Prepolymer composition and polyurethane resin

JP2026097478APending Publication Date: 2026-06-16MITSUI CHEMICALS INC
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
MITSUI CHEMICALS INC
Filing Date
2024-12-04
Publication Date
2026-06-16

AI Technical Summary

Benefits of technology

【0011】 本発明のポリウレタン樹脂は、プレポリマー組成物に含まれるイソシアネート基末端プレポリマーの分散度(Mw/Mn)が、所定値以下である。また、本発明のポリウレタン樹脂は、ポリイソシアネート成分における、脂環族ポリイソシアネートの割合が所定値範囲内である。さらに、本発明のポリウレタン樹脂は、未反応のポリイソシアネート成分の濃度が、所定値以下である。

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Abstract

To provide a prepolymer composition for producing a polyurethane resin that combines excellent thermal stability, appearance, mechanical properties, and low heat generation, a polyurethane resin obtained from the prepolymer composition, and a method for producing the prepolymer composition. [Solution] A prepolymer composition containing an isocyanate-terminated prepolymer. The isocyanate-terminated prepolymer contains a reaction product between a polyisocyanate component containing alicyclic polyisocyanates other than 1,4-bis(isocyanatomethyl)cyclohexane and 1,4-bis(isocyanatomethyl)cyclohexane and a polyol component. The dispersion (Mw / Mn) of the isocyanate-terminated prepolymer is 1.85 or less. The proportion of the alicyclic polyisocyanate in the polyisocyanate component is 0.5% by mass or more and 20.0% by mass or less. The concentration of unreacted polyisocyanate component is 5.0% by mass or less.
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Claims

1. A prepolymer composition containing an isocyanate-terminated prepolymer, The isocyanate-terminated prepolymer contains a reaction product of a polyisocyanate component, which includes alicyclic polyisocyanates other than 1,4-bis(isocyanatomethyl)cyclohexane and 1,4-bis(isocyanatomethyl)cyclohexane, and a polyol component. The dispersion degree (Mw / Mn) of the isocyanate group-terminated prepolymer is 1.85 or less. The proportion of the alicyclic polyisocyanate in the polyisocyanate component is 0.5% by mass or more and 20.0% by mass or less. A prepolymer composition having a concentration of unreacted polyisocyanate components of 5.0% by mass or less.

2. The prepolymer composition according to claim 1, comprising the alicyclic polyisocyanate, 1,3-bis(isocyanatomethyl)cyclohexane.

3. The prepolymer composition according to claim 1, wherein the proportion of the alicyclic polyisocyanate is 0.8% by mass or more and 9.0% by mass or less.

4. A polyurethane resin which is a reaction product of the prepolymer composition according to claim 1 or 2 and a chain extension component.