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