Polyurea Release Layer Composition for Flexible Electronics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing release layers for flexible electronic devices lack high heat resistance and moderate releasability, leading to instability and poor productivity in manufacturing processes.
Innovation Solution
A release layer-forming composition comprising polyurea with specific repeating units, an acid compound or its salt, a crosslinking agent with nitrogen atoms substituted with hydroxyalkyl or alkoxymethyl groups, a polymeric additive with specific repeating units, and a solvent, which forms a release layer with high heat resistance and moderate stickiness and releasability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional release layer is used for flexible electronic devices, then the device can be manufactured, but the release layer lacks high heat resistance and moderate releasability, leading to instability during storage and poor productivity
Solution Approach 1:
The patent modifies the chemical composition parameters of the release layer by incorporating specific polyurea structures with prescribed repeating units and controlling the content ratio of different repeating units (wherein A1-A6 are each independently a hydrogen atom, methyl group, or ethyl group). This parameter optimization enables the release layer to simultaneously achieve high heat resistance, moderate releasability, and excellent stability after film formation, directly resolving the contradiction between reliability and productivity
Solution Approach 2:
The patent creates a composite release layer system combining polyurea with specific repeating units, acid compounds or their salts, crosslinking agents with nitrogen atoms substituted with hydroxyalkyl or alkoxymethyl groups, and polymeric additives. This multi-component composite formulation synergistically provides high heat resistance, excellent stickiness to base body, and moderate releasability with resin substrates, solving the reliability-productivity contradiction through material composition optimization
2Strength
If the release layer has strong adhesion to the base body, then stability during manufacturing is improved, but releasability with the resin substrate deteriorates
Solution Approach 1:
The patent applies local quality by designing the release layer with differentiated adhesive properties: the polyurea structure with specific repeating units provides strong adhesion to the base body (glass substrate) while simultaneously maintaining moderate releasability with the resin substrate. The prescribed repeating unit structure creates asymmetric interaction strengths with different materials, enabling strong base body bonding while allowing easy substrate release
Solution Approach 2:
The patent optimizes the chemical structure parameters of the polyurea, specifically the prescribed repeating unit composition and the content ratio of different repeating units, to achieve differential adhesion. This parameter control enables the release layer to exhibit strong stickiness to the base body while maintaining moderate releasability with the resin substrate, resolving the contradiction between strength and ease of operation
3Productivity
If the release layer is formed as a film for long-term storage, then productivity is improved, but heat resistance and releasability stability deteriorate
Solution Approach 1:
The patent incorporates crosslinking agents with nitrogen atoms substituted with hydroxyalkyl or alkoxymethyl groups into the release layer formulation before film formation. This preliminary incorporation of crosslinking components enables the film to develop enhanced heat resistance during subsequent processing while maintaining stability during long-term storage in the film-manufactured state, resolving the contradiction between productivity and heat resistance
Solution Approach 2:
The patent creates a composite film system combining polyurea with prescribed repeating units, acid compounds or their salts, crosslinking agents, and polymeric additives. This composite structure provides inherent heat resistance and storage stability while maintaining moderate releasability, enabling long-term film storage without deteriorating heat resistance or releasability, thus solving the productivity-heat resistance contradiction
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 provides a release layer with high heat resistance, excellent stickiness to a base body, and moderate releasability with a resin substrate, enabling efficient separation of resin substrates without damage during manufacturing, thus improving productivity and yield.
Implementation Method 1
a release layer-forming composition containing (A) a polyurea including a prescribed repeating unit, (B) an acid compound or a salt thereof, (C) a crosslinking agent selected from compounds having a nitrogen atom substituted with a hydroxyalkyl group and/or an alkoxymethyl group, (D) a polymeric additive including a prescribed repeating unit
Data Source
AI summary
Provided is a composition for forming release layers which comprises (A) a polyurea including a repeating unit represented by formula (1), (B) an acid compound or a salt thereof, (C) a crosslinking agent selected from among compounds having a nitrogen atom substituted by a hydroxyalkyl group and/or an alkoxymethyl group, (D) a polymeric additive including a repeating unit represented by formula (a1), a repeating unit represented by formula (b), and a repeating unit represented by formula (c), and (E) a solvent, wherein the polymeric additive (D) is contained in an amount of 5-100 parts by mass per 100 parts by mass of the polyurea (A).(In the formulae, the RA moieties each are independently a hydrogen atom or a methyl group; RB1 is a branched C3-4 alkyl group in which at least one hydrogen atom has been replaced with a fluorine atom; RC is a C1-10 hydroxyalkyl group; and RD is a C6-20 polycycloalkyl group or C6-12 aryl group.)