Patents

A process for the preparation of aqueous emulsion from cashew nut shelf liquid / cardanol based resins

Chennakkattu Krishna Sadasivan Pillai, Janardanan Nair Devakiamma Sudha, Vadakkethonippurathu Sivankutty Nair Prasad, Padmanabhan Anandan

The present invention relates to a process for the preparation of aqueous emulsion from cashew nut shell liquid/cardanol based resins. As the aqueous emulsion of cashewnut shell liquid /cardanol resins particularly of their applications as adhesives are in the plywood and lamination sectors. The emulsion can substitute phenol-formaldehyde, urea formaldehyde resins used in such industries. The process of the present invention has essentially the following steps: reacting CNSL / cardanol with phosphorus pentoxide at ambient temperature for 4 hrs. under stirring and cooling (the temperature rises due to heat of reaction) it down to 90 °C when cold water is added under stirring followed by the addition of emulsifying agent at room temperature and stirring till emulsification is complete.