High-molecular-weight epoxy

Cross-linking with aminoplasts and phenoplasts constitutes an important class of hardeners for high molecular-weight epoxy resins that require elevated temperature cures (see Amino resins). 

As previously stated, to increase the cross-link density, multifunctional resins are mixed with these high molecular weight linear resins. An alternative to that approach is to add a multifunctional resin to the advancement process, thus synthesizing branched high molecular weight epoxy resins. 

Solid epoxy adhesives generally rely on high-molecular-weight epoxy resin for the solid appearance of the uncured adhesive. This epoxy resin is generally formulated with either ... 

Table 13.6 shows the characteristics and properties of supported and nonsupported high-molecular-weight epoxy resins cast from solvent solution. A crosslinked and uncrosslinked formulation using the same high-molecular-weight epoxy is shown for comparison. 

Epoxy-phenoUc High molecular weight epoxy resins cross-linked with phenolic resole resins Good Very good Most widely used system Universal gold lacquer for three piece cans Shallow drawn cans... 

Epoxy-amino and epoxyacrylate High molecular weight epoxy resins cross-linked with amino or acrylate resins Water reducible for reduced environmental impact Good Limited Universal lacquer for beer and beverage cans (water reducible) Side seam stripes Some food systems... 

Water-Borne Coatings Prepared from High Molecular Weight Epoxy Resins... 

Adhesion is usually improved while flexibility is maintained when using the high molecular weight epoxy emulsion as an upgrader in water-borne thermoplastic systems. 

P. Czub, Synthesis of high-molecular-weight epoxy resins from modified natural oils and bisphenol A or bisphenol A-based epoxy resins , Polym Adv Technol, 2009,20,194-208. 

An important example is the preparation of a waterdispersible product by graft polymerization of, for example, styrene-methacrylic acid copolymer onto the aliphatic backbone of a high molecular weight epoxy resin (15). 

BPA is used also in production of high-molecular-weight epoxies, a special group of very important epoxy resins, commonly used as coating materials. They are prepared mainly from low- or... 

Figure 7.16 Synthesis of high-molecular-weight epoxy resins by the fusion process.

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 ... 

Some of the major recent developments in the adhesives used in the electrical industry are the emergence of specially tailored surface mount adhesives the increased use and proliferation of polyimides the purification of die attach adhesives and other materials coming in close contact with IC dies and the use of high molecular weight epoxies in sealing flat panel displays. 

Continuous microwave reactor with rotating quartz tube for the synthesis of high-molecular-weight epoxy resin (Ertec, Poland). 

Bogdal, D. Pielichowski, J. Gorczyk, J. Microwave-assisted synthesis of high molecular weight epoxy resins. Nonlinear Opt., Quantum Opt. 2004, 52,111-116. 

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