Polyol for polyurethane production and method to produce such polyol

The production of polyester polyol using isohexide and dicarboxylic acid reactions creates biobased polyurethane foams with improved rigidity and flame retardancy, addressing the limitations of aromatic-based methods.

WO2026154326A2PCT designated stage Publication Date: 2026-07-23UNILIN BVBA
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
UNILIN BVBA
Filing Date
2026-01-06
Publication Date
2026-07-23

AI Technical Summary

Technical Problem

Existing polyurethane production methods rely heavily on aromatic components, limiting the use of biobased materials and resulting in polyurethane products with lower sustainability.

Method used

A method for producing polyester polyol using isohexide, a biobased material, through chemical reactions with a dicarboxylic acid or its anhydride and a diol, ensuring the formation of polyester polyol molecules with primarily hydroxyl groups, which are then used to create polyurethane foams with a higher biobased content.

Benefits of technology

The method results in polyurethane foams, particularly rigid polyisocyanurate foams, with improved rigidity and flame retardancy, using only biobased materials and minimizing secondary hydroxyl groups for enhanced reactivity.

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Abstract

A method for manufacturing a polyester polyol composition comprises the step of providing isohexide, at least a reaction compound and a diol. The reaction compound comprises a dicarboxylic acid or an anhydride of a dicarboxylic acid, or combinations thereof. By chemical reaction between the isohexide, the reaction compound and the diol, a polyester polyol composition is obtained comprising polyester polyol molecules comprising primary hydroxyl groups. The isohexide, the reaction compound and the diol are integrated in the polyester polyol molecules.
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