Acetal Homopolymer/DuPont

Delrin ST, Tough acetal homopolymer, DuPont Engineering Polymers... [Pg.901]

The lecturers on Polyphenlene Sulfide (Phillips) Aromatic Polycarbonate (GE), Acetal Homopolymers (DuPont), PBT (Celanese), PET (DuPont), Polysulfone and Polyarylate (UCC),... [Pg.10]

Darvan Dispersing agents, Vanderbilt Dechlorane Plus Fire-retardant additive. Occidental D.E.H. Epoxy catalyst resins, Dow Delrin Acetal resin, DuPont Delrin ST Tough acetal homopolymer, DuPont D.E.N. Epoxy novolac resins, Dow Derakane Epoxy vinyl ester resins, Dow... [Pg.549]

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 ... [Pg.252]

Acetal (homopolymer) Acetone 1. Abrasion. Sand with 280-grit emery cloth followed by solvent degreasing. 2. Satinizing technique. Immerse the part in the following for 5-30 s at 80-120°C Perchloroethylene 96.85 1,4 Dioxane 3.0 /7-Toluenesulfonic acid 0.05 Cab-o-Sil (Cabot Corp.) 0.10 Transfer the part immediately to an oven at 120°C for 1 min. Wash in hot water. Dry in air at 120°C. For general-purpose bonding For maximum bond strength. Recommended by DuPont... [Pg.500]

Acetal translucent crystalline polymer is one of the stiffest TPs available. It provides excellent hardness and heat resistance, even in the presence of solvents and alkalies. Its low moisture sensitivity and good electrical properties permit direct competition with die-cast metal in a variety of applications. In addition, acetal has extremely high creep resistance and low permeability. Acetal is also available as a copolymer (Hoechst Celanese Corp. s Celcon) for improved processability. The homopolymer (DuPont s Delrin) has a very low coefficient of friction and its resistance to abrasion is second only to nylon 6/6. Acetals are frequently blended with fibers such as glass or fluorocarbon to enhance stiffness and friction properties. Acetal is not particularly weather-resistant, but grades are available with UV stabilizers for improved outdoor performance. Acetal, whether homopolymer or copolymer, is not used to any significant degree in forming structural foams. [Pg.350]

Tables 3.1—3.5 describe the compositions and designed purpose for the DuPont Delrin acetal homopolymers resins discussed in the rest of this section. The data for acetal homopolymer are found in Tables 3.6—3.15 and Figures 3.2—3.24.

Acetal homopolymer (Delrin ) is a highly crystalline polymer (Du Pont Company, www2.dupont. com) that has excellent solvent resistance. The chemical structure and solvent resistance of homopolymer acetal lead to a relatively poor adhesion of solvent-based paints and cements. This is largely... [Pg.109]

There are two main types of acetal homopolymer and copolymer. The homopolymer version was invented by DuPont in the 1950s, with the trademark name of Delrin . The copolymer version came later, under the brand names Celcon , Hostaform , Ultraform , and Duracon . The distinctions between these two versions are subtle ... [Pg.110]

The DuPont route for polyacetal (shown in Figure 3.7) yields a homopolymer through the condensation reaction of polyformaldehyde and acetic acid (or acetic anhydride). Termination can be achieved by coupling or disproportionation [13], Termination can be thought of as the disappearance of an active center [13], Figures 3.8 and 3.9 show disproportionation and coupling, respectively. The two active centers will combine in the case of coupling, while termination via disproportionation leaves a double bond on one of the chain ends as the reaction will simply end. [Pg.40]

There are two basic types of acetals. DuPont produces the homopolymers whereas Celanese produces the copolymers. [Pg.143]

Acetal polymers are formed from the polymerization of formaldehyde. They are also known by the name polyoxymethylenes (POM). Polymers prepared from formaldehyde were studied by Staudinger in the 1920s, but thermally stable materials were not introduced until the 1950s when DuPont developed Delrin. Homopolymers are prepared from very pure formaldehyde by anionic polymerization, as shown in Fig. 1.4. Amines and the soluble salts of alkali metals catalyze the reaction. The polymer formed is insoluble and is removed as the reaction proceeds. Thermal degradation of the acetal resin occurs by unzipping with the release of formaldhyde. The thermal stability of the polymer is increased by esterification of the hydroxyl ends with acetic anhydride. An alternative method to improve the thermal stability is copoly-... [Pg.13]

Acetals are produced by Asahi Chemical (homopolymer Tenac, copolymer Tenac-C, and conductive copolymer Lynex-T ), BASF (copolymer Ultraform ), DuPont (homopolymer Delrin ), Mitsubishi Gas Chemical (copolymer lupital ). Polyplastics (copolymer Duracon in Asia) and a joint venture between Ticona and Daicel Chemical Industries, Ticona/Celanese AG (copolymer Celcon and Hostaform in Europe). Mitsubishi Gas Chemical, Polyplastics, and Ticona are (jointly, directly, or through affiliates) increasing acetal production capacity in the Asia/Pacific area, with a new 60,(XX) metric ton/year plant to be completed in 2004 in Nantong, Jiangsu province, north of Shanghai. ... [Pg.597]

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