Process for dyeing a textile substrate containing residual oligomers

Abstract

A process for dyeing a textile substrate containing residual oligomers includes the steps of: a) attaching the textile substrate on a mounting carrier to constitute a substrate-loaded carrier which is to be subjected to supercritical dyeing in a dyeing autoclave; and b) overlying the textile substrate with a micro-porous film which includes pores having a pore size such that when the textile substrate is dyed in the dyeing autoclave, a dye-containing supercritical fluid is allowed to pass through the micro-porous film to permit the textile substrate to be dyed while the residual oligomers entrained in the supercritical fluid are retained by the micro-porous film.

What is claimed is: 
     
         1 . A process for dyeing a textile substrate containing residual oligomers, comprising the steps of:
 a) attaching the textile substrate on a mounting carrier to constitute a substrate-loaded carrier which is to be subjected to supercritical dyeing in a dyeing autoclave; and   b) overlying the textile substrate of the substrate-loaded carrier with a micro-porous film which includes pores having a pore size such that when the textile substrate is dyed in the dyeing autoclave, a dye-containing supercritical fluid is allowed to pass through the micro-porous film to permit the textile substrate to be dyed while the residual oligomers entrained in the supercritical fluid are retained by the micro-porous film.   
     
     
         2 . The process according to  claim 1 , wherein the pore size of the pores of the micro-porous film is smaller than a particle size of the residual oligomers. 
     
     
         3 . The process according to  claim 2 , wherein the pore size of the pores of the micro-porous film is in a range from 0.1 μm to 1.0 μm. 
     
     
         4 . The process according to  claim 3 , wherein the pore size of the pores of the micro-porous film is in a range from 0.2 μm to 0.8 μm. 
     
     
         5 . The process according to  claim 1 , wherein the micro-porous film has a thickness in a range from 10 mm to 90 mm. 
     
     
         6 . The process according to  claim 1 , wherein the micro-porous film is made from a polymeric material. 
     
     
         7 . The process according to  claim 6 , wherein the polymeric material is polytetrafluoroethylene. 
     
     
         8 . The process according to  claim 6 , wherein the polymeric material is polyurethane. 
     
     
         9 . The process according to  claim 6 , wherein the polymeric material is polypropylene. 
     
     
         10 . The process according to  claim 1 , wherein the textile substrate is made from a polyester material. 
     
     
         11 . The process according to  claim 1 , wherein the dye-containing supercritical fluid includes a disperse dye. 
     
     
         12 . The process according to  claim 1 , wherein in step a), the mounting carrier is tubular-shaped, and the textile substrate is wound on the tubular-shaped mounting carrier around an axis. 
     
     
         13 . The process according to  claim 1 , wherein the dye-containing supercritical fluid includes supercritical carbon dioxide.