主权项 |
1. A process for recovering rubber from an aqueous non-Hevea natural rubber latex that contains natural rubber, water, extractables, and one or more additives, and is essentially free of lignocellulosic plant material, comprising the steps of:
freezing the latex, whereby at least 75% of the natural rubber coagulates and a mixture containing coagulated natural rubber, water, and extractables is formed; thawing the mixture; collecting the coagulated natural rubber; contacting the coagulated natural rubber with an extraction solution comprising at least one organic polar solvent in order to preferentially solvate the extractables; and drying the coagulated natural rubber to create a resultant natural rubber wherein the resultant natural rubber has an amount of acetone extractables of 5% by weight or less. |