Formic Acid Blown EPIC Foams

Patent Title: ISOCYANATE-BASED TEMPERATURE-RESISTANT FOAMS WITH HIGH FLAME RESISTANCE

Number/Link: WO2016/131874

Applicant/Assignee: BASF, Covestro

Publication date: 25-08-2016

“Gist”: One shot rigid isocyanate-epoxy foams blown with formic acid

Why it is interesting: This is the first in a series of (at least) 3 patent applications apparently resulting from a cooperation between BASF and Covestro on epoxy-isocyanate (“EPIC”) foams. The other applications are WO2016/131878 and WO2016/131880 published on the same date. More publications may follow.
The current invention is about temperature-resistant foams with reportedly very high mechanical properties prepared form a one-shot system comprising a (pref.) high functional MDI, a (pref.) bisphenol-A or bisphenol-F polyglycidylether, at least one reactive amine catalyst and a blowing agent comprising formic acid. The ratio of iso to epoxy groups is (pref.) 3:1 to 15:1. The resulting materials are post-cured at 200°C. The foams contain no, or very little, urethane or urea groups and are said to be especially useful in laminates a.o. In the examples foams with densities of 25-35 kg/m³ with a thermal conductivity as low as 20 mW/mK are shown.

Bisphenol-F diglycidylether

One Component Polyurea

Patent Title: CYCLIC DYNAMIC POLYUREAS FOR POLYMERIC UREA PROCESSING

Number/Link: WO2016/126756

Applicant/Assignee: University of Illinois

Publication date: 11-08-2016

“Gist”: 1K polyurea coatings from thermoreversible cyclic urea oligomers

Why it is interesting: This application is related to W02016/069582 of the same applicant, discussed before on this blog. In this case the sterically hindered ureas are prepared in solvent and at a relatively low concentration. Under these conditions cyclic oligomers will be formed which can be separated and used as powder coatings, or, together with (e.g.) catalysts, polyols and crosslinkers, as liquid coatings. When heated the rings will open and the coating composition will cure. In an example 1,3-bis(isocyanatomethyl)cyclohexane is reacted with N,N’-di-t-butyl ethylenediamine, in DMF, which forms cyclic oligomers at low-, and linear polymers at high concentrations.

Thermoreversible polyurea according to the invention

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

Innovation in Polyurethanes

Formic Acid Blown EPIC Foams

One Component Polyurea

Highly Tuneable Shape Memory Polyurethanes

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