Thermoplastics acetal copolymer

This type of adhesive is generally useful in the temperature range where the material is either leathery or mbbery, ie, between the glass-transition temperature and the melt temperature. Hot-melt adhesives are based on thermoplastic polymers that may be compounded or uncompounded ethylene—vinyl acetate copolymers, paraffin waxes, polypropylene, phenoxy resins, styrene—butadiene copolymers, ethylene—ethyl acrylate copolymers, and low, and low density polypropylene are used in the compounded state polyesters, polyamides, and polyurethanes are used in the mosdy uncompounded state. 

Organic peroxides are used in the polymer industry as thermal sources of free radicals. They are used primarily to initiate the polymerisation and copolymerisation of vinyl and diene monomers, eg, ethylene, vinyl chloride, styrene, acryUc acid and esters, methacrylic acid and esters, vinyl acetate, acrylonitrile, and butadiene (see Initiators). They ate also used to cute or cross-link resins, eg, unsaturated polyester—styrene blends, thermoplastics such as polyethylene, elastomers such as ethylene—propylene copolymers and terpolymers and ethylene—vinyl acetate copolymer, and mbbets such as siUcone mbbet and styrene-butadiene mbbet. 

Chattopadhyay, S., Chaki, T.K., Bhowmick, A.K., Gao, G.J.P., and Bandyopadhyay, S., Structural characterization of electron-beam crosslinked thermoplastic elastomeric films from blends of polyethylene and ethylene-vinyl acetate copolymers, J. Appl. Polym. Sci., 81, 1936, 2001. 

Pigment preparations are also marketed for coloring thermoplastic PUR. Their carrier materials range from vinyl chloride or vinyl acetate copolymers, such as are used for PVC, through low-molecular polyethylene to PUR itself. 

The next products developed were the thermoplastics made by vinyl polymerization. Vinyl chloride, and vinyl acetate copolymers known as Vinylite, was one of the first produced by Carbide and Carbon. It had been worked on in Europe and had also been worked on by Ostromysslenski, a chemist with the U. S. Rubber Company. The Carbide chemists realized at an early date that to get a uniform composition it was necessary to adjust the feed ratios of the two monomers to get a proper combination in the reactor to give a constant composition to the product. The next major development of a vinyl product was in the development of Lucite or Plexiglas polymers, which are clear, strong plastics. 

ISO 4613-1 1993 Plastics - Ethylene/vinyl acetate (E/VAC) moulding and extrusion materials - Part 1 Designation and specification ISO 4613-2 1995 Plastics - Ethylene/vinyl acetate (E/VAC) moulding and extrusion materials - Part 2 Preparation of test specimens and determination of properties ISO 8985 1998 Plastics - Ethylene/vinyl acetate copolymer (EVAC) thermoplastics -Determination of vinyl acetate content... 

Figure 1. Relationship between (normalized) tensile strength and HPL content of injection molded blends with ethylene vinyl acetate copolymer. (Vinyl acetate content of the thermoplastic copolymer is given in parentheses.) (Strength values expressed in percent of unblended copolymer.) (From Ref. 11, with permission by Marcel Dekker, Inc.)...

Thermoplastic polyurethanes Acetals copolymers only Thermoplastic rubbers some only Thermoplastic olefins some only Cellulosics only certain dyes... 

Ultrathene [Quantum], TM for a series of ethylenevinyl acetate copolymer resins for adhesives, conversion coatings, and thermoplastic modifiers. Wide range of melt indexes. Improves specific adhesion of hot-melt, solvent-based, and pressure-sensitive adhesives. 

Low profile plastics are added to reduce shrinkage during cure. They are normally thermoplastics that include polyvinyl acetates, polymethyl methacrylate, and copolymers with other acrylate, vinyl chloride-vinyl acetate copolymers, polyurethane, polystyrene, polycaprolactone, cellulose acetate butyrate, saturated polyester, and styrene butadiene copolymers. More details about the low profile additive (LPA) mechanism are published in the literature. ... 

The most widely used thermoplastic polymer is the ethylene—vinyl acetate copolymer, which is obtainable in a wide range of molecular weights as well as in a variety of compositions. Often flexibilizers or plasticizers are added in order to improve both the mechanical shock resistance and the thermal properties of the adhesive. Polybutenes, phthalates, and tricresyl phosphate have been used as plasticizers. Tackifying agents can also be added. Because hot-melt adhesives are frequendy ethylene-based, they are subject to oxidation if, as in a typical situation, the adhesive sits in an applicator for long periods before use. Thus, antioxidants such as hindered phenols are often used, as are fillers. Fillers are added to opacify or to modify the adhesive s flow characteristics, as well as to reduce cost. Wax is also a very important component. Wax alters surface characteristics by decreasing both the liquid adhesive s surface tension and its viscosity in the melt. Upon solidification, however, the wax acts to increase the strength of the adhesive. Both paraffin and microcrystalline wax are used (see Waxes). 

In both Europe and the United States, aluminum trihydrate, or ATH [Al(OH)3)], has by far the largest share of the mineral flame-retardant market however, magnesium hydroxide presently has the highest growth rate. To date, most of the research using magnesium hydroxide has focused on thermoplastics, including ethylene-vinyl acetate copolymer (EVA), polypropylene, acrylonitrile-butadiene-styrene (ABS) copolymer, and modified polyphenylene oxide (Hornsby and Watson, 1986). 

VdC/EA/MMA teipolymer (latex) Vinyl chloride/vinyl acetate copolymer Vinylidene chloride Vinylidene chloride/vinyl chloride copolymer Formaldehyde Vinyl chloride Epichlorbhydrin Polyvinyl chloride (latex) Polyvinyl chloride (general) Thermoplastic polyurethane Polycarbonate (flame resistant) Polyurethane flexible foam Polycarbonate (general) Polyurethane rigid foam Acrolein MDI Phosgene TDI... 

