Urethane prepolymer composition solution

The urethane prepolymer composition solution with specific components and properties addresses slow curing and visibility issues, enabling rapid formation of transparent, high-strength urethane products with improved coating properties.

JP7711418B2Active Publication Date: 2025-07-23TOSOH CORP
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Patent Information

Application Number
JP2021072435
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-04-22
Publication Date
2025-07-23
Estimated Expiration
2041-04-22

AI Technical Summary

Technical Problem

Existing urethane prepolymer compositions using polyalkylene oxides with unsaturated monools face issues of slow curing, low molecular weight, poor tensile strength, and visibility due to strong coloring or poor film smoothness, making them unsuitable for high-strength, transparent, and easily coated products.

Method used

A urethane prepolymer composition solution containing an NCO group-terminated urethane prepolymer, a urethanization catalyst with a metal component, and a glycol ether solvent with an sp value of 8.0 or more, within specific concentration and viscosity ranges, to achieve appropriate coloring, good visibility, and high transparency.

Benefits of technology

The solution enables rapid formation of a highly transparent, high-strength urethane cured product with improved visibility and coating properties, addressing the limitations of previous compositions.

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Abstract

To provide a highly transparent urethane prepolymer composition solution having moderate coloration and good visibility which contributes to rapid formation of a cured urethane material having high strength with good curability, and to provide a highly transparent cured urethane material having good appearance, moderate coloration and high visibility.SOLUTION: There is provided a urethane prepolymer composition solution which comprises an NCO group-terminated urethane prepolymer (D), a urethanization catalyst comprising a metal component, and a glycol ether solvent having an SP value of 8.0 or more, wherein the urethane prepolymer (D) is at least a reaction product of a polyol (A) and a polyisocyanate (C), a content of the glycol ether solvent having an SP value of 8.0 or more in the urethane prepolymer composition solution is in a range of 0.1 to 20 wt.%, a concentration of the urethane prepolymer (D) is 75 wt.% to 99.9 wt.% and the urethane prepolymer composition solution has a Gardner color number of 2 to 13.SELECTED DRAWING: None
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Citation Information

Patent Citations

  • Urethane-forming composition

    JP2020076011A

  • Urethane forming composition

    JP2020158551A