Formaldehyde Hoechst

Hoechst Celaaese formaldehyde, acetaldehyde, propioaaldehyde, butyraldehyde... 

BMSF Formaldehyde Product Bulletin, Hoechst-Celanese Corp., Dallas, Tex., June 1988. 

Formaldehyde. Pure formaldehyde, CH2O, is a colorless, pungent smelling reactive gas (see Formaldehyde). The commercial product is handled either as soHd polymer, paraformaldehyde (13), or in aqueous or alcohoHc solutions. Marketed under the trade name Formcel, solutions in methanol, / -butanol, and isobutyl alcohol, made by Hoechst-Celanese, are widely used for making alcohol-modified urea and melamine resins for surface coatings and treating textiles. 

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. 

FRG Hoechst Hostaset VF Based on urea-formaldehyde resin and cellulose filler processable by moulding and injection moulding... 

Sulfonic acid formaldehyde condensation product SOLEGAL American Hoechst... 

Madurh. hoechst Celanese/Fine Chem.] Melamine-formaldehyde resins for laminates. 

Another variant of this HCN addition to polar C=X bonds is the Strecker synthesis of aminonitriles from ketones or aldehydes, HCN, and ammonia [Eq. (4)] [8]. A number of patents to Distler and co-workers at BASF do teach the use of aqueous media to facilitate isolation of pure products [9], and researchers at Grace [10], Stauffer [11], Mitsui [12], and Hoechst [13] have reportedly used aqueous media to control the rates of formaldehyde aminohydrocyanation to isolate intermediate addition products in good yields. The use of aqueous media has also proven advantageous when amides, rather than nitriles, are the desired products. 

If formaldehyde is copolymerized with a second monomer, which is a cyclic either such as ethylene oxide and 1,3-dioxolane, end-group capping is not necessary. The copolymerization results in occasional incorporation of molecules containing two successive methylene groups, whereby the tendency of the molecules to unzip is markedly reduced. This principle is made use of in the commercial products marketed as Celcon (Celanese), Hostaform (Farbwerke Hoechst), and Duracon (Polyplastic). 

The chemistry and uses of formaldehyde has been described [1]. Formaldehyde is sold as aqueous solutions which contain minor amounts of methanol. Water-free solutions of formaldehyde dissolved in alcohols like methanol or n-butanol are also available from Hoechst Celanese as Formcel solutions. 

Melamine-formaldehyde resin modifier W. Germany 1,910,472 1970 Farbenwerke Hoechst... 

Polyacetals were among the first synthetic polymers studied by Staudinger in the 1920s. Polyformaldehydes prepared by both anionic polymerization of formaldehyde and cationic polymerization of TOX were, however, thermally unstable. Thus, they were not commercialized until the late 1950s when the reasons for the thermal instability were better imder-stood and the stabilization methods were developed. The DuPont process, based on anionic formaldehyde polymerization, involves esterification of unstable hemiacetal end groups from which degradation starts, while in the Celanese-Hoechst process TOX is copolymerized with a few percent of... 

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 ... 

---