Resin Composition Adhesion Smoothness Display Devices
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Solution Overview
Problem
Resin compositions used in display devices face challenges in achieving excellent adhesion and smoothness on uneven surfaces, particularly due to variations in shape and the presence of recesses or voids, which affect the uniformity and optical properties of the adhesive layers.
Innovation Solution
A resin composition comprising a first (meth)acrylic resin with a weight average molecular weight of 10,000 to 40,000, two or more second (meth)acrylic resins with molecular weights of 100 to 250, and multiple photoinitiators, specifically including urethane (meth)acrylate and hydroxy group-containing acrylates, is used to form an adhesive member with improved adhesion and smoothness, optimized for use in display devices with complex geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a resin composition is applied to uneven surfaces with recesses or voids, then adhesion is improved, but uniformity and smoothness of the adhesive layer deteriorate
Solution Approach 1:
The patent adjusts the molecular weight distribution of (meth)acrylic resins, specifically using a first (meth)acrylic resin with weight average molecular weight of 10,000-40,000 and second (meth)acrylic resins with molecular weights of 100-250, to optimize viscosity and coating properties for uneven surfaces
Solution Approach 2:
The patent employs a composite resin system combining multiple (meth)acrylic resins with different molecular weights and characteristics, along with specific photoinitiators, to achieve both adhesion to uneven surfaces and uniformity of the final adhesive layer
2Manufacturing precision
If the resin composition is optimized for smoothness, then optical properties are improved, but adhesion to uneven surfaces deteriorates
Solution Approach 1:
The patent optimizes the molecular weight parameters of the resin components, with the first (meth)acrylic resin having weight average molecular weight of 10,000-40,000 and second (meth)acrylic resins having molecular weights of 100-250, to achieve balanced viscosity that enables both adhesion and smoothness
Solution Approach 2:
The patent uses different (meth)acrylic resins with specific properties tailored for different functions: higher molecular weight resins for adhesion and lower molecular weight resins for flow and smoothness, creating local optimization within the composite material
3Adaptability or versatility
If members have various shapes with recesses or voids, then adaptability is improved, but coating uniformity deteriorates
Solution Approach 1:
The patent controls the viscosity of the resin composition by selecting specific molecular weights for the (meth)acrylic resins, enabling the adhesive to flow into and fill recesses and voids while maintaining coating uniformity across various member shapes
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 resin composition ensures excellent adhesion, smoothness, and optical properties by maintaining a viscosity of 20 mPa·s to 25 mPa·s and a contact angle of 10° to 15°, enabling uniform coating and high peel strength, thereby enhancing the performance of adhesive members in display devices.
Implementation Method 1
two or more different photoinitiators
Data Source
AI summary
According to one aspect of the invention, a resin composition for use as an adhesive member in a display device includes: a first (meth)acrylic resin having a weight average molecular weight of about 10,000 to about 40,000; two or more second (meth)acrylic resins having a molecular weight of about 100 to about 250 and differing from one another; and two or more different photoinitiators.