“Innovation in Polyurethanes 2016” : a 70-pages in-depth review of the main 2016 polyurethane patent literature is now available as pdf e-book.
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Now Available: “Innovation in Polyurethanes 2016”
Posted by Gerhard Bleys on February 27, 2017
https://purpatents.com/2017/02/27/now-available-innovation-in-polyurethanes-2016/
Now Available: Non-Isocyanate Polyurethanes pdf
Non-Isocyanate Polyurethanes
Chemistry and Patent Situation
By Gerhard J.Bleys PhD
a pdf e-book
Non-isocyanate polyurethanes enjoy an increasing interest by both academia and industry. This is not only because of health and environmental concerns associated with the use of isocyanates and phosgene, but also because of some unique properties of these materials that can only be obtained with non-isocyanate chemistries. NIPUs can also be made 100% from renewable materials and can be CO2 ‘negative’.
Click here to order the report.
Posted by Gerhard Bleys on September 20, 2016
https://purpatents.com/2016/09/20/now-available-non-isocyanate-polyurethanes-pdf/
Highly Tuneable Shape Memory Polyurethanes
Patent Title: PROCESSABLE, TUNABLE THIOL-ENE CROSSLINKED POLYURETHANE SHAPE MEMORY POLYMERS
Number/Link: WO2016/126703
Applicant/Assignee: Texas A&M University
Publication date: 11-08-2016
“Gist”: SMPUs are made from combinations of different diisocyanates and chain extenders and different levels of crosslinking using thiol-ene click chemistry
Why it is interesting: This invention is about shape memory polyurethanes with tuneable glass transition temperature and stiffness. In a first step a low mole weight TPU is prepared from a diisocyanate and a short chain diol including some trimethylolpropane allyether (TMPAE) and allylalcohol as chain stopper. The TPU is then blended with a polythiol and a photoinitiator to allow for UV curing. The Tg can be tuned from 30 and 105°C by combining different types of chain extenders and di-iso’s ranging from DEG-HDI to CHDM-H12MDI. The modulus (in the rubber state) can be varied between 0.4 to 20 MPa by controlling the level of crosslinking through the amount of TMPAE and amount and type of polythiol. The SMPUs are said to be especially useful for biomedical applications.
Reaction scheme of the invention
Posted by Gerhard Bleys on August 12, 2016
https://purpatents.com/2016/08/12/highly-tuneable-shape-memory-polyurethanes/
Innovation in Polyurethanes 