026.02.26 DIATEX CO LTD

AI summary

A multilayer body that can achieve an adhesive tape with a matte property and excellent designability, and also excellent adhesion to backing is provided. The multilayer body includes a support layer, and a surface resin layer provided on one primary surface side of the support layer, in which the surface resin layer has an uneven structure in which an exposed face on a side opposite to the support layer has a maximum height (Rz) of 7.0 μm or more.