Hydrochloric Acid → 2-[(2-Methylprop-2-enoyl)oxy]benzoic acid

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Reaction Steps

Sodium methacryloyloxybenzoate is prepared by dissolving 10 grams of methacryloyloxybenzoic acid in 150 mls of an aqueous solution containing 1.94 grams of sodium hydroxide. Twelve mls of 2N NaOH solution is added in order to obtain a clear solution. To this solution maintained at 0°-5° C. under nitrogen, is added 0.15 grams of potassium persulfate in 7 mls of water, followed after one minute by 0.075 grams of sodium bisulfite in 5 mls of water. After the reaction mixture is held at that temperature for 10 hours, the mixture is allowed to rise to room temperature and is stirred for an additional 16 hours. The reaction mixture is acidified with 100 mls of 20% by weight hydrochloric acid to precipitate the polymer. The polymer is filtered, washed with water, boiled in glacial acetic acid and filtered, washed with water, and then dried at 120° C. and a pressure of 0.1 mm Hg to yield 5.7 grams of polymethacryloyloxybenzoic acid with an inherent viscosity of 1.46 dl/g as measured in a 0.2% by weight solution of 2N NaOH at 25° C. The product has a melting point greater than 330° C. The polymer may be utilized in preparing transparent films and fibers.

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