Patent ID: 7401823

Claim:
A bumper system comprising a structural member made of a moulded plastic material having a low energy surface which is not surface treated and a reinforcing member attached to the structural member, the structural member and reinforcing member having complementary surfaces and being attached by means of an adhesive, on at least part of one of the complementary surfaces wherein the adhesive comprises an organoborane amine complex, one or more of monomers, oligomers or polymers having olefinic unsaturation which is capable of polymerisation by free radical polymerisation, and a compound which causes the complex to disassociate so as to release the organoborane, wherein; i) the reinforcing member is an energy absorbing unit made of metal or plastic material and the structural member is a bumper fascia made of plastic material; wherein the energy absorbing unit is bonded to the bumper fascia such that a closed box section is formed between the energy absorption unit and the bumper fascia; or ii) the reinforcing member is a bumper beam made of metal and the structural member is an energy absorbing unit made of plastic material wherein the energy absorbing unit is bonded to the bumper beam such that a closed box section is formed between the energy absorption unit and the bumper beam.