Patent ID: 7479517

Claim:
A process for the preparation of fast reheat polyethylene terephthalate resin, said process comprising: a) dispersing micron-sized carbon black in monoethylene glycol in the presence of one or more dispersing agents and adding nano-sized particles of ferric oxide and metallic antimony to obtain a mixed carbon slurry, b) preparing a raw material slurry of pure terepthalic acid, mono ethylene glycol, isopthalic acid in the presence of a polymerisation catalyst and one or more color toners, c) adding the carbon slurry to said raw material slurry to obtain an addition mixture, d) esterifying the addition mixture in an esterification reactor under controlled degree of polymerisation to obtain a pre-polymer, e) retaining a portion of said pre-polymer as pre-polymer heel in said reactor for subsequent batch reactions, f) polymerising the pre-polymer with an enhanced degree of polymerization, reduced pressure and temperature to obtain a polymer melt, g) stabilizing said polymer melt by adding at least a heat a stabilizing additive, h) extruding and converting the polymer melt to form amorphous pellets under nitrogen pressure and i) performing solid-state polymerization to obtain fast reheat polyethylene terepthalate resin.