Sodium Chloride → Vinyl acetate sodium acrylate

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A (vinyl acetate-sodium acrylate) copolymer water-in-oil emulsion was prepared according to the following procedures: An aqueous solution was prepared by mixing, under cooling conditions, 96.49 gm of acrylic acid, 163.75 gm of water, 130 gm of a 40 percent sodium hydroxide solution and 0.02 gm of ethylenediamine tetraacetic acid. Separately, an oil solution was prepared by mixing 5.8 gm of Span-80, 113.3 gm of Isopar-M and 6.5 gm of vinyl acetate. The two solutions were combined in a high speed waring blender to give a uniform emulsion. A catalyst solution was prepared by dissolving 0.26 gm of 2,2'-azobis(isobutyronitrile) in 3.13 ml of acetone. The monomer emulsion was then deoxygenated as described in Example 1. The polymerization was carried out in the manner as in Example 1, except that a one-liter pyrex glass reactor equipped as described in Example 1, was used. The product produced was a milky white emulsion containing about 24 percent by weight of the polymer. The polymer had an intrinsic viscosity of 4.2 dl/gm as measured in a one normal aqueous sodium chloride solution.

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