By T. R. Crompton
Plastics are actually getting used on a wide scale for the packaging of fatty and aqueous foodstuffs and drinks, either alcoholic and non-alcoholic. hence it truly is most likely that a few move of polymer ingredients will ensue - adventitious impurities comparable to monomers, oligomers, catalyst remnants and residual polymerisation solvents and coffee molecular weight polymer fractions - from the plastic into the packaged fabric with the ensuing threat of a poisonous probability to the shopper. This booklet covers all elements of the migration of additions into foodstuff and provides exact info at the analytical decision of the ingredients in a number of plastics. This publication may be of curiosity to these engaged within the implementation of packaging laws, together with administration, analytical chemists and the brands of meals, drinks, prescription drugs and cosmetics and likewise clinical and toxicologists within the packaging undefined. --------------------------------------------------------------------------------
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Extra resources for Additive Migration from Plastics into Food; A Guide for Analytical Chemists
1 Chemicals Added During Polymerisation In this category is included the addition of up to 10% mineral oil (to impart flexibility to the product during the manufacture of high impact polystyrene by the copolymerisation of styrene and synthetic rubbers). 5% level. Its function is to prevent sticking in thin films of the polymer. 2 Antioxidants Antioxidants which prevent degradation of the polymer by reaction with atmospheric oxygen may be required during moulding operations on the polymer and will be needed to prevent oxygen pickup and oxidation and embrittlement of polymer during long-term usage.
1, a single polymer might contain Ziegler catalyst remnants, neutralising chemicals, residual monomer and polymerisation solvent (polymerisation residues), a calcium salt and an antioxidant (processing aids) and a further antioxidant also a light stabiliser and a filler (end product additives). Further information on the various types of non-polymeric components that can occur in polymers is discussed in the next section. 1 Polymerisation Residues Low pressure polyethylene might contain minute traces of oxygen or nitrogen or sulfur chain transfer catalyst residues.
It can be injection moulded, blow moulded and extruded. Applications in food packaging include injection moulded cake and bread trays and margarine tubs. Polystyrene-6-polydimethyl siloxane has been used as an additive to long chain branched polyethylene and narrow molecular weight polystyrene to control barrier properties. 7 Polyacrylonitrile This polymer has good chemical and oil and grease resistance. Its only application in which it might come into contact with food is as a filter cloth in food manufacturing equipment.