Cashew nut shell liquid based polymer resin for making air- drying varnishes

Abstract

As cashew nut shell liquid (CNSL) is a natural source of phenols, attempts are made in this work to prepare a synthetic polymer resin from the liquid, by treating it with formaldehyde. The polymer resin thus prepared is then assessed for its efficiency as a film -former in air- drying varnish formulations. For the assessment, the resin is compared with the commonly used air - drying varnish film - former, short oil soya alkyd resin (60% solids content). The studies reveal that the CNSL - based resin prepared in this work is most applicable as an extender resin rather than a sole resin in air drying varnish formulations.