||methacrylic acid n-butyl ester
n-Butyl methacrylate is a colorless liquid with an unpleasant odor. It is readily soluble in acetone, diethyl ether, benzene and most organic solvents; almost insoluble in water. Chemical properties of butyl methacrylate are determined by two key functions in molecule: double bond and ester group. BMA can be easily saponified in alkali medium or interesterificated in the presence of mineral acid and alcohol. It can be polymerized both by free radical and anion mechanism to form homopolymers or copolymers in the presence of other monomers. n-Butyl methacrylate undergoes spontaneous polymerization upon storage on air and light. To prevent it commercial product is inhibited with hydroquinone methyl ether (MEHQ).
n-Butyl methacrylate is manufactured:
by esterification of methacrylic acid with the excess of normal butyl alcohol. This reaction is catalized by sulfuric acid, p-toluenesulfonic acid or ion-exchange resins;
by interesterification of methyl methacrylate with n-butanol in the presence of sulfuric acid;
in an acetone cyanohydrin (ACH) route with ammonium bisulfate as by-products:
as a monomer and comonomer in manufacturing polybutylmethacrylates and a number of copolymers;
in making adhesives, oil additives, dental products, coatings, leather and paper finishing, textile emulsions;