Epichlorohydrin/bisphenol

Taffy Process. Bisphenol A reacts direcdy with epichlorohydrin in the presence of a stoichiometric amount of caustic. The molecular weight of the product is governed by the ratio of epichlorohydrin—bisphenol A. [Pg.366]

Resin type Orthophthalic, isophthalic, low profile, halogenated Epoxy Novolak, methacrylate esters of bisphenol epoxy resins Epichlorohydrin/ bisphenol-A... [Pg.324]

The multifunctionality contributes higher reactivity and cross-link density. These factors are especially critical when formulating systems that require improved thermal performance over conventional epichlorohydrin—bisphenol A systems. The melt viscosity of these resins, which are solids at room temperature, decreases sharply with increasing temperature. This affords the formula tor an excellent tool for controlling flow of molding compounds, and facilitating the incorporation of ECN resins into other epoxies, eg, for powder coatings. [Pg.363]

EPON 1001 60 225 P MeCI (hot) 284 489 406 539 601 Epichlorohydrin-bisphenol A resin average molecular mass = 900 for steroids, pesticides... [Pg.31]

The ratio of the main ingredients used in the synthesis of epoxy resins (epichlorohydrin bisphenol A) determines the extent of the reaction and the molecular weight (or value of n repeating units in the molecular chain). The addition of bisphenol A to the reaction mix will advance the molecular weight of the resin and the value of n. As n increases, the viscosity or melting point of the resin also increases. Also as the value of n increases, the number of hydroxyl groups increases while the number of epoxy groups remains constant. [Pg.28]

Mole ratio epichlorohydrin/ bisphenol A Mole ratio NaOH/ epichlorohydrin Softening point, °C Molecular weight Epoxide equivalent Epoxy groups/ molecule... [Pg.31]

With exactly equal amounts of bisphenol A and epichlorohydrin, this polymerization would continue until the polymer chains were very long and the material would be a solid polymer. In making epoxy resins, however, excess epichlorohydrin is added to form short chains with epichlorohydrins on both ends. More epichlorohydrin gives shorter chains and a runny prepolymer. Less epichlorohydrin gives longer chains (containing up to 25 epichlorohydrin/bisphenol A units) and a more viscous prepolymer. [Pg.657]

Greenlee explored the epichlorohydrin-bisphenol A synthesis route for the production of new resins (without caustic-sensitive ester linkages) for coatings. [Pg.24]

Resins. The epoxy ester was prepared from one of the solid grades of epichlorohydrin/bisphenol-A type resin. The resin was first esterified with benzoic acid to 40% of the available esterifiable groups. The re-... [Pg.150]

The DMA of a epichlorohydrin-bisphenol A epoxy resin cured using BF3-ethylamine is shown in Figure 11.16 (37). [Pg.696]

Synthesis. lj characterization of the graft copolymer has been reported. The Epoxy resin used is a high molecular weight (Mn=10,000) epichlorohydrin-Bisphenol type, and the acrylic is approximaely a 2 1 molar ratio of methacrylic acld/styrene. The Epoxy/acrylic ratio is approximately 80/20 by weight. Grafting is achieved.by.free radical means... [Pg.285]

Molar Ratio Epichlorohydrin/Bisphenol A Molecular Weight Epoxide Equivalent Softening Point (°C)... [Pg.495]

Chem. Descrip. Epichlorohydrin-bisphenol A epoxy resin CAS 25068-38-6... [Pg.245]

Chem. Descrip. Epichlorohydrin-bisphenol A epoxy sol n. resin in xylene Uses Epoxy tor marine/protective coatings Properties Gardner 3 sol n. dens. 9.2 Ib/gal vise. 500-1200 cps flash pt. 23 C EEW 230-250 80% NV D.E.R. 337-X90 [Dow/Epo) Prods. Intermeds.j... [Pg.245]

Resin, Phenoxy Epichlorohydrin Bisphenol see Poly-(cis-1,4-isoprene) 631-... [Pg.74]

Bis (p-hydroxyphenyl) propane, diglycidyl ether Bisphenol A-epichlorohydrin Bisphenol A-epichlorohydrin condensate DBEBPA DGEBA... [Pg.529]

