In this investigation, NRL was blended with
water borne polyurethane dispersion (PUD)
to produce latex foam rubber with different
densities. NRL is green and sustainable, while
the anionic PUD is produced by the formation
of a polyurethane polymer followed by
incorporation of anionic groups dispersed in
an aqueous medium without the aid of surface
active substances10. PUD is an established
material that has undergone development in
the past few years to widen its product range