Adhesive Sheet Urethane Polymer Anchoring

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Adhesive sheets often experience separation between the substrate and adhesive layer during unwinding or peeling, leading to stickiness issues, which existing technologies fail to fully resolve while maintaining anchoring performance.

Innovation Solution

An adhesive sheet comprising a substrate with a urethane polymer component and a silicone adhesive layer, where the urethane polymer has a chain extender-derived hard segment and a polyoxyalkylene polyol-derived soft segment, enhancing anchoring performance without causing stickiness, even when unwinding or re-peeling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a silicone adhesive layer is applied directly to a substrate, then the adhesive sheet can be easily manufactured, but separation occurs between the substrate and adhesive layer during unwinding or peeling

Engineering Contradiction:

Improveease of manufactureVSAvoidanchoring performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent introduces a urethane polymer component as an intermediary layer between the silicone adhesive layer and the substrate. This intermediate layer prevents direct contact between the adhesive and substrate, eliminating the separation issue while maintaining manufacturing simplicity. The urethane polymer acts as a mediator that ensures reliable anchoring performance during unwinding and peeling operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite structure consisting of multiple materials: a substrate, a urethane polymer component layer, and a silicone adhesive layer. This composite material approach combines the advantages of each material - the substrate provides structural support, the urethane polymer provides anchoring functionality, and the silicone adhesive provides bonding capability - to achieve both ease of manufacture and high reliability.

Inventive Principle:

Principle #40Composite materials

2Reliability

If primers are used to improve anchoring performance, then adhesion is enhanced, but stickiness occurs on the adhesive surface

Engineering Contradiction:

Improveanchoring performanceVSAvoidstickiness

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The urethane polymer component serves as an intermediary that provides anchoring performance without causing stickiness. Unlike primers that directly coat the substrate and create sticky surfaces, the urethane polymer layer maintains a non-sticky adhesive surface while ensuring reliable anchoring through its molecular structure with hard and soft segments.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the chemical and physical parameters of the anchoring interface by using a urethane polymer with specific molecular weight ratios of hard segments (30-70%) and soft segments (30-70%). This parameter optimization provides sufficient anchoring strength without the harmful stickiness effect observed with traditional primers.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the adhesive layer is made thicker to prevent separation, then anchoring performance improves, but the adhesive sheet becomes harder to handle and apply

Engineering Contradiction:

Improveanchoring performanceVSAvoidease of operation

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent segments the anchoring function from the adhesive function by creating a separate urethane polymer component layer with thickness of 0.01-10 μm, distinct from the silicone adhesive layer. This segmentation allows each layer to be optimized independently - the urethane layer provides anchoring without adding excessive thickness, while the silicone layer maintains proper adhesive properties for easy handling and application.

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The adhesive sheet achieves excellent adherence and prevents separation between the substrate and adhesive layer, eliminating stickiness issues while maintaining high anchoring performance, making it suitable for various applications including use on skin or fabrics.

Implementation Method 1

a urethane polymer component which is present at least at a portion of a surface of the substrate; and a silicone adhesive layer which is laminated so as to contact the urethane polymer component

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

The adhesive sheet exhibits excellent adherence, or in other words, high anchoring performance (anchor effect) between the silicone adhesive and the substrate

Methodology Applied

Scientific EffectMechanical interlocking:

Implementation Method 3

the urethane polymer having a chain extender-derived hard segment and a polyoxyalkylene polyol-derived soft segment

Methodology Applied

Scientific EffectPolymerization:

Data Source

PatentUS11795349B2Adhesive sheet

Publication Date: 2023.10.24 SOLVENTUM INTELLECTUAL PROPERTIES CO

AI summary

The disclosed adhesive sheet exhibits high anchoring performance and where separation between the substrate and the adhesive layer substantially does not occur when unwinding or re-peeling in actual applications. The adhesive sheet comprises a substrate including a urethane polymer component at least at a portion of a surface and a silicone adhesive layer that is in contact with the urethane polymer component, wherein the urethane polymer having a chain extender-derived hard segment and a polyoxyalkylene polyol-derived soft segment.