Thermoplastic PU-PDMS Copolymer

Patent Title: THERMOPLASTIC POLYURETHANE

Number/Link: WO2019/016313 (German)

Applicant/Assignee: BASF

Publication Date: 24 January 2019

“Gist”:  Thermoplastic polyurethane comprising OH-ended poly(dimethylsiloxane).

Why it is interesting: The invention relates to thermoplastic polyurethanes prepared from diisocyanate, polyether or polyester diol and a difunctional isocyanate-reactive polysiloxane.  The materials are said to have improved “haptic”-, hydrophobicity- and tensile properties while retaining the processibility of TPU and are useful for ‘on-body’ applications like wristbands. In the examples both 4,4′-MDI and HDI are used together with chain extenders, polyTHF, BDO-HDO adipate and EO capped PDMS to prepare TPUs ranging from 55 to 95 Shore A.

pdms-eo

EO-capped PDMS

Polyurethane Elastomers with High Abrasion Resistance

Title: POLYURETHANE WITH IMPROVED ABRASION RESISTANCE, THE METHOD FOR PREPARING THE SAME AND USE THEREOF

 Number/Link: US2013/0274365

Applicant/Assignee: Bayer

Publication date: 17-10-2013 (priority PCT/DE)

Gist”: Small amounts of polyisoprene improve abrasion resistance of elastomers

Why it is interesting: It is known that polyether polyols have advantages over polyester polyols for the production of polyurethane elastomers: the resulting elastomers have better low temperature properties, better hydroslysis resistance and antimicrobial properties, however the mechanical properties as well as the abrasion resistance are lower. According to this invention the abrasion resistance of polyether elastomers can be greatly improved by incorporating a small amount of polyisoprene in the formulation. In the examples 2% polyisoprene with a MW of 28,000 or 45,000 is used in a formulation of polyether polyol, butanediol, water and catalyst together with a non-disclosed isocyanate. The resulting elastomers have a density of 600 kg/m3 and show a markedly improved abrasion resistance.

Structural units present in polyisoprene

Structural units present in polyisoprene

POLYURETHANE WITH IMPROVED ABRASION RESISTANCE, THE METHOD FOR PREPARING THE SAME AND USE THEREOF

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