Active ester type imide resin with main chain containing allyl as well as preparation method and application of active ester type imide resin

The invention belongs to the field of synthetic resin for an electronic material technology, and particularly relates to active ester type imide resin with a main chain containing allyl as well as a preparation method and application of the active ester type imide resin. The main chain of the active ester type maleimide resin provided by the invention contains allyl, so that the resin is endowed with good dielectric properties while the toughening of the bismaleimide resin is realized. In addition, the imide ring structure is good in heat resistance, so that the polymer is endowed with rigidity and also has good solubility. The problem that in the prior art, the dielectric property of a bismaleimide resin reinforcement belt for a high-performance copper-clad plate is reduced can be solved, and meanwhile the lamination process can be simplified. Besides, the prepared active ester type imide resin can also be used as a curing agent of epoxy resin and other matrix resins for copper-clad plates, so that the probl