Non-isocyanate polyurethanes from bio-based polyols
AssigneeClemson University Research Foundation
InventorsSrikanth Pilla, James Scott Sternberg
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Abstract
Bio-based polymer precursors and non-isocyanate polyurethanes (NIPU) and non-isocyanate polyurethane foams (NIPUF) that can be formed from the precursors, as well as methods for the synthesis of the precursors and the polyurethane products are described. The bio-based polymer precursors are formed through functionalization of a bio-based polyol, e.g., lignin, with cyclic carbonates. The bio-based polyol starting materials need not be pre-processed and can include Kraft lignin. NIPU/NIPUF can be synthesized through a ring opening curing reaction of cyclic carbonates of the bio-based polyol precursor with diamines. The carbonates and diamines can include non-toxic bio-based carbonates.
Claims4
A non-isocyanate polyurethane comprising the reaction product of a bio-based precursor and a diamine, the bio-based precursor comprising a functionalized polyol, the polyol comprising a bio-based polyol, the functionalization comprising cyclic carbonate functionality in a concentration of about 1.8 mmol cyclic carbonate per gram polyol or greater, the non-isocyanate polyurethane a bio-based carbon content of about 90% or greater as determined by radiocarbon dating according to ASTM D6866-20.
Dependencies are inferred from the claim text.