Urea Methacrylate Silane Barrier for Delamination Resistance
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Solution Overview
Problem
Existing multilayer barrier assemblies and films face challenges in achieving robust adhesion and maintaining moisture barrier performance, particularly when exposed to high temperatures and humidity, leading to potential delamination issues.
Innovation Solution
The use of a composite barrier assembly comprising a protective polymer layer formed from urea (multi)-(meth)acrylate (multi)-silane precursor compounds, which reacts to create a robust chemical bond with inorganic oxide surfaces and (meth)acrylate coatings, enhancing adhesion and maintaining physical properties for improved moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multilayer barrier assemblies are used, then moisture barrier performance is provided, but adhesion robustness deteriorates under high temperature and humidity conditions
Solution Approach 1:
The patent uses a composite polymer layer combining silane-modified polyurethane and polyacrylate components. The silane groups form chemical bonds with the inorganic oxide barrier layer, while the polyurethane and polyacrylate segments provide flexibility and adhesion. This composite structure maintains strong adhesion under high temperature and humidity conditions by creating a hybrid organic-inorganic interface that resists delamination.
Solution Approach 2:
The patent modifies the chemical composition of the polymer layer by incorporating silane functional groups with hydrolyzable moieties. These silane groups undergo hydrolysis and condensation reactions to form siloxane bonds with the oxide surface. The parameter change from conventional polymers to silane-containing polymers enables chemical bonding capability, significantly improving adhesion robustness under harsh environmental conditions.
2Strength
If protective polymer layers are applied to enhance adhesion, then bonding strength improves, but moisture barrier performance may deteriorate
Solution Approach 1:
The patent creates local chemical bonding zones at the interface between the polymer layer and the inorganic oxide barrier layer through silane groups. The silane-modified polyurethane and polyacrylate components concentrate bonding functionality at the interface while maintaining the bulk polymer's moisture barrier properties. This localized approach allows strong adhesion without compromising the overall moisture barrier performance of the multilayer assembly.
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 solution provides enhanced adhesion and delamination resistance, maintaining effective moisture barrier performance even under high temperature and humidity conditions, making it suitable for flexible applications in electronic devices.
Implementation Method 1
RS is a silane containing group of the formula —R1—[Si(Yp)(R2)3-p]q... each Y is a hydrolysable group
Implementation Method 2
reacts to create a robust chemical bond with inorganic oxide surfaces
Implementation Method 3
RA is a (meth)acryl group containing group of the formula R11-(A)n... A is a (meth)acryl group having the formula X2—C(O)—C(R3)═CH2
Data Source
AI summary
Urea (multi)-(meth)acrylate (multi)-silane precursor compounds, synthesized by reaction of (meth)acrylated materials having isocyanate functionality with aminosilane compounds, either neat or in a solvent, and optionally with a catalyst, such as a tin compound, to accelerate the reaction. Also described are articles including a substrate, a base (co)polymer layer on a major surface of the substrate, an oxide layer on the base (co)polymer layer; and a protective (co)polymer layer on the oxide layer, the protective (co)polymer layer including the reaction product of at least one urea (multi)-(meth)acrylate (multi)-silane precursor compound synthesized by reaction of (meth)acrylated materials having isocyanate functionality with aminosilane compounds. The substrate may be a (co)polymer film or an electronic device such as an organic light emitting device, electrophoretic light emitting device, liquid crystal display, thin film transistor, or combination thereof. Methods of making the urea (multi)-(meth)acrylate (multi)-silanes and their use in composite films and electronic devices are described.