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.

 

Aliphatic TPU with Reduced Effloresence

Patent Title: ALIPHATIC THERMOPLASTIC POLYURETHANES, PRODUCTION AND USE THEREOF

 Number/Link:   WO2018/192936 (German)

Applicant/Assignee:  Covestro

Publication date: 25 October 2018

Gist”: TPU based on 1,10-decanediisocyanate shows reduced blooming

Why it is interesting: Aliphatic thermoplastic polyurethanes, based on hexanediisocyanate (HDI) can show “blooming” i.e. the formation of a white precipitate on the surface of the material.  It is believed that this is caused by the formation of cyclic oligourethanes migrating to- and forming crystals on the surface. According to this invention, this blooming behaviour can be prevented by using long-chain aliphatic diisocyanates like 1,10-diisocyanatodecane or 1,12-diisocyanatododecane instead of HDI.

DDI

1,10-diisocyanatohexane (DDI)

 

TPU Nanocomposite

Patent Title: POLYURETHANE COMPOSITE

 Number/Link: WO2018/185650 (Spanish)

Applicant/Assignee: UNIVERSIDAD DE ANTIOQUIA

Publication date: 11 October 2018

Gist”: Protein-stabilized nano- calciumcarbonate particles are incorporated into a thermoplastic polyurethane composition

Why it is interesting: Calciumcarbonate nanoparticles are prepared by mixing a solution of sodium carbonate, sodium caseinate and calciumchloride in a high pressure homogenizer. Particles are formed of CaCO3 embedded in a protein matrix that stabilizes that particles against aggregation. Particle size is (pref) 150-300nm with primary CaCO3 particles of 5-10nm. The particles are used in an amount of (pref) 0.6-1% (w/w) on a TPU composition. The TPUs are said to show increased mechanical properties and improved cell growth and are said to be useful for biomedical applications.

nanoparticle

Stabilized nanoparticles (Wikipedia)