Analytical approaches to identify potential migrants in polyester–polyurethane can coatings

Autor:	Laurence Castle, E. L. Bradley, Nick Harmer, James T. Guthrie, Peter Kenneth Thomas Oldring, Malcolm Driffield
Rok vydání:	2009
Předmět:	Cyclohexane Surface Properties Polyesters Health Toxicology and Mutagenesis Polyurethanes Food Contamination Toxicology Risk Assessment Oligomer Gas Chromatography-Mass Spectrometry Diffusion chemistry.chemical_compound Materials Testing Humans Organic chemistry Polyurethane Food Packaging Public Health Environmental and Occupational Health Plasticizer General Chemistry General Medicine Isocyanate Polyester Phthalic acid Monomer chemistry Consumer Product Safety Food Science
Zdroj:	Food Additives & Contaminants: Part A. 26:1602-1610
ISSN:	1944-0057 1944-0049
Popis:	The safety of a polyester-polyurethane can coating has been assessed using a suite of complementary analytical methods to identify and estimate the concentrations of potential chemical migrants. The polyester was based on phthalic acids and aliphatic diols. The polyisocyanate cross-linking agent was 1-isocyanato-3-isocyanatomethyl-3,5,5-trimethyl cyclohexane homopolymer (IPDI) blocked with methylethylketone oxime (MEKO) to make a one-part formulation. The overall migrate, obtained using solvent extraction of cured films, comprised almost completely of 12 cyclic and one linear polyester oligomer up to molecular weight 800 and containing up to six monomer units. These 13 oligomers covered a total of 28 isomeric forms. Other minor components detected were plasticisers and surfactants as well as impurities present in the starting materials. There was no detectable residue of either the blocked isocyanate (0.01 microg/dm(2)) used as the starting substance or the unblocked isocyanate (0.02 microg/dm(2)). The level of extractable IPDI was used as an indicator of the completeness of cure in experimental coatings. These studies revealed that there was an influence of time, temperature and catalyst content. Polymerisation was also influenced by the additives used and by the ageing of the wet coating formulation over several months. These studies allow parameters to be specified to ensure that commercial production coatings receive a full cure giving low migration characteristics.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9d99adaef8914ec75ab1f0d0c1d59c48 https://doi.org/10.1080/19440040903252256 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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