Stabilizers thermoset polyester

Dual ovenable containers must be able to perform under freezable conditions as well as in both microwave and conventional ovens. Materials commonly used for dual ovenables are temperature-resistant plastics such as crystallized PET (CPET), thermoset polyesters, and polycarbonate. CPET, the dominant material, has a temperature stability up to 232°C. 

Uses Flame retardant for ABS, acrylics, epoxy, nitrite, phenolic, PC, thermoset polyester, PS, PE, PP, PVAc, PVC, PU multifunctional pigment for paints/coatings, providing protection against corrosion, tannin staining, microorganisms, UV light pkg. preservative in latex paints metal stabilizer... 

Chem. Descrip. Rutile titanium dioxide, stabilized with Al, Si, Zr Uses Pigment for coatings, epoxy and thermoset polyester resins, food-contact coatings/paper... 

Chem. Descrip. Aliphatic thermosetting polyester PU in toluene/IPA Uses Base coat for nylon and polyester fabrics Features Superior light stability... 

Chem. Descrip. 2-Flydroxy-4-n-octyloxybenzophenone CAS 1843-05-6 EINECS/ELINCS 217-421-2 Uses Lt. stabilizer, UV absorber for polymers incl. acetals, acrylics, ABS, alkyds, cellulosics, epoxies, PC, thermoplastic and thermoset polyester, polyethylene, PP, PS, SAN, and surface coatings UV absorber for PVC flexible and semirigid applies, such as automotive body side molding, automotive surface coatings costabilizer for polyethylene film in agric. or greenhouse applies. 

Uses UV absorber, light stabilizer for acrylates, alkyd/melamines, PU, thermosetting polyester, coatings Trade Names Sanduvor VSU Powd. 

StaMizer, KgM thermoset polyesters UV-Chek AM 301 stabilizer, li thermoset resins BLS 1328... 

Thermosetting polyester and vinyl ester properties that contribute to automotive applications include dimensional stability, strength, toughness, and high service temperatures. 

The amorphous synthetic silicas, fumed and precipitated, are widely used as thixotropes in thermoset polyester resins and gel coats and in PVC plastisols. They are also used as anti-blocking, anti-slip, anti-plateout and flatting agents. Fine groimd natural silicas find some use in thermosets to improve dimensional stability, thermal conductivity and electrical resistance at low cost. 

In most applications, polyester and vinyl ester resins are used as the matrix materials. Epoxies are also used, although they require longer cure times and do not release easily from the pultrusion dies. Hence, thermosetting resins are most commonly used with pultrusion, although some high-performance thermoplastics such as PEEK and polysulfone can also be accommodated. In addition to the resin, the resin bath may contain a curing agent (initiator, cf. Section 3.3.1.2), colorants, ultraviolet stabilizer, and fire retardant. 

Alkyds are formulated from polyester resins, cross-linking monomers, and fillers of mineral or glass. The unsaturated polyester resins used for thermosetting alkyds are the reaction products of polyfunctional organic alcohols (glycols) and dibasic organic acids. Key properties of alkyds are dimensional stability, colorability, and arc track resistance. Chemical resistance, however, is generally poor. 

Incorporation of modified clays into thermosetting resins, and particularly in epoxy35 or unsaturated polyester resins, in order to improve thermal stability or flame retardancy, has been reported.36 A thermogravimetric study of polyester-clay nanocomposites has shown that addition of nanoclays lowers the decomposition temperature and thermal stability of a standard resin up to 600°C. But, above this temperature, the trend is reversed in a region where a charring residue is formed. Char formation seems not as important as compared with other polymer-clay nanocomposite structures. Nazare et al.37 have studied the combination of APP and ammonium-modified MMT (Cloisite 10A, 15A, 25A, and 30B). The diluent used for polyester resin was methyl methacrylate (MMA). The... 

As a preliminary step in the manufacture of unsaturated polyester thermoset plastic one uses low molecular weight linear polyester (Mr 10,000) obtained by a polycondensation of polyglycols with saturated and unsaturated dicarboxylic acids. The precondensate can then be dissolved and stored in the stabilized comonomer, e.g. styrene, with which it will be crosslinked later. The crosslinking polymerization reaction between the polyester chains and the styrene bridges is initiated with the help of organic peroxides which are added dispersed in plasticizers. The reaction begins at 60-90 °C and then proceeds exothermally. In addition to this a cold hardening reaction can also be carried out. For this reaction cold accelerators are necessary, e.g. tertiary amines or cobalt naphthenate. 

The Arrhenius treatment has been applied to aging studies on rubber (13), to predict the life of a polyester-glass laminate (14), to predict product stability of a thermosetting resin alone and in combination with two additives (15), in permanence tests on paper (16), to multi-component systems in which the principal component is paper (17), and to study the influence of temperature on the relative contributions of the oxygen-independent and oxygen-dependent processes to the total rate of newsprint deterioration (18-20). 

The polymer eomponent, whieh is a thermosetting resin, forms eross-linked bonds between chains of molecules, whieh enhanees the eharacteristic of the produet. Unsaturated polyesters and vinyl esters are primarily used as resin systems. Epoxies are also used in some eases, but the eure eyele is longer. Phenolic resins have gained importanee these days because of their inherent properties, especially in applications that require lower flammability, reduced smoke generation, and higher thermal stability. New resin systems such as... 

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