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PRESENT AND PROPOSED USES OF PLASTICS IN THE MOTION PICTURE INDUSTRY*
BARTON H. THOMPSON**
Summary. — A general survey of plastics as they apply to the motion picture industry, outlining molding and fabricating problems, basic material make-up, outstanding physical properties, and a general description of some of the actual usages of thermoplastic and thermosetting resins are given. The future of the many plastics is also briefly discussed.
The adoption of plastics within the motion picture industry has been held up to a great degree by the war effort. Prior to the war many applications were made by using a plastic alone or in conjunction with other materials. Although the plastic field is in its infancy ,. with the development of new resins and processes due solely to the war effort, in the future we may expect to accomplish with plastics what has heretofore been considered impossible.
The word "plastic" is too new to have a clear definition. It is understood by many to be an animal or plant resin, or a synthetic organic material composed mainly of a resinous or cellulose derivative binder. Actually, the majority of plastics are made from one or more of the following basic materials: Air, water, -coal, petroleum^ natural gas, limestone, salt, cellulose from wood or cotton, or sulfur.
Plastics are classified as thermoplastic, thermosetting, and element reactive. The element reactive will not be discussed at length in this paper, but it is composed of resins which react to the elements, such as oxidation, and is used in coatings and surface finishes.
Thermoplastics. — These are synthetics except for a few natural resins, such as polyterpene and shellac, the cellulosics and the synthetic organic materials, which can be heated and molded into shape, and can be reheated and remolded from time to time.
* Presented Oct. 18, 1943, at the Technical Conference in Hollywood. ** Research Engineer, Paramount Pictures, Inc., Hollywood.
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