What is claimed is:
1. A polyurethane product comprising a polymerization product of an isocyanate and polyols that comprise a lignin product; wherein the polyurethane product has a higher compressive strength than polyurethane made under same conditions except without the lignin product; and wherein the lignin product is a solid residue from a pretreatment...
This application claims the benefit of U.S. Provisional Application No. 62/396,740, filed Sep. 19, 2016, which application is incorporated herein by reference in its entirety.