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. 

Virtually all thermoplastics and some thermoset most common are commodity plastics such as PVC, PE, PP, and PS others include ABS, nylon, cellulosics, acrylics Several thermoplastics with PE (particularly ND, PE) having the largest volume others include PVC, PP, PS, ABS, acrylics, nylons, acrylonitrile, acetates, and PC PE, (highest volume) PP, PVC together account for almost all plastics used others include a number of engineering thermoplastics, including ABS, acetal copolymers, nylon (6 and 11), polycarbonate Almost all thermoplastics but most commonly used include ABS, PP, PS, PVC polyesters others include acrylics, polycarbonate, cellulosic, nitrile resins... 

Vinyl Acetate Copolymers. Copolymerization of vinyl acetate with other monomers allows specific improvement of certain properties. Copolymers generally exhibit a broader compatibility than the homopolymer. For example, softer, permanently flexible polymers with a lower water uptake and higher alkali resistance are obtained by polymerizing vinyl acetate with vinyl laurate. On account of their thermoplastic properties these copolymers are used in heat-sealable finishes on paper, cardboard, and aluminum foil. In cellulose nitrate lacquers they increase adhesion, lightfastness, and the body fullness of the paint film. They can also be used for priming coats and for stabilizing porous or absorbent substrates. 

Physical and thermal properties PVC is thermoplastic. In rigid, unplasticized form, PVC is stiff and brittle. Addition of external plasticizer imparts various levels of softness and flexibility. Copolymerization with flexible monomers also results in a softer product. Vinyl records or LPs comprise vinyl chloride/vinyl acetate copolymer. ... 

Fractional recovered strain vs. reduced time (= recovery time/creep time) for acetal copolymer at 20 °C and 65% humidity. The data from different creep times and stresses do not superimpose (from Thermoplastics and Mechanical Engineering Design, ICI Plastics Division, booklet GI 17). 

The fundamentals of pressure-sensitive hot-melt adhesives are similar to those of solvent-based systems. Most elastomers and tackifiers are suitable, although ethylene-vinyl acetate copolymers are also used and the conventional rubber types are not. Pressure-sensitive hot melts are dominated by thermoplastic rubbers, which are ideal for use in these applications. Their unique properties arise from their essentially two-phase structure, in which thermoplastic regions of styrene end blocks lock the elastomeric midsections of butadiene or isoprene at room temperature but allow the elastomer to move freely at elevated temperatures or in solvent. This gives the polymer properties that are akin to those of vulcanized rubbers at room temperature, while allowinig it to behave as a thermoplastic when heated or dissolved. This structure is illustrated in Fig. 1. 

Trunec has described the thermoplastic extrusion of thin-wall tubes made of yttria-stabilized zirconia and gadolinia-doped ceria [Tru 04], These ceramics are used for solid oxide electrolyte applications, e.g. solid oxide fuel cells. The thermoplastic binder system used consists of ethylene-vinyl acetate copolymer, parafHn wax and stearic acid. With this system tubes with an outer diameter of 10.5 mm and wall thicknesses of 290 and 280 pm could be fabricated. 

Nowadays commercial mixtures of bitumens with uncured synthetic elastomers are produced, e.g. ethylene-propylene-diene terpolymers (EPDM), styrene-butadiene sequence copolymers (SBS), and ethylene-acrylic ester-acrylic acid terpolymers (AECM). Mixtures with some thermoplastics are also commercial products, e.g. polyethylene (PE), ethylene-propylene copolymers (EPM), alpha-olefinic copolymers, atactic polypropylene (aPP), and ethylene-vinyl acetate copolymers (EVA). 

See Polyvinyl chloride Vinyl chloride/vinyl acetate copolymer CAS 9003-22-9 39433-77-7 Synonyms Acetic acid ethenyl ester polymer with chlorethene Acetic acid ethenyl ester, polymer with chloroethene Acetic acid, vinyl ester compd. with chloroethene Acetic acid, vinyl ester, polymer with chloroethylene Chloroethylenevinyl acetate polymer Poly (vinyl chloride-co-vinyl acetate) Polyvinyl chloride/polyvinyl acetate Poly (vinyl chloride-vinyl acetate) PVCA PVC/PVA PVCA/A copolymer VCA/AC Vinyl acetate/vinyl chloride copolymer Vinyl acetate/vinyl chloride polymer Vinyl chloride/vinyl acetate copolymers Vinyl chloride/vinyl acetate polymer Classification Polymer Definition Thermoplastic contg. 5-20% vinyl acetate... 

Acetal copolymer EPDM rubber Polybutylene terephthalate Polycarbonate Polyurethane, thermoplastic... 

Acetal copolymer Nylon 6 Nylon 12 Nylon 66 Polybutylene terephthalate Polyethylene, ultrahigh m.w. high-density Polyurethane elastomer, thermoplastic geiger-counting tubes Argon gel coats... 

Polyetheretherketone thermoplastic, engineering power tools Polyphenylene ether thermoplastic, engineering profiles Polyphenylene ether thermoplastic, engineering sheet Polyphenylene ether thermoplastic, extrusion Acetal copolymer... 

A large mrmber of polymeric materials are involved in a web coating. These include poly-virtylchloride, polyurethanes (thermoplastic and thermoset solvent-based and water-based), natural, nitrile, chloroprene, and ethylene-propylene rabbers, silicones, polyethylene (chlorinated and chlorositifonated), polyamide, polyester, acrylic resins, polyvinylal-cohol, polytetrafluroethylene, and ethylene-vinyl acetate copolymer as the main matrix polymers of coating compositions. Most of these polymers are not plasticized or seldom... 

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