<P> Cardanol is a phenolic lipid obtained from anacardic acid, the main component of cashew nutshell liquid (CNSL), a byproduct of cashew nut processing . Cardanol finds use in the chemical industry in resins, coatings, frictional materials, and surfactants used as pigment dispersants for water - based inks . It is used to make phenalkamines, which are used as curing agents for the durable epoxy coatings used on concrete floors . The name of the substance is derived by contraction from the genus Anacardium, which includes the cashew tree, Anacardium occidentale . The name of the genus itself is based on the Greek word for heart . </P> <P> Friction particles are made by polymerizing the unsaturated side chain of cardanol, followed by cross-polymerization with formaldehyde to yield a cardanol - formaldehyde resin by a process analogous to the formation of phenol - formaldehyde resins such as Bakelite . Cardanol - phenol resins were developed in the 1920s by Mortimer T. Harvey, then a student at Columbia University . These resins found use in vehicle brakes after it was found that they had a coefficient of friction that was less sensitive to temperature changes than phenol - formaldehyde resins . </P> <P> Recently, cardanol has been used as a renewable source in the preparation microcapsules for encapsulation of karanja oil as a bio-based core . </P> <P> Despite all these uses, only a fraction of the cardanol obtained from cashew nut processing is used in the industrial field . Therefore, there is still interest in developing new applications, such as new polymers . </P>

Describe industrially the unit process of cashew cardanol shell