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Cure Characteristics of Cardanol-Formaldehyde Novolac Resins in the Presence of Metallic Driers

SpecialChem / PCI Magazine – Oct 1, 2008

Most phenolic resins1-4 are prepared by reacting formaldehyde with phenols, which are considered to be toxic and harmful for the environment. Now, with increasing concern for environmental protection and, due to stringent regulations to ensure the same, it has become a must for industry to find eco-friendly substitutes for all harmful materials like phenols and VOCs present in organic coating compositions. The technological developments are, therefore, focused on reducing VOCs from the coatings to meet industrial requirements. To this end, the use of cardanol, obtained from Cashew Nut Shell Liquid (CNSL), as an eco-friendly substitute for phenols is gaining importance due to the decline in supply and price fluctuation in phenolic raw materials. The use of cardanol,5,6 a constituent of CNSL, in place of ordinary phenol in the preparation of novolacs can achieve an important industrial goal.he CNSL, obtained from the cashew tree nuts (Anacardium occidentale), is indigenously available in India.

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