Hollow glass fibres

Abstract

Publisher SummaryThe first commercially available acetal resin was marketed by Du Pont in 1959 under the trade name Delrin, after the equivalent of ten million pounds had been spent in research or polymers of formaldehyde. The Du Pont monopoly was unusually short lived as Celcon, as acetal copolymer produced by the Celanese Corporation became available in small quantities in 1960. This material became commercially available in 1962 and later in the same year Farbwerke Hoechst combined with Celanese to produce similar products. The polyacetals are available modified with glass fiber and may contain fire retardants and some grades are blended. In 1982, Hoechst introduced blends of polyacetals and polyurethanes to give materials of improved toughness yet retaining most of the key features of polyacetals;they have since been followed by other suppliers. Besides being commercially referred to as polyacetal materials, polyformaldehydes are also often known as polyoxymethylenes and are the simplest type of a family of aliphatic polyethers. Of the many other aliphatic polyethers, polythioethers, and polysulphides prepared in the laboratory some have become commercially available.