Adhesive Resin Composition for Laminated Glass Interlayers

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Solution Overview

Problem

There is a need for an adhesive resin composition that offers improved transparency and adhesiveness to a polyester resin layer, while also maintaining high adhesiveness to glass, to address the challenges in laminated glass and solar cell module applications.

Innovation Solution

The adhesive resin composition comprises an ethylene-unsaturated ester copolymer and an epoxy group-containing ethylene-based copolymer, with specific content ratios and properties that enhance transparency and adhesiveness to both polyester resin and glass.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If an adhesive resin composition is laminated between the ionomer resin layer and the polyester resin layer to achieve adhesiveness to polyester resin, then adhesiveness to polyester resin layer is improved, but transparency of the laminated glass decreases

Engineering Contradiction:

Improveadhesiveness to polyester resin layerVSAvoidtransparency of laminated glass

Core Design Contradiction:

StrengthVSIllumination intensity

Solution Approach 1:

The patent uses a composite resin composition containing both a polyester resin component (for adhesiveness to polyester resin layer) and an ionomer resin component (for transparency and glass adhesiveness). This composite material simultaneously achieves both required properties: the polyester component ensures strong bonding to the polyester resin layer, while the ionomer component maintains high transparency and provides excellent adhesion to glass surfaces.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the compositional parameters of the adhesive resin, specifically controlling the ratio of polyester resin to ionomer resin components, and adjusting molecular weight and functional group contents. By precisely controlling these parameters, the adhesive achieves both high transparency (by maximizing ionomer content within effective ranges) and strong adhesiveness to polyester resin (by ensuring sufficient polyester resin content with appropriate functional groups).

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If the ionomer resin layer is directly laminated with the polyester resin layer to simplify the structure, then device complexity is reduced, but adhesiveness to polyester resin layer is insufficient

Engineering Contradiction:

Improvestructure of laminated glassVSAvoidadhesiveness to polyester resin layer

Core Design Contradiction:

Device complexityVSStrength

Solution Approach 1:

The patent creates a multi-functional adhesive resin that simultaneously performs multiple functions: it bonds to both glass and polyester resin layers, maintains high transparency, and provides mechanical cushioning. This universal adhesive eliminates the need for separate functional layers, simplifying the overall structure while achieving all required performance characteristics including strong adhesiveness to polyester resin.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If a polyester resin layer is added to impart design properties, then adaptability or versatility is improved, but adhesiveness issues arise at the interface between ionomer and polyester resin

Engineering Contradiction:

Improvedesign properties of laminated glassVSAvoidadhesiveness at interface between ionomer resin layer and polyester resin layer

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The patent employs a composite adhesive resin system that bridges the ionomer resin layer and polyester resin layer. The polyester resin component of the adhesive provides chemical compatibility and strong bonding to the polyester resin layer (enabling design properties), while the ionomer resin component ensures strong adhesion to the glass substrate, thus resolving the interfacial adhesiveness problem while maintaining design versatility.

Inventive Principle:

Principle #40Composite materials

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

This composition achieves improved transparency and adhesiveness to polyester resin layers, while maintaining strong adhesiveness to glass, thereby enhancing the performance of laminated glass interlayers and solar cell encapsulants.

Implementation Method 1

an epoxy group-containing ethylene-based copolymer (B)

Methodology Applied

Scientific EffectEpoxy group reaction: Chemical Bonding

Data Source

PatentUS20250197697A1Adhesive resin composition, laminated glass interlayer, laminated glass, solar cell encapsulant, and solar cell module

Publication Date: 2025.06.19 DOW MITSUI POLYCHEMICALS CO LTD

AI summary

An adhesive resin composition includes: an ethylene-unsaturated ester copolymer (A); and an epoxy group-containing ethylene-based copolymer (B) (other than the ethylene-unsaturated ester copolymer (A)), in which a content of a constituent unit derived from an unsaturated ester in the ethylene-unsaturated ester copolymer (A) is more than 20 mass % with respect to all constituent units forming the ethylene-unsaturated ester copolymer (A), and an absolute value of a difference (X1−X2) between a content (X1) of a constituent unit derived from ethylene with respect to all the constituent units forming the ethylene-unsaturated ester copolymer (A) and a content (X2) of a constituent unit derived from ethylene with respect to all constituent units forming the epoxy group-containing ethylene-based copolymer (B) is 10 mass % or less.