Water-dispersible polyurethane, water-dispersible polyurethane composition comprising same, adhesive composition comprising same water-dispersible polyurethane composition, and article having same adhesive composition applied thereto

A water-dispersible polyurethane composition with specific components addresses the inadequacies of existing adhesive technologies by enhancing adhesive strength and stability for electrical steel sheet laminates, offering an environmentally friendly solution.

WO2025239716A1 Publication Date: 2025-11-20SAMYANG INNOCHEM CORP
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Patent Information

Application Number
PCT/KR2025/006683
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-05-16
Filing Date
2025-05-16
Publication Date
2025-11-20

AI Technical Summary

Technical Problem

Existing adhesive compositions for laminating electrical steel sheets, such as those using polyethylene acrylate or polyurethane, fail to provide sufficient adhesive strength, and there is a need for an environmentally friendly alternative that maintains water-dispersible stability and storage stability.

Method used

A water-dispersible polyurethane composition comprising anhydrous sugar alcohol-alkylene oxide adduct, polyisocyanate, (meth)acrylic group-containing phosphoric acid compound, and hydrophilic ionic group-containing diol compound, formulated at specific weight ratios to enhance adhesive strength and stability.

Benefits of technology

The composition achieves significantly improved metal-to-metal adhesive strength and maintains excellent water-dispersible and storage stability, suitable for laminating electrical steel sheets without conventional fastening methods.

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Abstract

The present invention relates to a water-dispersible polyurethane, a water-dispersible polyurethane composition comprising same, an adhesive composition comprising the same water-dispersible polyurethane composition, and an article having the same adhesive composition applied thereto and, more specifically, to a water-dispersible polyurethane, a water-dispersible polyurethane composition comprising same, an adhesive composition comprising the same water-dispersible polyurethane composition, and an article (for example, an electrical steel sheet laminate) having the same adhesive composition applied thereto, wherein the water-dispersible polyurethane comprises, as polymerization units, a polyol component including an anhydrosugar alcohol-alkylene oxide adduct, a polyisocyanate component, a (meth)acrylic group-containing phosphoric acid-based compound, and a hydrophilic ion group-containing diol compound, and with a combination thereof at a specific weight ratio, the water-dispersible polyurethane, when used in an adhesive composition, can provide remarkably improved adhesive strength (particularly, metal-metal adhesive strength) compared to the prior art, while also exhibiting excellent water-dispersion stability and storage stability.
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