TOKYO/DETROIT (Reuters) – Takata Corp (7312.T) has modified the composition of an air bag propellant that contains a volatile chemical at the center of a recall of millions of cars worldwide, the company told Reuters. A Takata official, who did not want to be named but spoke on behalf of the company, did not specify how the recipe has changed, but said ammonium nitrate remained a part of the mix. There has not been any finding that ammonium nitrate or the earlier composition was somehow flawed.