Cyclized rubber- rubber treated with acid, lost elasticity. Readily soluble in aliphatic or aromatic hydrocarbons, and esters. Compatible with drying oils, resinates, cellulose derivatives, hydrocarbon resins, maleics, modified phenolics. Litho inks, in combination with isophtalic alkyd. Polymerization in bulk, in solutions, suspension, emulsion using variety of catalysts.
Softening points vary depending on chemical formula, molecular weight.
Frequently copolymerised with other monomers. Many viscosity grades commercially available. High molecular weights- tough films. Soluble in many solvents, except aliphatic hydrocarbons. Compatibility with other resins not good, partially compatible with nitrocellulose, phenolic resins, chlorinated rubber.