A rigid polyurethane foam chip made from industrial scrap was used as a filler for flexible polyurethane foam. Functional groups were introduced into the rigid polyurethane foam chip by the reaction of the foam chip with 2-aminoethanol in the presence of a solvent. TDI-based rigid polyurethane foam chip reacted more readily with 2-aminoethanol than an MDI-based chip. Both TDI-based and MDI-based foam chips showed similar reaction behaviour in a polyether polyol used to prepare flexible polyurethane foam under the same processing conditions, showing that these reactant dispersion mixtures could be used as additives in composite foaming recipes.
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