Tetrachlorophthallic anhydride TCPA

Many cross-sectional surveys report no or weak exposure-response relationships or even an inverse relationship for which survivor bias is the most probable explanation. For example, in a survey of a workforce exposed to tetrachlorophthalic anhydride (TCPA) carried out by the authors, all the cases affected in an epidemic of occupational asthma had left the factory before it was possible to carry out a survey (Venables et al., 1985a). In this survey, conclusions could be drawn by studying specific IgE against TCPA. However, reliable tests for specific IgE antibody are not available for all chemical respiratory allergens. 

Intrinsically non-flammable polymers are few, but phenolic resins have a good reputation both in Are and smoke performance, which has resulted in their becoming increasingly favoured for reinforced plastics structures, for example, underground transport, where such concerns are greatest. Polyether ether ketone (PEEK) is also a low fire and smoke polymer. Unsaturated polyesters, vinyl esters and epoxy resins bum readily, but modified versions are available with improved behaviour. For example, both bromine and chlorine are used extensively in the form of chlorendic (HET) acid, tetrachlorophthalic anhydride (TCPA) and tetrabromo-phthalic anhydride (TBPA) which can be reacted into the polyester in small quantities and can act as permanent (non-migrating) flame retardants. 

CAS 117-08-8 EINECS/ELINCS 204-171-4 Synonyms 1,3-lsobenzofurandione, 4,5,6,7-tetrachloro- Phthalic anhydride, tetrachloro- TCPA 4,5,6,7-Tetrachloro-1,3-isobenzofurandione 4,5,6,7-Tetrachlorophthalic anhydride Tetrachlorphthalic anhydride Classibcatton Chlorinated phthalic anhydride Empirical C CI,03 Formula C6CI,(C0)20... 

---