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AssigneeAkzo N.V.
InventorsMarcel A. Werner, Arnold Venema, Michael G. H. Pisters
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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.
A coloured polyethylene terephthalate moulding compound, characterized in that in the moulding compound there is uniformly distributed 10-25000 ppm of caramel.
A process for preparing a coloured polyethylene terephthalate moulding compound, which comprises incorporating caramel substantially uniformly in the polyethylene terephthalate, the caramel being used in an amount of 10-25000 ppm.
A coloured polyethylene terephthalate container for solids or liquids, characterized in that the polyethylene terephthalate contains 10-25000 ppm of caramel.
Dependencies are inferred from the claim text.