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1. US20160347900 - Softening thermoplastic polyurethanes using ionomer technology

Office United States of America
Application Number 15166948
Application Date 27.05.2016
Publication Number 20160347900
Publication Date 01.12.2016
Grant Number 10227440
Grant Date 12.03.2019
Publication Kind B2
IPC
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Applicants Matthew Becker
The University of Akron
Robert A. Weiss
Covestro, LLC
Zachary Kurtiss Zander
Don S. Wardius
Karl W. Haider
Bruce D. Lawrey
Inventors Matthew Becker
Robert A. Weiss
Zachary Kurtiss Zander
Don S. Wardius
Karl W. Haider
Bruce D. Lawrey
Agents Renner Kenner Greive Bobak Taylor & Weber
Title
(EN) Softening thermoplastic polyurethanes using ionomer technology
Abstract
(EN)

In one or more embodiments, the present invention provides a novel approach to the addition of plasticizers for softening TPUs, i.e., lowering the durometer and the melt viscosity. This approach involves incorporating bonded sulfonate groups with quaternary ammonium counterions into the TPU. In one or more embodiments of the present invention, the softening of TPU is achieved by incorporating an ionic diol, such as N,N-bis (2-hydoxyethyl)-2-aminoethane-sulfonic acid (BES), coupled with various bulky alkyl ammonium cations, during the chain extension step of the TPU synthesis. It is believed that that steric hindrance of the bulky quaternary ammonium groups weakens the dipole-dipole interactions of the sulfonate groups and/or lowers the crystallinity of the hard block, thereby creating additional free volume that softens the polymer and lowers the melt viscosity.