Epoxy resins transesterification

Ally Acetate can be a starting material for polymers as a comonomer, for glycidyl acetate as a component of epoxy resins, for glycerol, for allyl alcohol by hydrolysis, and for the synthesis of allyl esters of higher acids or other compounds by transesterification or transallylation. Processes for the commercial production of allyl acetate have been developed by Bayer and Hoechst [60], and some Japanese companies. Such processes work in the gas-phase under similar conditions to those used in vinyl acetate manufacture and are currently operated by Showa Denko and Daicel [61]. 

Tetrahydrofurfuryl alcohol (THFA) is used to prepare tetrahydrofurfuryl acrylate and methacrylate in transesterification reactions with lower acrylate esters. These reactive monomers are used in the formulation of ultraviolet light-curable adhesives, coating, paints, and printing inks. THFA is an effective coalescing solvent for latex paints and is used in epoxy resin formulations. The oleic acid ester of THFA is used as a plasticizer for vinyl resin products. The high solvency of tetrahydrofurfuryl alcohol for dyes permits higher dye... 

The easiest acrylates to produce industrially are the epoxy acrylates their preparation (see Scheme 16.28) starts with an epoxide-functional resin (see Section 16.4.2). In principle any epoxide-functional material can be chosen. In this reaction (meth)acrylic resin is added to the epoxide at elevated temperatures, (around 90-130°C). The (meth)acrylic acid adds to the epoxide in a ring-opening reaction resulting in an ester alcohol group. Basically this reaction is similar to the reactions used in the preparation of epoxy resins (see Section 16.4). The reactions can be either acid- or base-catalyzed base catalysis is the more frequently used, since it limits the number of possible side reactions (for instance, transesterifications). Although these reactions can be carried out in solvent, industrially they are most frequently performed in bulk. Generally these preparations are performed in a batch-type process. 

Chem. Descrip. Triphenyl phosphite CAS 101-02-0 EINECS/ELINCS 202-908-4 Uses Costabilizer for PVC and other polymers such as PP vise, modifier, reactive diluent for a variety of resin systems, esp. epoxies antioxidant for syn. rubbers, butyrates flame retardant for PU foams in transesterification reactions lubricant oil additive chem. intermediate for prod, of other phosphite esters and phosphonates Features Improves adhesion, elec, props., dimensional stability Properties Colorless mobile liq. 10% P Albrite Tributyl Phosphate [Huntsman Surf. Sciences]... 

Uses Esterification/transesterification/polycondensation catalyst tor prep, of polyesters, unsat. polyesters, alkyds suitable tor food and pharmaceutical contact applies., such as coatings, epoxies, hybrid resins food pkg. adhesives, closures with sealing gaskets tor food containers food-contact paper/paperboard... 

Several studies have examined the adhesive properties of LCTs. Ochi and Takashima, and Carfagna and co-workers both foimd an increase in the lap shear strength for an LCT epoxy compared to an isotropic LCT (85,86). However, Frich and Economy (87) found that the lap shear strength with a titanimn substrate for an LCT that cures by transesterification was lower than that for an isotropic resin. Given the limited data available, it is not clear whether these differences are due to the substrates, surface pretreatment, the type of cure reaction, the liquid crystalline phase, or some other factor. However, most of these studies did find... 

Polyester acrylates produced by direct esterification or transesterification of residual hydroxyls are lower viscosity and thus offer a handling advantage. Due to the strong polyester use in Europe, these products were primarily developed by European suppliers. Properties of these resins can vary significantly depending on the raw material selection. Cure speed is generally slower than epoxy acrylates possibly due to their inability to form carbinyl radicals via hydrogen abstraction. 

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