Oxidation-Proof TPU

Patent Title: POLYURETHANE, METHOD OF PREPARATION, AND ARTICLE COMPRISING THE POLYURETHANE

 Number/Link:  WO2018/057488

Applicant/Assignee:  THE UNIVERSITY OF MASSACHUSETTS

Publication date:  29 March 2018

Gist”:  TPU based on hydrogenated diene diols

Why it is interesting: TPUs based on polyether- or polydiene-diols are prone to oxidative degradation and therefore less useful for e.g. medical applications.  According to this invention, oxidation-stable TPUs can be prepared from hydrogenated polydiene diols with an Mn of 500 to 2000, combined with 5-25% (w/w) polyether diols, chain extender and diisocyanate.  In an example a hydogenated polybutadienediol with Mn of 2000 Da was reacted with 4,4′-MDI together with PTMEG 1000 and BDO in toluene.  At a hardblock content of 35% the TPU showed a Shore hardness of 80A, 250MPa tensile strength and an elongation at break of 520%.

PIB

Hydrogenated (1,2) polybutadiene