Leo Baekeland
Invention of Bakelite

Having been successful with Velox, Baekeland set out to find another promising area for chemical development. As he had done with Velox, he looked for a problem that offered "the best chance for the quickest possible results". Asked why he entered the field of synthetic resins, Baekeland answered that his intention was to make money. By the 1900s, chemists had begun to recognize that many of the natural resins and fibers were polymeric, a term introduced in 1833 by Jöns Jacob Berzelius. Adolf von Baeyer had experimented with phenols and formaldehydes in 1872, particularly Pyrogallol and benzaldehyde. He created a "black guck" which he considered useless and irrelevant to his search for synthetic dyes. Baeyer's student, Werner Kleeberg, experimented with phenol and formaldehyde in 1891, but as Baekeland noted "could not crystallize this mess, nor purify it to constant composition, nor in fact do anything with it once produced".

Baekeland began to investigate the reactions of phenol and formaldehyde. He familiarized himself with previous work and approached the field systematically, carefully controlling and examining the effects of temperature, pressure, and the types and proportions of materials used.

The first application that appeared promising was the development of a synthetic replacement for shellac (made from the secretion of lac beetles). Baekeland produced a soluble phenol-formaldehyde shellac called " Novolak " but concluded that its properties were inferior. It never became a big market success, but is still used to this day (e. g. as a photoresist).

Baekeland continued to explore possible combinations of phenol and formaldehyde, intrigued by the possibility that such materials could be used in molding. By controlling the pressure and temperature applied to phenol and formaldehyde, he produced his dreamed-of hard moldable plastic: Bakelite. Bakelite was made from phenol, then known as carbolic acid, and formaldehyde. The chemical name of Bakelite is polyoxybenzylmethylenglycolanhydride. In compression molding, the resin is generally combined with fillers such as wood or asbestos, before pressing it directly into the final shape of the product. Baekeland's process patent for making insoluble products of phenol and formaldehyde was filed in July 1907, and granted on December 7, 1909. In February 1909, Baekeland officially announced his achievement at a meeting of the New York section of the American Chemical Society.

In 1917, Baekeland became a professor by special appointment at Columbia University.

The Smithsonian has documents from the county courthouse for Westchester County in White Plains, New York, indicating that he was admitted to U. S. Citizenship on December 16, 1919.

In 1922, after patent litigation favorable to Baekeland, the General Bakelite Co., which he had founded in 1910, along with the Condensite Co. founded by Aylesworth, and the Redmanol Chemical Products Company founded by Lawrence V. Redman, were merged into the Bakelite Corporation.

The invention of Bakelite marks the beginning of the age of plastics. Bakelite was the first plastic invented that retained its shape after being heated. Radios, telephones and electrical insulators were made of Bakelite because of its excellent electrical insulation and heat-resistance. Soon, its applications spread to most branches of industry.

Baekeland received many awards and honors, both during his lifetime and beyond, including the Perkin Medal in 1916 and the Franklin Medal in 1940. In 1974 he was posthumously inducted into the Plastics Hall of Fame and in 1978 he was likewise inducted into the National Inventors Hall of Fame in Akron, Ohio.

At the time of Baekeland's death in 1944, the world production of Bakelite was ca. 175,000 tons, and it was used in over 15,000 different products. He held more than 100 patents, including processes for the separation of copper and cadmium, and for the impregnation of wood.
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