TPU from Biorenewable Isocyanate

Patent Title: BIO-BASED DIISOCYANATE AND CHAIN EXTENDERS IN CRYSTALLINE SEGMENTED THERMOPLASTIC POLYESTER URETHANES

 Number/Link: WO2016041076

Applicant/Assignee: Trent University

Publication date: 24-03-2016

Gist”:  TPU with highly crystalline hard segment is based on 1,7 heptamethylenediisocyanate

Why it is interesting: According to this application, polyester TPUs with crystalline hard segments can be produced using 1,7-heptamethylenediisocyanate. The HPMDI is reacted with a 2000MW poly(ethyleneadipate) diol and a short chain diol as chain extender. The  TPUs show a high hard-segment crystallinity, resulting in improved phase separation and in a (semi-)crystalline softphase which has a significant reinforcement effect. The TPUs are thermally stable up to 250°C and show a toughness and strength comparable to conventional TPUs. HPMDI can reportedly be made from natural oils using the Curtius rearrangement – but no reference is given.

Curtius Rearrangment

Curtius Rearrangment

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3 Comments

  1. As to the mentioned aliphatic isocyanate , this is not an easy way. This type of structure / segments analysis can also be done with adipic acid , 1,6-hexanediol and HDI isocyanate . I wonder if the differences will be that great. Looks a bit like ” l’art pour l’art ” .

    Reply
  1. TPU from Oleic Acid | Innovation in Polyurethanes

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