Fate of Maleic Anhydride During the Synthesis of Linoleic Acid Modified Alkyd Resin.

Abstract

The fate of maleic anhydride during the synthesis of linoleic acid modified (Oil length : 65%) alkyd resins employed both maleic and phthalic anhydrides, and maleic anhydride only as the dibasic acid was discussed.
Each components in obtained alkyd resins was detected by GLC method after hydrolysis of the resin. It was found that the considerable amounts of maleic anhydride was transmitted to the esters of fumaric acid and adducts of linoleic acid, and the formation of the maleic acid ester was small. Therefore, molecular weight and viscosity of maleic alkyd resins was higher than phthalic alkyd resin. In the resin using only maleic anhydride as dibasic acid, their effects was considered significant, such as the linoleic acid adducts of 40. 6% was formed and the resin was gelled at high acid value.
Fumaric acid showed similar behavior to maleic anhydride but the transformation to maleic acid ester wasn't found. Succinic anhydride was ineffective on obtained resin properties such as viscosity and molecular weight.