Abstract: The present disclosure is directed to a process for recycling film materials, and is particularly directed to collecting spent release liners for labels and constructing new release liner stock from the spent materials. In order to use the waste film, the film is subjected to a process for increasing the intrinsic viscosity. In addition, a coloring agent may be incorporated into the film in order to mask yellowing. In one embodiment, a multilayered composite film is formed.

Abstract: Disclosed is a process for the production of polyethylene terephthalate (PET), comprising the steps of (i) reacting di(C.sub.1 -C.sub.4)alkyl terephthalate with ethylene glycol to yield bis-(2-hydroxyethyl) terephthalate, (ii) adding a sequestering agent based on phosphorus and (iii) polycondensing the bis-(2-hydroxyethyl) terephthalate to produce PET; wherein in step (i) a zinc catalyst is present and in step (iii) an antimony catalyst is additionally present, the amount of zinc being in the range of from 0.003 to 0.008% by weight (30 to 80 ppm), the amount of phosphorus being in the range of from 0.001 to 0.01% (10 to 100 ppm), and the amount of antimony being in the range of from 0.01 to 0.05% by weight (100 to 500 ppm), in each case such weights being relative to the weight of the di(C.sub.1 -C.sub.4)alkyl terephthalate; the molar ratio of the antimony to the zinc being in the range of from 1:0.95 to 1:0.