TPU with High EMR Permeability

Patent Title: POLYURETHANES WITH GOOD PERMEABILITY FOR ELECTROMAGNETIC RADIATION

Number/Link: WO2019/002350 (German)

Applicant/Assignee: BASF

Publication Date: 3 January 2019

“Gist”:  TPU based on aliphatic polycarbonate diol

Why it is interesting: The invention relates to thermoplastic polyurethanes with a high permeabilty to electromagnetic radiation, especially in the 0.5 to 3 GHz frequency range. (I assume these materials are aimed at mobile phone covers and the like). ‘Surprisingly’ it was found that such TPUs can be prepared from polycarbonate diols which are based on butanediol, pentanediol or hexanediol. In the examples, TPUs based on these diols together with BDO and 1,6-HDI or 4,4′-MDI, show a lower dielectric loss factor at 400 MHz as compared to TPUs based on other polyols.

TPU cover

TPU mobile phone case.

 

Polyurethane Elastomer with High Dielectric Constant

Patent Title: DIPOLE-MODIFIED POLYURETHANE, METHOD FOR PRODUCING SAME, AND USE THEREOF IN THE PRODUCTION OF CAST ELECTROACTIVE POLYURETHANE-BASED ELASTOMER FILMS

 Number/Link: WO2016102320  (German)

Applicant/Assignee: Covestro

Publication date: 30-06-2016

Gist”: A molecule with high dipole moment is incorparted in the PU backbone

Why it is interesting: According to this invention a polyurethane with an increased dielectric constant can be prepared by first reacting an isocyanate (f>2)with a hydroxyl-functional dipole.  This ‘dipole-modified’ isocyanate is then used in a (preferred) amount of 5-10% on the rest of the isocyanate of an elastomer formulation.  The dipole is of the form HO-R-D-X-A, where  D is an electron donor, A is an electron acceptor and X is a residue with a delocalized electron system.  In an example N-2-hydroxyethyl-N-methyl-4-nitroanilin is reacted with a biuret based on HDI to make the ‘dipole-modified’ isocyanate. Polyurethane elastomer films with high dielectric constant can be used as electromechanical transducers in sensors, actuators, artifical muscle etc..

N-2-Hydroxyethyl-N-Methyl-4-Nitroanilin

N-2-Hydroxyethyl-N-Methyl-4-Nitroanilin

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