Plasticizing composition

Abstract

The invention relates to a plasticizing composition comprising a vinyl chloride resin and a plasticizing agent which comprises at least one diester having the general formula (I), derived from a diacid selected from succinic acid, glutaric acid, adipic acid, ethylsuccinic acid, methylglutaric acid and mixtures thereof wherein: A is a C 4 to C 6 linear or branched aliphatic chain, and R is an alkyl, a cycloalkyl or an aryl. The plasticizing agent according to the present invention has a good performance for different types of formulations (foam, film and paste). Said plasticizer gels rapidly, has a very low viscosity, and ages very well. Efficient debubblizing is one of the key properties thereof. The foams prepared with said plasticizer have very low densities, a high expansion rate, and excellent qualities.

1 . A plasticizing composition, comprising a vinyl chloride resin and a plasticizing agent which comprises at least one diester of general formula (I):
   RO—OC-A-CO—OR  (I)
   derived from a diacid selected from succinic acid, glutaric acid, adipic acid, ethylsuccinic acid, methylglutaric acid, and mixtures thereof,   in which:
 A is linear or branched C 4  to C 6  aliphatic, and 
 R is alkyl, cycloalkyl or aryl. 
   
     
     
         2 . The composition as claimed in  claim 1 , wherein R is a substituted or unsubstituted cycloalkyl of 5 to 6 carbon atoms selected from cyclopentyl or cyclohexyl or an aryl chosen from benzyl, phenyl, and their isomers. 
     
     
         3 . The composition as claimed in  claim 1 , wherein R is a branched or unbranched alkyl having from 4 to 10 carbon atoms selected from n-butyl, t-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, ethylhexyl, isooctyl, n-nonyl, isononyl, n-decyl or isodecyl. 
     
     
         4 . The composition as claimed in  claim 1 , wherein the plasticizing agent is a mixture of:
 from 70% to 95% by weight of methylglutaric acid diester,   from 5% to 30% by weight of ethylsuccinic acid diester, and   from 0% to 10% by weight of adipic acid diester.   
     
     
         5 . The composition as claimed in  claim 1 , wherein the plasticizing agent is a mixture of:
 from 95% to 100% by weight of methylglutaric acid diester, and   from 0% to 5% by weight of ethylsuccinic acid diester.   
     
     
         6 . The composition as claimed in  claim 1 , wherein the composition additionally comprises one or more compounds selected from stabilizers, fillers, pigments, biocides, carbon black, adhesion promoters, viscosity reducers, thixotropic agents, thickening agents, blowing agents, dispersants, and other additives. 
     
     
         7 . The composition as claimed in  claim 1 , wherein the plasticizing agent additionally comprises one or more compounds selected from phthalate, adipate, benzoate, triglyceride and other polymers. 
     
     
         8 . A process for the production of a diester or a mixture of diesters of general formula (I):
   RO—OC-A-CO—OR  (I)
   in which:
 A is linear or branched C 4  to C 6  aliphatic, and 
 R is alkyl, cycloalkyl or aryl, 
   wherein the process comprises the following steps:
 hydrolysis of a dinitrile or a mixture of dinitriles selected from adiponitrile, methylglutaronitrile, ethylsuccinonitrile, glutaronitrile or succinonitrile to form a corresponding diacid intermediate or a mixture of diacids, 
 esterification of a diacid intermediate or of the diacid mixture in the presence of an alcohol to form a corresponding diester or mixture of diesters, 
 decoloration and purification of the diester or mixture of diesters. 
   
     
     
         9 . The process as claimed in claim  10 , wherein the diester or mixture of diesters is produced from a diacid selected from succinic acid, glutaric acid, adipic acid, ethylsuccinic acid, methylglutaric acid, and mixtures thereof. 
     
     
         10 - 11 . (canceled) 
     
     
         12 . A plastisol comprising the composition as claimed in  claim 1 , wherein the plastisol is in the form of a paste, film, or foam. 
     
     
         13 . The composition as claimed in  claim 1 , wherein the composition is an adhesive or an ink. 
     
     
         14 . A method for making an article, comprising dry blending or extruding a plasticizing composition according to  claim 1 . 
     
     
         15 . An article made by the method of  claim 14 , wherein the article is selected from toys, films, sheets, flexible pipes, coatings, cables, floor tiles, and synthetic leather articles.