Method of reducing gel time of polyester thermoset resins and product thereof

摘要

The gel time of unsaturated polyester thermosetting resins containing polymerizable vinyl monomers, such a styrene, and a vinylphosphonate flame retardant, such as the bis(hydrocarbyl)vinylphosphonates, which normally retards the gel time of such resins, is reduced by the addition of an effective amount for gel time reduction of maleic anhydride.