Bisphenol A additives

Effect of Bisphenol A Addition Two-Particle Size Systems. If we modify the Hycar CTBN-epoxy resin system so as to produce a two-particle size system, we can produce the toughest epoxy resins. We modified the CTBN-epoxy resin system by adding bisphenol A. A many-fold improvement in fracture energy is obtained when Hycar CTBN is used with bisphenol A and epoxy resin. The maximum improvement, when 5 phr Hycar CTBN is used, is at a bisphenol A concentration of 24 parts per hundred parts of epoxy resin. Typical data describing the properties of these systems are shown in Table VI. 

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