By a new technique, Buca A clay has been successfully incorporated into GR-S latex. Specially designed equipment has adapted this process to the standard GR-S plant. A highly concentrated latex-clay mixture allows good retention of the pigment after coagulation with hydrochloric acid. A small amount of sodium hydroxide permits the preparation of a high-solids clay slurry. Based on gravimetric principles, the plant proportioning equipment has eliminated serious measuring difficulties and resulted in excellent uniformity of pigment loading.Physical properties are superior to those of a mill-mixed master batch at equivalent polymer plasticity. Improved
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