| abstract |
An efficient and cost-effective process for the production of coloured thermoplastic polyester, the process comprising extrusion of at least one thermoplastic polyester with at least one inherently coloured polyester as a master batch Uniformly coloured thermoplastic polyester, the polyester comprising at least one thermoplastic polyester and at least one inherently coloured polyester as master batch, said inherently coloured polyester comprises at least one chromophoric co-monomer such as carboxyl terminated chromophoπc co- monomer, particularly metallo phthalocyanine tetracarboxylic acid, in the polyester backbone, said metal is selected from copper, cobalt, nickel, iron, calcium, barium, zinc or vanadyloxy or any other transition metal The uniformly coloured polyester is further spinned into fibers or filaments having superior mechanical properties The uniformly coloured polyester is also spinned and blow molded into containers or bottles or films having uniform colouring and no extractive matter or no leaching of colour |