Dialkyl terephthalates and their use

1. A plasticizer composition, comprising:

dialkyl terephthalate,

wherein the alkyl radicals of said dialkyl terephthalate have a longest carbon chain of at least 4 carbon atoms and have a total number of carbon atoms per alkyl radical of 5; and

at least one primary plasticizer selected from the group consisting of phthalic acid dialkyl esters, trimellitic acid trialkyl esters, adipic acid dialkyl esters, 1,2-cyclohexanedioic acid alkyl esters, 1,3-cyclohexanedioic acid alkyl esters with alkyl=alkyl radical having 8 to 10 carbon atoms, 1,4-cyclohexanedioic acid alkyl esters with alkyl=alkyl radical having 8 to 10 carbon atoms, glycol dibenzoates, alkylsulphonic esters of phenol with alkyl=alkyl radical having 8 to 22 carbon atoms, acylated citric acid trialkyl esters, non-acylated citric acid trialkyl esters, polymer plasticizers, glycerol esters and mixtures thereof, with the proviso that the primary plasticizer is not dioctyl phthalate, isononyl benzoate or dioctyl terephthalates; and

wherein from 85% to 98% of the alkyl radicals of said dialkyl terephthalate are n-pentyl radicals and from 15% to 2% are methylbutyl radicals.

2. The plasticizer composition according to claim 1 , wherein the fraction of primary plasticizers is from 20% to 99% by mass.

3. The plasticizer composition according to claim 1 , further comprising at least one alkyl benzoate where alkyl=alkyl radical having from 7 to 13 carbon atoms.

4. A composition, comprising:

the plasticizer composition of claim 1 ; and

a polymer selected from the group consisting of PVC, PVB, PAMA, homopolymers or copolymers based on ethylene, propylene, butadiene, vinyl acetate, glycidyl acrylate, glycidyl methacrylate, methacrylates, acrylates, acrylates or methacrylates in which attached to the oxygen atom of the ester group there are alkyl radicals of branched or unbranched alcohols having from one to ten carbon atoms, styrene, acrylonitrile, cyclic olefins and mixtures thereof.

5. The composition according to claim 4 , comprising suspension PVC, bulk PVC, microsuspension PVC or emulsion PVC.

6. The composition according to claim 4 , comprising further plasticizers, fillers, pigments, stabilizers, lubricants, blowing agents, kickers, antioxidants or biocides.

7. The composition according to claim 4 , which is a plastisol, a synthetic leather, a floorcovering, an underbody sealant, a coated fabric, a wallcovering, a varnish, a paint, a sealing compound, an ink or an adhesive.

8. A plasticizer, comprising:

the composition of claim 4 .

9. An adhesive, comprising:

the composition of claim 1 .

10. A sealing composition, comprising:

the composition of claim 1 .

11. A paint, comprising:

the composition of claim 1 .

12. An ink, comprising:

the composition of claim 1 .

13. A plasticizer composition, comprising:

dialkyl terephthalate,

wherein the alkyl radicals of said dialkyl terephthalate have a longest carbon chain of at least 4 carbon atoms and have a total number of carbon atoms per alkyl radical of 5; and

at least one primary plasticizer selected from the group consisting of phthalic acid dialkyl esters, trimellitic acid trialkyl esters, adipic acid dialkyl esters, terephthalic acid dialkyl esters, 1,2-cyclohexanedioic acid alkyl esters, 1,3-cyclohexanedioic acid alkyl esters with alkyl=alkyl radical having 8 to 10 carbon atoms, 1,4-cyclohexanedioic acid alkyl esters with alkyl=alkyl radical having 8 to 10 carbon atoms, glycol dibenzoates, alkylsulphonic esters of phenol with alkyl=alkyl radical having 8 to 22 carbon atoms, acylated citric acid trialkyl esters, non-acylated citric acid trialkyl esters, polymer plasticizers, glycerol esters and mixtures thereof;

wherein when said dialkyl terephthalates and said phthalic acid dialkyl esters are used together they are different from each other; and

wherein from 85% to 98% of the alkyl radicals of said dialkyl terephthalate are n-pentyl radicals and from 15% to 2% are methylbutyl radicals.