Synthetic resins and their raw materials / A survey of the types and uses of synthetic resins, the organization of the industry, and the trade in resins and raw materials, with particular references to factors essential to tariff consideration. Under the general provisions of section 332, title III, part II, Tariff act of 1930.

by United States Tariff Commission

Imports through the New York Customs District, according to invoice analyses made by the Tariff Commission, are shown in table [90]. Thiourea is dutiable at 25 percent under paragraph 5 of the act of 1930.

Table 90.—Thiourea: United States imports through the New York Customs District, 1931-37

Year	Quantity (pounds)	Value	Unit value	Source
1931	81,560	$24,254	$0.297	Germany and Switzerland.
1932	19,347	4,760	.246	Germany.
1933
1934	15,738	5,982	.380	Do.
1935	29,480	10,500	.356	Do.
1936	81,031	19,782	.244	Do.
1937	(1)

¹ Not available.

Source: Invoice analyses of paragraph 5, of Tariff Act of 1930. Compiled by U. S. Tariff Commission.

19. RAW MATERIALS FOR VINYL RESINS

Vinyl resins are made chiefly from vinyl acetate and vinyl chloride.

Description and uses.

Vinyl acetate is an unsaturated ester of the hypothetical vinyl alcohol. It is made from acetylene and acetic acid, and is a colorless liquid with a pleasant sweetish odor, boiling at 73° C. On account of its tendency to polymerize to polyvinyl acetate, a trace of copper salt is added for shipment. To render the vinyl acetate chemically active again, the copper salt is removed by distillation. At present the sole use of vinyl acetate is for the manufacture of synthetic resins. (See pp. [43-50].)

Vinyl chloride, a salt of vinyl alcohol, is obtained commercially from acetylene. It is a gas (boiling at about minus 14° C.) used in the manufacture of synthetic resins. Vinyl chloride mixed with vinyl acetate is polymerized to a synthetic resin.