Viscoelastic polyurethane foam and method of making

The production method for viscoelastic polyurethane foam using a specific formulation addresses the challenge of achieving high resilience and thermal stability with low compression set, resulting in improved mechanical properties for flexible and durable applications.

WO2025128194A1PCT designated stage expired Publication Date: 2025-06-19DOW GLOBAL TECHNOLOGIES LLC
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Patent Information

Application Number
PCT/US2024/051240
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-12-15
Filing Date
2024-10-14
Publication Date
2025-06-19

AI Technical Summary

Technical Problem

Existing viscoelastic polyurethane foams face challenges in achieving high resilience and low compression set properties while maintaining good thermal stability and mechanical strength, particularly in applications requiring flexibility and durability.

Method used

A method for producing viscoelastic polyurethane foam using a specific formulation of polyols and isocyanates, along with additives to enhance resilience and thermal stability, while maintaining mechanical strength and flexibility.

Benefits of technology

The solution results in viscoelastic polyurethane foam with improved resilience, low compression set, and enhanced thermal stability, suitable for applications demanding flexibility and durability.

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Abstract

Viscoelastic foams are made from a foam formulation that contains a mixture of polyols. The main polyol by weight is a random copolymer of 65 to 80 wt.-% ethylene oxide and correspondingly 35 to 20 wt.-% propylene oxide. The random copolymer is made using certain metallic catalysts. The viscoelastic foams are characterized by unexpectedly low compression sets.
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Description

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Claims

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