Polymeric coacervate coating for flame retardant paper

Cellulosic paper (from wood fibers) is a highly flammable material that used in corrugated carboard, packaging, printing, and construction. While there significant work focused on depositing flame retardant coating onto the individual pulp fibers, are very few studies apply coatings to already-cast paper. In an effort improve properties of paper, polymer-dense coacervate composed polyethylenimine (PEI) poly(sodium phosphate) (PSP) was deposited single step subsequently crosslinked with glutaraldehyde. vertical test, PEI/PSP coacervate-coated achieves self-extinguishing behavior, average char length 3.4 in, only 35% weight gain. Additionally, retains its after water immersion conditioning tests. This system first polymeric be successfully commercially available cellulosic for purpose retardancy.