Polyurethane resins
Polyurethanes result from the reaction of a poly alcohol and an organic di-isocyanate.
They can be used as surface coatings, to make furniture and footwear and in foam form,
for packaging.
Polyamide-epichlorohydrin resins
These are formed in two steps. The first step involves reacting a polyfunctional amine
with a diprotic acid to form a polyaminoamide resin. This is then crosslinked with an
epichlorohydrin monomer. The resultant resin is used to coat paper fibres, increasing the
strength of the wet paper from less than 2% to around 30% of its dry strength.
Formaldehyde resins
Formaldehyde resins are made by reacting formaldehyde with any of a variety of
substances such as urea and phenol The reagents are mixed to form a thermosetting crosslinked
polymer used in reconstituted wood (e.g. plywood) and timber adhesives.