Colored polyethylene terephthalate moulding compound and moulded products made therefrom

摘要

A polyethylene terephthalate moulding composition is disclosed having uniformly dispersed therein 10-25,000 ppm of caramel as a colorant. The colorant is non-toxic, does not affect the transparency of the polyester, and does not cause aldehyde formation. The caramel may have been formed in situ from a mono- or disaccharide which has been added to the bis(beta-hydroxyethyl)terephthalate before or during polycondensation or to the molten polyester. The color may have been intensified by adding an alkaline reacting compound. The composition may moreover contain further colorants. The composition is particularly suitable for use in the manufacture of food containers such as boxes, trays and bottles.