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1. POM manufacturing
In the 1950s, research into the manufacture of high-molar-weight polyformaldehyde was carried out in parallel by the DuPont and Celanese companies in two different ways.
DuPont developed the polymerization of formaldehyde monomer using a tertiary amine initiator in a liquid hydrocarbon. The resulting polymer, which was relatively unstable, was stabilized by modifying the chain ends in an acetic anhydride solution. A patent was taken out in 1956, and DuPont publications described a thermally stable, high-molecular-weight polyoxymethylene (POM) defined as a linear acetal chain structure of unusually high crystallinity. Delrin was marketed in 1960.
Celanese Corporation, for its part, has developed a solution based on the polymerization...
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POM manufacturing
Properties
Bibliography
Standardization
The Afnor catalog can be consulted online: http://www.afnor.fr
- Plastics – Thermomechanical Analysis (TMA) – Part 1: General principles - ISO 11359-1 - 10-99
- Plastics – Thermomechanical Analysis (TMA) – Part 2: Determination of linear thermal coefficient and glass transition temperature - ISO 11359-2 - 10-99
- Plastics –...
Polyacetal producers
Both homopolymers and copolymers are relatively difficult to produce, and have been for a long time. DuPont and Celanese were the only two producers. Numerous new plants have sprung up in the Far East.
Only DuPont and Asahi offer homopolymers. All other producers offer copolymers. Total worldwide capacity is around 780 kt (table
Organizations
United states Pharmacopoeia (USP)
French National Institute for Research and Safety (INRS)
Drug Master Files, Food and Drug Administration (FDA)
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