Butylbenzyl phthalate

Only phthalate of commercial importance with differing side chains, one of them representing a benzyl group

Butylbenzyl  phthalate (BBzP) is a mixed ester of phthalic acid with benzyl alcohol and n-butanol. It is mainly used as plasticizer in PVC products like floorings, wall coverings and upholstery. Together with other polymers (based e.g. on polysulfide, polyurethane, acrylic, polyacrylics, polyvinylacetate, and nitrocellulose) it is present in sealants, adhesives, paints, inks, lacquers, and cosmetics.
BBzP is not chemically bound in the polymer matrix and may outgas and be released upon contact with fluids and fats.
Its degradation in the environment is relatively fast.
BBzP is toxic on reproduction and development in animal experiments. Furthermore, it is suspected to be endocrine disruptive.
It is very toxic to aquatic organisms and may cause long-term adverse effects in the aquatic environment.
In the EU, the use of BBzP is banned in childcare articles, toys and cosmetics. Furthermore, it will be included in the revised RoHS Directive.

For the Environmental Specimen Bank not the parent compound BBzP itself is analysed in human specimens but its major metabolite Mono-benzylphthalate (MBzP).