GLYCIDYL ESTERS OF PHTHALIC-ACID AS PLASTICIZERS AND STABILIZERS FOR PVC

Mono- and di-glycidyl esters of phthalic acid were tested as plasticizers and stabilizers for PVC. These were compared with commercial products, such as dibutylphthalate, di-2-ethylhexyl-phthalate, epoxydized soyabean oil and glycerine monooleate. The glycidyl esters of monoalkylphthalates exhibited, at lower temperature levels, a better solubility for PVC than di-2-ethylhexyl-phthalate. n-Octyl- and 2-ethylhexyl-glycidyl-phthalate are better than di-2-ethylhexyl-phthalate w.r.t. plasticizing and gelatinizing characteristics. Mixture of PVC with either of the two glycidyl esters exhibited also higher thermal stability than diethylhexyl-phthalate-PVC-mixture. n-Octyl- and 2-ethylhexyl-glycidylphthalate are comparable with glycerinmonooleate as PVC-co-stabilizer. However, they are as stabilizers inferior to epoxydized soyabean oil. The glycidyl esters exhibit a higher volatility compared to diisooctylphthalate, whereas, this is in the case of dibutylphthalate lower. Diglycidylphthalate is in contrast to alkylglycidylphthalates unstable above 130-degrees-C so that it is not suitable as PVC-plastizicer.