Bisphenol A, epichlorohydrin polymer. See Epoxy, bisphenol A/epichlorohydrin Bisphenol A/epichlorohydrin resin CAS 25068-38-6 Synonyms 4,4 -... [Pg.530]

Phenol, o-isopropyl-. See o-lsopropylphenol Phenol, p-isopropyl. See p-lsopropylphenol Phenol, 4,4 -isopropylldenedl-. See Bisphenol A Phenol, 4,4 -isopropylidenedi-, polymer with 1-chloro-2,3-epoxypropane. See poxy, bisphenol A/epichlorohydrin Bisphenol A/epichlorohydrin resin... [Pg.3295]

Epoxy resin-based epichlorohydrin,bisphenol-A and cardanol was evaluated as a paint binder and found to show increased tensile strength, elongation, adhesive strength with steel and low water vapour transmission when compared to epoxy resin without cardanol. ... [Pg.196]

An epoxy resin-based on epichlorohydrin, bisphenol-A and cardanol was evaluated as a binder for a paint system and was found to offer better properties in terms of increase in tensile strength, elongation, bonding with steel and lowering of water vapour transmission than epoxy resin. In addition, iron oxide-based paints in epoxy-cardanol resin showed better performance than zinc phosphate-based paints." " ... [Pg.204]

Bisphenol A is mainly used to manufacture epoxy resins by the reaction with epichlorohydrin in the presence of caustic soda at 40 to 60 °C. This yields resins with a molecular weight between 450 and 4000. The molecular weight of the resins increases as the epichlorohydrin/bisphenol A ratio falls. [Pg.160]

SERs are prepared by two processes the taffy process and the advancement or fusion process. The first is directly from epichlorohydrin, bisphenol A, and a stoichiometric amount of NaOH. This process is very similar to the caustic coupling process used to prepare liquid epoxy resins. Lower epichlorohydrin to bisphenol A ratios are used to promote formation of high MW resins. The term taffy is derived from the appearance of the advanced epoxy resin prior to its separation from water and precipitated salts. [Pg.2667]

In the taffy process, a calculated excess of epichlorohydrin governs the degree of polymerization. However, preparation of the higher molecular weight species is subject to practical limitations of handling and agitation of highly viscous materials. The effect of epichlorohydrin-bisphenol A (ECH-BPA) ratio for a series of solid resins is shown in Table 6. [Pg.2668]

Table 6. Effect of Epichlorohydrin-Bisphenol A Ratio on Resin Properties of Taffy SERs...

The products obtained vary in molecular weight depending on the excess of epichlorohydrin used. The use of 10 1 mole ratio of epichlorohydrin bisphenol A gave a molecular weight of 370. However the use of 1.4 1 mole ratio gives a molecular weight of 791 [33]. [Pg.91]

Solid epichlorohydrin - bisphenol A resins are high-molecular, weight epoxy resins that are characterized by a repeat unit n ranging from 2 to about 30 for commercial resins and two terminal epoxy groups as ideally represented below ... [Pg.94]

These resins are best prepared by the reaction of epichlorohydrin, bisphenol A, and a stoichiometric amount of sodium hydroxide. The process has been referred to as the taffy process. [Pg.94]

Polymeric products [117] are obtained when the mole ratio is less than 2 for the epichlorohydrin-bisphenol A reaction and a molecular weight of 1420 is reported at a mole ratio of 1.2 [118]. High molecular weight resins (30,000 or more) are known as phenoxy resins, and these thermoplastic resins are used for coatings, adhesives, and various molding applications. [Pg.113]

As an example of the treatment of PMR data proposed by Hammerich and Willeboordse [85] consider the cases of epichlorohydrin - bisphenol-A condensates. Figure 3.10(a) exhibits the PMR spectrum of Bakelite epoxy resin ERL-2774, typical of that observed for the diglycidyl ethers of bisphenol A (DGEBA) where the mnltiplet at 2 ppm is attributable to pentadeuteroacetone. If n represents the number of repeat units, then the assignment and the number of protons contribnting to each lettered area are portrayed in Table 3.11. [Pg.166]

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