Neopentylglycol
April 21, 2017 15:19
Title: THERMOPLASTIC POLYURETHANE MATERIALS FOR FORMING MEDICAL DEVICES
Number/Link: WO2017/066381
Applicant/Assignee: Becton Dickinson
Publication Date: 20 april 2017
“Gist”: High hardblock TPU, based on side-chain branched chain extenders, softens in water
Why it is interesting: The invention is related to thermoplastic polyurethanes for medical applications especially for intravenous catheters. These catheters need to have a high stiffness when inserted but need to become flexible once in place to prevent injuries. This is accomplished with TPUs based on MDI, PTMEG and either 2,2-dimethyl-1,3-propanediol (neopentylglycol) or 2-methyl-1,3-propanediol (MPdiol) and having a hardblock content of 50 to 75%. The examples show indeed an increased stiffness at ambient conditions and a larger softening when soaked in saline solution compared to TPU produced with a linear chain extender. It is however not mentioned which linear chain extender was used.
Neopentylglycol
Posted by Gerhard Bleys
Categories: Thermoplastics
Tags: biomedical, chain extender, elastomers, glass transition, Hard domain, hydrophilic, hydrophobic, polyether polyol, TPU
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