Glycerol Ester of Gum Rosin

Glycerol Ester of Gum Rosin occurs as a hard, pale amber-colored resin (color N or paler as determined by ASTM Designation D 509) produced by the esterification of pale gum rosin with food-grade glycerin and purified by steam stripping. It is soluble in acetone and in toluene, but is insoluble in water. 

Generally recognized as safe (GRAS) notification for glycerol ester of gum rosin.T R. Chemicak, Chnl 2002. 

Rosin ester resins are used as modifiers in the formulation of chewing gum. The rosin derivative modifies the physical properties of the polymer used, providing the desired masticatory properties. The glycerol ester of hydrogenated rosin is the predominant choice, because stabilized materials have improved aging resistance, which extends the shelf life of the gum. 

Chem. Descrip. Deodorized glycerol ester of wood rosin, chewing gum grade... 

Synonyms Glycerol ester of wood rosin Glyceryl monorosinate Rosin, glyceryl ester Rosin, gum, glycerol ester Rosin gum, glyceryl ester Classification Thermoplastic resin gum... 

The earliest synthetic resin to be used in commerce seems to have been a polyester then termed ester gum, which was made by esterifying rosin (essentially an unsaturated monocarboxylic terpenoid acid, abietic acid) with glycerol. When cooked with tung oil (a glycerol ester of 9,11,13-octadecatrienoic acid), this provided varnishes that dried overnight. In this case, the polymer is formed by an addition copolymerisation process, but the product is nevertheless also a polyester. 

Glycerol Ester of Partially Hydrogenated Gum Rosin View Monograph... 

Chem. Descrip. Glycerol ester of a partially dimerized rosin CAS 8050-31-5 EINECS/ELINCS 232-482-5 Uses Softener or plasticizer for elastomeric masticatory agents in chewing gums modifier for rubbers, film-formers, and waxes in adhesives and protective coatings Features Thermoplastic resin... 

Since Maly first esterified rosin in 1865, practically every conceivable ester of rosin has been prepared, including the glycerol ester, called ester gum, introduced in 1900 for lacquers and printing inks. The methyl ester of hydrogenated rosin is used as a plasticizer in lacquers. Pentaerythritol esters, unmodified and modified with maleic anhydride and phenol-formaldehyde, are used in varnishes. In 1937, the coatings industry used 20 million pounds of phenolic resins modified with ester gum in 1987,66 million pounds were used. Phenolic resins modified with up to 80% ester gum were called 4-hour enamels. Because these enamels possess excellent resistance to hot water and alkali, ester gum replaced damar, copal, and kauri gums in paints, lacquers, and enamels in combination with tung oil. 

Easter gum, a cross-linked ester, is obtained by the esterification of glycerol or pentaerythritol with rosin. 

Compatible resins used with N/C include non-drying alkyds (see Chapter 12), acrylic resins and many natural resins and derivatives, such as dammar and ester gum. Natural resins are mixtures of relatively low molecular weight chemicals, often of uncertain chemistry (see rosin. Chapter 12). Ester gums are produced by reacting polyhydric alcohols, e.g. glycerol, with rosin. An increase in molecular weight occurs, since more than one molecule of monobasic rosin acid will react with one molecule of the alcohol. Replacement of... 

Union or United States. Ester gum is produced by the action of glycerol upon pinewood rosin to produce its esterified form, a mixture of di- and tri-glycerides, then purified by a process of steam-stripping in order to de-aromatise it, providing an odourless, tasteless gum type of m.p. 8O-90°C. SAIB is produced by controlled esterification of sucrose using acetic and isobutyric acid anhydrides and its composition is consequently dependent upon reaction conditions. 

---