Acetal Copolymer/Celanese

Darvan Vinylidene cyanide-vinyl acetate copolymer Celanese... 

Designing with Celcon acetal copolymer. Celanese 2007. 

Bulletin CIB/Glass-Coupled Celcon Acetal Copolymer, Celanese Corporation, Chatham, NJ, July 1974. 

TABLE 1.3 ACETAL COPOLYMERS-CELANESE PLASTICS (continued)... 

Polyacetals prepared from formaldehyde are engineering thermoplastics, which have found use in traditional metal applications. Some trade names of these polymers are Delrin acetal homopolymer (DuPont) Celcon acetal copolymer (Celanese/Hoechst) Duracon acetal copolymer (Celanese and Diacel—joint venture) Tenac acetal homopolymer by Asahi Chemical in Japan and Ultraform acetal copolymer jointly by BASF and Degussa, in Germany. The polymers have the basic structure shown below ... 

Throughout the remainder of this article the term homopolymer refers to Delrin acetal resin manufactured and sold by Du Pont the term copolymer refers to Celcon acetal copolymer resins (registered trademark of Hoechst Celanese Corporation). 

The polymer also can be made from trioxane (the trimer of formaldehyde), usually as a copolymer with ethylene oxide. The —CH2CH2— fragments in the copolymer chain prevent depolymerization acetal copolymer was developed by Celanese (10). 

CEECON Acetal Copolymer Properties, Brochure 10M, Celanese Corp., New York, June 1983. 

The 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 in Germany (Hostaform). In 1963 Celanese also combined with the Dainippon Celluloid Company of Osaka, Japan and Imperial Chemical Industries to produce acetal copolymers in Japan and Britain respectively under the trade names Duracon and Alkon (later changed to Kematal). In the early 1970s Ultraform GmbH (a joint venture of BASF and Degussa) introduced a copolymer under the name Ultraform and the Japanese company Asahi Chemical a homopolymer under the name Tenal. 

For example, Celanese announced Celcon acetal copolymer in February 1961. By the last half of 1962 and the first half of 1963 we carried through on a specific advertising and promotion program which consisted of ... 

Acetal Copolymer (CELCON ) As with DELRIN , this is a highly crystalline polymer with excellent solvent resistance. It is somewhat more amenable to solvent cementing than the homopolymer, however. The solvent cement recommended by the manufacturer, Hoechst Celanese, is hexafluoroacetone sesquihydrate, available from Allied Signal, Inc. This solvent is a severe eye and skin irritant, however, and should be handled with care (7). 

Celanese Plastics Co., Chatham, NJ, The CELCON Acetal Copolymer Design Manual, (undated). 

Hostaform. [Hoechst Celanese Hoechst UK] Acetal copolymer resins, some glass or mineral ffiled for inj. molding, low-friction tqtplics. 

Cekon . [Hoedist Celanese/Engineer-ing Plastics Hoechst UK] Acetal copolymers, stnne glass, mineral, or carbon-filled lubricated thermoplastic mtgineering lestn used for automotive and industrial applies., antistatic iq lks. 

The most notable development in small appliances has been that of the electric kettle. Nearly all new kettle bodies, lids, and spouts are molded from plastics such as Kematal acetal copolymer of Celanese Corporation. Kematal is chosen for its strength, resilience to impact, smooth surface finish, and wide colorability. Use of the material has also enabled a slimmer design of kettle, suited to the needs of the consumer. 

Polyacetal can be divided into two basic types, acetal homoploymer and acetal copolymer. Both homopolymer and copolymer are available in a range of molecular weights (M = 20 000-100 000). The homopolymer is a polymer of formaldehyde with a molecular structure of repeated oxymethylene units (Staudinger, 1932). Large-scale production of polyformaldehyde, i.e. polyacetal, commenced in 1958 in the USA (US Patent 2 768 994,1956) (British patent 770 717,1957). Delrin (1959) was the first trade mark for this polymer by Du Pont Company. The copolymers were introduced by the Celanese Corporation of America, and the first commercial product named Celcon (1960). One of the major advantages of copolymerization is to stabilize polyacetal because the homopolymer tends to depolymerize and eliminate formaldehyde. The most important stabilization method is structural modification of the polymer by, for example, copolymerization with cyclic ether. 

Celanese Corp., Ticona Engineering Polymers, Celcon Acetal Copolymer Literatnre, www.Ticona.com, 2006. 

Figure 3.27 Stress vs. strain for Celanese Celcon M25—high moiecuiar weight, high toughness, high impact acetal copolymer resin.

Figure 3.35 Stress vs. strain plot for 25% glass-reinforced grade of Celanese Celcon acetal copolymer (ISO 527) [3].

Figure 3.38 Flexural modulus vs. temperature for Celanese Celcon M25/M90/M270 acetal copolymer resins.

Figure 3.40 Shear modulus vs. temperature for Celanese Hostaform acetal copolymer resins with different amounts of glass fiber reinforcement.

Figure 3.49 Typical normalized Celanese Celcon acetal copolymer DMA plot [3].

---