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Polyoxymethylene acetal copolymer

Polyoxymethylene (acetal copolymer)/thermoplastic polyurethane in the case of S series, POM/TPU... [Pg.69]

Polyoxymethylene (acetal copolymer)/Hostaflon (PTFE) in the case of C 9021 TF grade, POM/PTFE... [Pg.69]

Type Ultra-bigh molacular weight siloxane polymer dispersed in polyoxymethylene (acetal) copolymer Physical Form Solid pellets... [Pg.195]

Dow Coming HB40-00S Masterbatch is a pelletized formulation containing 40 percent of an ultra-high molecular weight siloxane polymer dispersed in polyoxymethylene (acetal) copolymer. It is designed to be used as an additive in most acetal-co patible systems to impart benefits such as processing ia rovements and modification of surface characteristics. [Pg.195]

Organic Resin Polyoxymethylene (acetal) copolymer, HI 27 Suggested Use Levels, Percent 0.2 to 10 (0.1 to 5% siloxane)... [Pg.195]

Polyoxymethylene -Copolymer Acetal- Copolymer POMC 1.41 HB 15 Poor Poor 0.6-0.8 0.2-0,25... [Pg.78]

ALTERNATIVE NAMES, TRADE NAMES Polyacetal, polyoxymethylene, acetal, Delrin , Celcon (copwlymer), Ultraform (copolymer)... [Pg.650]

CE cellulosics EVA ethylene-vinyl acetate copolymers PA polyamides PES polyesters PO polyolefins POM polyoxymethylenes PUR polyurethanes, polyols RU rubber PS polystyrenes PVC poly(vinyl chloride). [Pg.631]

Polyoxymethylene (Acetal) Acetal resins are derived primarily from formaldehyde although copolymers are common. Endcapping is done to reduce the rate of d rada-tion. These polymers are strong, tough, and stiff, and they have a low coefficient of friction against many materials. They are creep resistant and are extremely resistant to... [Pg.865]

Acetal homopolymer is a highly crystalline thermoplastic manufactured by polymerization of formaldehyde and capping the two ends of the polymer chain with acetate groups (Table 6.2). It is called polyoxymethylene (POM) and has a backbone consisted of repeating —CH2O—units. Acetal copolymers are produced by copolymerization of trioxane and small amounts of a comonomer. The comonomer randomly distributes carbon—carbon bonds in the polymer chain, which stabilizes the resin against environmental degradation. The low cost of acetals compared to other polymers with similar performance and their mechanical, chemical, and electrical properties, allows them to replace metal and other structural materials in many applications. [Pg.168]

Polyoxymethylene Ionomers. Ionic copolymers have been prepared from trioxane and epichlorohydrin, followed by reaction with disodium thioglycolate (76). The ionic forces in these materials disrupt crystalline order and increase melt viscosity (see Acetal resins). [Pg.409]

Acetal resin is a general term used for high molecular weight polymers and copolymers derived from formaldehyde. The name of polyoxymethylene conforms better with the structure of the repeat unit (—OCH2—) . In... [Pg.726]

The polyoxymethylenes are presently widely used in different areas. Approximatively one-third of the market is represented by homopolymers and two-thirds by copolymers. Homopolymers are produced by anionic polymerization of formaldehyde using amines, alkoxides, and other types of anionic initiators. The details of these polymerizations will not be discussed in this paper, although some of their properties will be compared to those of copolymers which are obtained by cationic copolymerization of trioxane with cyclic ethers or cyclic esters. Comprehensive reviews on general aspects of synthesis and properties of acetal resins are available [158-162],... [Pg.727]

The many commercially attractive properties of acetal resins are due in large part to the inherent high crystallinity of the base polymers. Values reported for percentage crystallinity (x ray, density) range from 60 to 77%. The lower values are typical of copolymer. Polyoxymethylene most commonly crystallizes in a hexagonal unit cell (9) with the polymer chains in a 9/5 helix (10,11). An orthorhombic unit cell has also been reported (9). The oxyethylene units in copolymers of tiioxane and ethylene oxide can be incorporated in the crystal lattice (12). The nominal value of the melting point of homopolymer is 17S°C, that of the copolymer is 165°C. Other thermal properties, which depend substantially on the crystallization or melting of the polymer, are listed in Table 1. See also reference 13. [Pg.56]

Polyoxymethylene polymers, POM, commonly known as polyacetals or Acetal resins are linear thermoplastic polymers containing predominantly the -CH -O- repeat unit in their backbone. There are two types of acetal resins available commercially (1) homopolymers made by the polymerization of formaldehyde, followed by endcapping, (2) copolymers derived from the ring opening polymerization of trioxane (a cyclic trimer of formaldehyde), and a small amount of a comonomer such as ethylene oxide. Acetal resins are... [Pg.1092]

Synonyms Acetal resin Polyacetal Polyacetal copolymer Polyacetal resin Polyformaldehyde Polyoxymethylene copolymer POM... [Pg.23]

See other pages where Polyoxymethylene acetal copolymer is mentioned: [Pg.40]    [Pg.46]    [Pg.336]    [Pg.40]    [Pg.46]    [Pg.336]    [Pg.220]    [Pg.1301]    [Pg.3536]    [Pg.91]    [Pg.733]    [Pg.10]    [Pg.11]    [Pg.623]    [Pg.619]    [Pg.33]    [Pg.13]    [Pg.111]    [Pg.261]    [Pg.8]    [Pg.598]    [Pg.87]    [Pg.174]    [Pg.729]    [Pg.730]    [Pg.108]    [Pg.83]    [Pg.103]    [Pg.325]    [Pg.8]    [Pg.461]   
See also in sourсe #XX -- [ Pg.40 , Pg.54 , Pg.58 ]



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