| 摘要 |
A composition having utility as a plasticizer for halogen-containing resins is a mixture of (a) at least two diesters of terephthalic acid or (b) at least two triesters of trimellitic acid. The diesters of terephthalic acid are represented by the general formula <IMAGE> wherein R1 is a phenyl radical or an aliphatic hydrocarbon radical of the formula CnHm, wherein n is an integer of 1 through 8 inclusive and m is equal to 2n+1; R2 is either hydrogen or an aliphatic hydrocarbon having one, two, three or four carbon atoms; x is an integer of 2 to 4 inclusive; y is an integer of 2 to 4 inclusive; The trialkyl esters of trimellitic acid are represented by the general formula <IMAGE> wherein R1 is a phenyl radical or an aliphatic hydrocarbon radical of the formula CnHm wherein n is an integer of 1 through 8 inclusive and m is equal to 2n+1; R2 is either hydrogen or an aliphatic hydrocarbon radical having one, two, three or four carbon atoms; a is 2, 3 or 4; b is 2, 3 or 4; and c is 2, 3 or 4. The composition provides a unique combination of properties which includes high plasticizing efficiency, low volatility, good low temperature properties and resistance to hexane extraction.
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