Adhesive Composition for Polymer Sheet Bonding
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Solution Overview
Problem
Existing adhesive compositions fail to achieve high adhesive strength between polymer sheets, particularly between alicyclic polyamide resin sheets and polarizing sheets, and those containing dichroic dyes, which are essential for durable optical articles.
Innovation Solution
A novel adhesive composition comprising an end-unreactive urethane urea resin combined with specific polyisocyanate compounds, including those with isocyanate groups bonded to secondary carbon and others with 4 to 40 carbon atoms, forming a crosslinked structure for enhanced bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a two-liquid type urethane-based resin adhesive is used to bond polymer sheets, then the adhesive can provide basic bonding functionality, but the adhesive strength is insufficient and does not meet high durability requirements
Solution Approach 1:
The invention changes the chemical parameters of the adhesive system by introducing a polyisocyanate compound that reacts with the urethane urea resin to form a crosslinked structure. This chemical transformation converts a linear polymer system into a networked crosslinked system, fundamentally altering the adhesive's mechanical properties and achieving both high strength and durability.
Solution Approach 2:
The invention creates a composite adhesive system by combining the urethane urea resin with polyisocyanate compounds. The resulting crosslinked structure integrates the bonding capabilities of the urethane urea resin with the reactive crosslinking properties of polyisocyanates, producing a composite material with superior adhesive strength and durability compared to either component alone.
2Strength
If adhesive composition is used to bond alicyclic polyamide resin sheets with polarizing sheets containing dichroic dyes, then basic adhesion is achieved, but the adhesive strength is significantly reduced and bonding is insufficient
Solution Approach 1:
The invention modifies the adhesive composition by adding polyisocyanate compounds that react with the urethane urea resin to form a crosslinked structure. This chemical parameter change enhances the adhesive's ability to bond to polarizing sheets containing dichroic dyes, overcoming the insufficient adhesion experienced with conventional adhesive compositions.
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 high durability and adhesion between polymer sheets, effectively bonding alicyclic polyamide resin sheets and polarizing sheets, including those with dichroic dyes, resulting in robust optical articles with improved optical and mechanical properties.
Implementation Method 1
forming a crosslinked structure for enhanced bonding
Data Source
AI summary
To provide an adhesive composition capable of firmly bonding polymer sheets together, comprising:(I) 100 parts by mass of an end-unreactive urethane urea resin; and(III) 4.0 to 20 parts by mass of a polyisocyanate compound having at least two isocyanate groups in the molecule, wherein the polyisocyanate compound (III) contains (IIIA) a polyisocyanate compound having an isocyanate group bonded to secondary carbon and (IIIB) a polyisocyanate compound having 4 to 30 carbon atoms in the molecule other than the component (IIIA), and the amount of the component (IIIB) is 10 to 500 parts by mass based on 100 parts by mass of the component (IIIA).