More Isocyanate-Free Polyurethanes

Title: FUNCTIONAL POLYURETHANE PREPOLYMER, METHOD OF PREPARING POLYURETHANE BY USING THE SAME, AND APPLICATION METHOD THEREOF

Number/Link: US2013004677

Applicant/Assignee: AMKANG UNIVERSITY (TAIWAN)

Publication date: 3-01-2013

“Gist”: Bis(cyclic carbonate) compounds are produced by reacting bisphenol-A diglycidylether with CO2. These are then reacted with diamine oligomers (EO-PO and/or PDMS) to produce amine ended β-hydroxy-PU prepolymers which in turn are capped with acrylates to make a UV curable system useful for coating fabrics.

Why it is interesting: The materials are produced without “toxic” isocyanates and “harmful” phosgene (sic), but still need “harmful” amines and solvents. If made solvent-free, however, systems like this could make a lot of sense in e.g. synthetic leather production (IMHO).

Isocyanate-free PU from BPA-based cyclic carbonates and amines

Insulating Polyurethane Foams Containing Impregnated Aerogel Particles

Title: METHOD FOR MAKING ORGANIC FOAM COMPOSITES CONTAINING AEROGEL PARTICLES

Number/Link: WO2013000861

Applicant/Assignee: Dow

Publication date: 3-01-2013

“Gist”: Polyurethane or polyisocyanurate (or -less preferred- extruded foams like EPS foams) are produced in the presence of aerogel particles impregnated with blowing agents resulting in composite foams with exceptional insulation properties.

Why it is interesting: The blowing agent evaporates during the reaction (or extrusion),expands the foam and prevents the aerogel particles of losing their porosity and low density. Already 0.1% w/w of the particles is claimed to have a significant impact on insulation properties. In the examples an HFC blowing agent is used together with aerogel particles with an average size of about 1mm.
It appears that composites of aerogels together with PU or PIR, but also with PS and rockwool e.g. are becoming an ever more important trend in insulation.

Aerogel (Wikipedia)

Self-Healing Polyurethanes, Polyureas and Polyimides

Title: SELF-HEALING POLYMER MATERIALS FOR WIRE INSULATION, POLYIMIDES, FLAT SURFACES, AND INFLATABLE STRUCTURES

Number/Link: WO2012174325

Applicant/Assignee: NASA

Publication date: 20-12-2012

“Gist”: A low molecular weight polyurethane or polyurea material, prepared by reacting IPDI and a polysiloxane diol or diamine in such a way that it flows at about 23°C, shows self-healing properties. Other ’embodiments’ of the invention are concerned with self-healing polyimides containing microcapsules comprising polyimide oligomers (“polyamic acid”).

Why it is interesting: Films of the self-healing PU with a thickness up to 5mm will flow together again after being cut. The material can be laminated between 2 structural layers and used for cable and wire encapsulation e.g.
This is an interesting but very confusing and hard-to-read patent application describing at least 2 different inventions (“non-unity”) and one would expect it to be split-up.

Self-Healing Polymer Film

Innovation in Polyurethanes

More Isocyanate-Free Polyurethanes

Insulating Polyurethane Foams Containing Impregnated Aerogel Particles

Self-Healing Polyurethanes, Polyureas and Polyimides

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