Disproportionated rosin (DPR) is compound of dehydroabie acid and dihydroabtice acid, the DPR is processed through catalytic reaction of gum rosin on proper temperature. In the synthetic rubber industry, DPR is used as emulsifier in the producing of various products including styrene-butadiene rubber, chloroprene rubber, acrylonitrile-butadiene rubber and acrylonitrile-butadiene-styrene rubber. Using DPR as an emulsifier, rubber product will improve in cohesion, and the endurance to heat will increase for 25%. The endurance to both abrasion and laceration of this rubber is better than ordinary styrene-butadiene rubber. The cohesion will be greatly enhanced if blended with natural rubber.
Rosin modified maleic anhydride resin is a slight yellow transparent solid, which is adducts of gum rosin and maleic anhydride through the esterification by glycerol or pentaerythritol.
Modified Rosin Ester is an alcohol. It is a kind of white crystalline powder, which is soluble in ethanol, glycerol, ethylene glycol, formamide but insoluble in acetone, benzene, carbon tetrachloride, ether and petroleum ether.
Rosin modified maleic resin can be esterified by adding gum rosin to maleic anhydride, glycerol, or pentaerythritol. This type of resin is frequently used in the paint industry and is highly compatible with nitro-cotton, making it ideal for creating nitrocellulose lacquer. The finished product has a light color and retains its quality over time. Furthermore, this type of resin is suitable for use in ink and as a glossing agent for paper.
