Glycerol ester of wood rosin

Glycerol ester of wood rosin (CAS 8050-31-5), also identified as E445 and commercially known as glyceryl rosinate, is produced by esterifying wood rosin with glycerol to yield a pale, tacky resin. It functions primarily as a density-adjusting agent and emulsion stabilizer in food and beverage applications, and as a tackifier and plasticizer across adhesive and rubber formulations.

In carbonated soft drinks and flavored beverages, E445 is used to weight citrus and flavor oils, preventing phase separation and maintaining uniform emulsion stability throughout shelf life. Pressure-sensitive adhesives and hot-melt formulations incorporate it as a tackifier to control tack, peel strength, and cohesion across a range of substrates for industrial use.

In rubber compounding, it acts as a plasticizer and processing aid, improving flow and reducing hardness in finished tire and rubber goods during the manufacturing process. Printing ink manufacturers also use it as a resin binder to adjust viscosity and improve adhesion to packaging substrates, ensuring high-quality results in commercial printing.

Glycerol ester of wood rosin is supplied as pale yellow to amber solid flakes or lumps. Food-grade material meeting FCC specifications is the standard commercial form for beverage and flavor applications. Technical-grade product is available for adhesive, rubber, and ink end uses where food compliance is not required, providing a versatile solution for various industrial manufacturing needs.