Abstract
Resin–rubber gum containing about 40% resin, 35% rubber, and 25% residue insoluble in either acetone or benzene, has been extracted from milkweed leaves by a mechanical method. The extraction method involves cooking leaves in dilute alkali, washing until the pH is reduced to about 9.5, and pebble milling to effect agglomeration. Sodium hydroxide solution (1.5%) boiling at atmospheric pressure has been used with cooking periods of from [Formula: see text] to 3 hr. Gum yields of the order of 8% of the weight of dried leaves have been obtained.Resin–rubber gums also have been obtained by this method from the stalks and seed pod hulls of milkweed. Similar materials have been extracted from a number of other plants.
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