No abstract

For satisfactory performance in vinyl chloride‐acetate resins, plasticizer must be compatible with the resin in a wide range of concentration. Low volatility low rates of extraction by oil and water, and good chemical stability are necessary in most applications. In special applications good electrical properties, low flammability, preservation of compound flexibility at low temperatures, and freedom from odor and taste are also required. Physical test methods, suitable for the evaluation of plasticizers, are briefly described.

No abstract

A group of 99 materials lias been evaluated as plasticizers in a commercial vinyl chloride-acetate resin. A range of three concentrations of plasticizer was used and the same methods of evaluation were employed as in a previous paper (4). Plasticizing efficiency is shown by elongation at 1000 pounds per square inch at 10°, 25°, and 40°C. Data are also given at these three plasticizer concentrations for volatile loss, oil extraction, water extrac-

oxygen partial pressures below 0.1 atmosphere. The rate of carbon oxidation was found to be directly proportional to the oxygen partial pressure and to the amount of carbon in the reactor.These results may be of interest to those concerned with problems such as the decoking of catalysts, and may be applicable to processes such as the fluidized coking of petroleum residues.