553. Ammonium Stearate

Nomenclature

CAS number: 1002-89-7
Octadecanoic acid ammonium salt (1:1); stearic acid ammonium salt.
C18H39NO2; mol wt 301.51.
C 71.70%, H 13.04%, N 4.65%, O 10.61%.

Description and references

Prepn from stearic acid and excess 28-30% NH3 soln: Stumpf, Am. Paint J. 38, No. 45, 60, 64, 68 (1954), C.A. 48, 12428b (1954); from stearic acid and ammonium carbonate: Reiling, US 3053867 (1962 to Boston Chem. Prod.).

Chemical structure

Properties

Yellow-white powder, softens at 35-40°F, mp 70-75°F. At 80°F: sol in methanol, ethanol; slightly sol in water, benzene, xylene, naphtha; practically insol in acetone, CCl4. Sol in water at 212°F, acetone at 134°F, ethanol at 172°F, methanol at 148°F, benzene at 176°F, CCl4 at 170°F, xylene at 180°F, naphtha at 160°F.

Use

In vanishing creams, in waterproofing cements.