Ambient Temperature-Curable Bond Primer for Bonded Repair

Two approaches are proposed for formulating a bond primer that can be cured at ambient or mildly elevated temperatures in 24 (preferably 12) hours. Both approaches use a light source to accelerate cure but the cure acceleration results from different chemical processes. In the first approach, a two pack system will be activated with light to release a base from a photolatent base that will subsequently accelerate anionic cure. In the second, a dual cure system uses a light source to activate the hardening of a free radical curing component while anionic cure will continue at ambient or at the allowed temperatures until final cure is achieved. A combination of both approaches may be needed to achieve the overall goal.