Silicone Pressure Sensitive Adhesive for Selective Substrate Bonding

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In the manufacturing and use of display devices, such as OLED and LCD devices, there is a need for a protective carrier tape that can securely attach urethane foam without being handled independently, as existing solutions like urethane foam are soft and thin, and conventional adhesives lack selective adhesion to different substrates.

Innovation Solution

A pressure sensitive adhesive composition comprising bis-alkenyl-terminated polydiorganosiloxane, polyorganosilicate resin, polyorganohydrogensiloxane, a hydrosilylation reaction catalyst, a hydrosilylation reaction inhibitor, and an organic solvent, which cures via hydrosilylation reaction to provide selective adhesion to substrates, enabling the formation of a carrier tape for protecting display devices during fabrication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional adhesives are used to attach urethane foam to carrier tapes, then the adhesive can provide basic bonding, but it lacks selective adhesion to different substrates (plastic films and urethane foam)

Engineering Contradiction:

Improveselective adhesion to different substratesVSAvoidbonding strength

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The adhesive composition is formulated with specific components (bis-alkenyl-terminated polydiorganosiloxane, polyorganosilicate resin, polyorganohydrogensiloxane) that create different adhesion characteristics for different substrates. The composition achieves strong adhesion to urethane foam while maintaining controlled adhesion to plastic films, enabling selective bonding during the carrier tape formation process

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses a composite adhesive system combining multiple silicone-based polymers with specific functional groups. This composite composition integrates the benefits of different materials to achieve both strong bonding to urethane foam and controlled release from plastic films, which cannot be achieved with conventional single-material adhesives

Inventive Principle:

Principle #40Composite materials

2Strength

If urethane foam is used as shock absorber, then it provides protection from shocks, but it is soft and thin and cannot be handled independently

Engineering Contradiction:

Improveshock absorption capabilityVSAvoidhandleability

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The patent combines the urethane foam shock absorber with a carrier tape through the specially formulated adhesive. The adhesive creates a strong bond between the soft urethane foam and the rigid carrier tape, allowing the foam to be handled independently as part of the composite structure while retaining its shock absorption properties

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The carrier tape structure with the adhesive-bonded urethane foam creates a flexible yet handleable assembly. The thin film carrier tape provides structural support for handling, while the bonded urethane foam maintains its protective cushioning function

Inventive Principle:

Principle #30Flexible shells and thin films

3Strength

If the adhesive is too strong to bond urethane foam securely, then protection is enhanced, but delamination becomes difficult

Engineering Contradiction:

Improveadhesion strength to urethane foamVSAvoiddelamination ease

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The adhesive composition is designed with differential adhesion properties - it creates strong bonds with urethane foam through specific chemical interactions while maintaining weaker, controlled adhesion to plastic films. This localized variation in adhesion strength enables secure bonding where needed and easy delamination where required

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent controls the adhesion parameters of the adhesive by adjusting the composition ratios of different silicone polymers and functional groups. This allows optimization of the bond strength to achieve both secure attachment during fabrication and controlled release during delamination

Inventive Principle:

Principle #35Parameter changes

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 composition achieves strong and selective adhesion to both plastic films and urethane foam substrates, ensuring effective protection and easy delamination, enhancing the handling and protection of display devices during fabrication processes.

Implementation Method 1

A pressure sensitive adhesive composition is curable via hydrosilylation reaction

Methodology Applied

Scientific EffectHydrosilylation reaction: Chemical Bonding

Data Source

PatentUS11149175B2Pressure sensitive adhesive and preparation and use thereof

Publication Date: 2021.10.19 DOW SILICONES CORP

AI summary

A silicone pressure sensitive adhesive composition includes an alkenyl-terminated polydiorganosiloxane, a polyorganosilicate resin, a polyorganohydrogensiloxane crosslinker, a hydrosilylation reaction catalyst, a hydrosilylation reaction inhibitor, and a solvent. The composition cures to form a pressure sensitive adhesive with selective adhesion to different substrates, including urethane foam. The pressure sensitive adhesive composition, pressure sensitive adhesive, and urethane foam article including the pressure sensitive adhesive are useful in electronics applications for the protection of display devices.