Optical Bonding Silicone with UV Blocker for Outdoor Displays

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Solution Overview

Problem

Existing optical bonding materials for outdoor displays, such as those used in public viewing and automotive touch screens, face challenges in UV stability due to exposure to solar radiation, particularly UVA and UVB, which can degrade the materials and affect their performance, and current methods for introducing UV-blocking capabilities are costly and may not ensure compatibility with traditional formulations.

Innovation Solution

A hydrosilylation curable silicone composition incorporating organopolysiloxanes with silicon-bonded alkenyl groups, organohydrogenpolysiloxanes, a hydrosilylation catalyst, and a UV-blocker like 2-(2H-Benzotriazol-2-yl)-6-dodecyl-4-methylphenol, which enhances UV stability and transparency while maintaining the original properties of the silicone.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If new molecules combining silicone and UV blocking function groups are generated by covalent bonding, then UV blocking capability is improved, but manufacturing complexity and cost increase

Engineering Contradiction:

ImproveUV blocking capabilityVSAvoidsynthesis and purification process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent separates the UV blocking function from the silicone polymer structure by using physical blending of UV absorbers into the silicone matrix, rather than covalent bonding. This segmentation allows independent optimization of UV blocking performance and silicone properties, simplifying the synthesis process to straightforward mixing and curing operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a composite material system combining silicone polymer with UV absorbing additives. This composite approach enables the silicone to maintain its bonding properties while the added UV absorbers provide protection, achieving both functions without complex molecular synthesis.

Inventive Principle:

Principle #40Composite materials

2Reliability

If new molecules with UV blocking function groups are introduced, then UV blocking capability is improved, but compatibility with traditional silicone formulations deteriorates

Engineering Contradiction:

ImproveUV blocking capabilityVSAvoidcompatibility with traditional silicone formulations

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent uses commercially available UV absorbing additives as intermediaries that are already known to be compatible with silicone formulations. These additives act as mediators between the UV blocking function and the silicone matrix, ensuring compatibility without requiring new molecular designs.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent optimizes parameters such as UV absorber concentration, molecular weight distribution, and curing conditions to achieve compatibility. By adjusting these parameters, the formulation maintains traditional silicone properties while incorporating UV blocking capability.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If UV blocking function groups are diluted in new molecules, then UV blocking capability is improved, but the percentage of new molecules must be relatively high, changing original formulations

Engineering Contradiction:

ImproveUV blocking capabilityVSAvoidpercentage of new molecules

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent optimizes the concentration of UV absorbing additives to achieve effective UV blocking with minimal disruption to the original silicone formulation. By carefully controlling the quantity of UV absorbers and adjusting curing parameters, the patent maintains the original formulation's properties while providing adequate UV protection.

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 composition effectively protects against UVA and UVB radiation, maintaining the optical clarity and durability of outdoor displays while reducing operating temperatures, with adjustable UV cutoff and minimal impact on yellow index and adhesion strength.

Implementation Method 1

a UV-blocker like 2-(2H-Benzotriazol-2-yl)-6-dodecyl-4-methylphenol, which enhances UV stability and transparency

Methodology Applied

Scientific EffectUV absorption: Absorption (EM radiation)

Implementation Method 2

at least one hydrosilylation reaction catalyst, in an amount which accelerates the curing of the present composition

Methodology Applied

Scientific EffectHydrosilylation: Chemical Bonding

Data Source

PatentEP4139389B1Optical bonding silicone with UV blocker for outdoor application

Publication Date: 2023.11.29 WACKER CHEMIE AG

Figure 1

AI summary

The invention relates to transparent silicone compositions comprising as special UV blocker and its use in optical bonding outdoor applications.