The active constituent of CNSL is a meta substituted phenol with long
hydrocarbon side chain which on account of its unique molecular structure
imparts to CNSL many useful properties leading to its manifold uses in the
manufacture of oil soluble resins, varnishes and paints, friction dusts and
chemical resistant linings, rubber compounds, bonding resins, adhesives etc.,
For most of the above applications, CNSL has to be partially polymerized to a
thick viscous liquid consistency which generally is a time consuming and
We are preparing Residol, the bodied material from CNSL, through the action of
heat only without using any catalyst. This avoids contamination with other
chemicals which may interfere with its ultimate use.
Residol has the following general characteristics:-
Molecular weight : Between 1000 to 1500
Viscosity at 30C : Between 15000 to 20000 poises
Gel Time : Less than 5 minutes with catalyst.
Iodine value (wijs) : Between 180 to 210
Hydroxyl value : Between 210 to 230
Colour : Dark brown to black
Residol is comparatively a cheap material and can partly or wholly replace
Linseed oil and other drying oils and resins in coating formulations where light
colour is not a consideration. It retains its phenolic character and can be
condensed with Formaldehyde, Hexamine etc. and can be reacted with Styrene
Monomer, Drying oil and Synthetic Resins easily.
The film of Varnishes, Enamels and Paints, Formulated from Residol, dry hard
either under ambient conditions or on baking. Such films have proved to have
high gloss, good hardness and flexibility, resistance to impact, water, dilute
solution of alkalies and acids and common organic solvents.
It is advised that basic Pigments are not ground with Residol based medium.
Such reactive Pigments can be added after the grinding process is almost over
allowing slight grinding for proper dispersion.
Residol is also a very suitable raw material for use in the manufacture of
Chemical Resistant Tiles and Cements, Adhesives, Friction Dust Powder for
making Brake Lining & Clutch Facings etc. Its use with Rubber Compounds
improves their process ability, ageing properties, abrasion resistance to oil and
above all reduces the cost.