GB470397A - Esters of methacrylic acid and their manufacture - Google Patents

Abstract

Methacrylic acid esters of phenols, e.g. phenyl, o-cresyl, resorcinyl, p-cyclohexylphenyl, a - and b -naphthyl and hydroquinyl methacrylates and homologous methacrylates, the mono- and polymethacrylates of the mono-and polyhydric phenols such as resorcinol, catechol, pyrogallol, phloroglucinol, the di- or polyhydroxynaphthols and naphthalenes, thymol, diphenylolpropane and diphenylolnaphthane, are manufactured by reacting a lower ester of methacrylic acid with a phenol in the presence of an ester-interchange catalyst, or by reacting a phenol with a methacrylyl halide. In examples: (1) methacrylyl chloride is heated with o-cresol to produce o-cresyl methacrylate; (2) phenol similarly yields phenyl methacrylate; (3) p-cyclohexylphenol similarly yields p - cyclohexylphenyl methacrylate; (4) resorcinol similarly yields resorcinyl dimethacrylate. Polymerization products are manufactured by polymerizing the esters described above by the processes described in Specifications 465,789 and 467,900, if desired with the addition of the modifying agents ennumerated therein. The polymers, interpolymers, mixed polymers and syrupy partial polymerization products may be employed for the purposes set out in the said Specifications. In examples: (5) phenyl methacrylate is heated in acetone solution with benzoyl peroxide, and the polymer is precipitated by addition of gasoline or other non-solvent for the polymer; the product is moulded to a disc; (6) p-cyclohexylphenyl methacrylate is heated in methanol solution with benzoyl peroxide, and the product is moulded to a disc; (7) resorcinyl dimethacrylate is heated alone to 100 DEG C. Specification 15271/14, [Class 2 (iii)], also is referred to.