| abstract |
A prepreg comprising at least one layer of fibres and a curable thermosetting resin system, the curable thermosetting resin system at least partly impregnating the at least one layer of fibres, wherein the curable thermosetting resin system comprises: a. a curable thermosetting resin including at least two epoxide groups; b. a curing agent for curing the curable thermosetting resin, wherein the curing agent includes at least one amine group; and c. an accelerator for accelerating the curing of the thermosetting resin by the curing agent, wherein the accelerator includes an azole group; wherein the curable thermosetting resin, the curing agent and the accelerator are provided in respective concentrations in the prepreg to provide that, after curing the thermosetting resin at a cure temperature of at least 140 °C for a period of from 1 to 6 minutes, (i) the cured thermosetting resin has a glass transition temperature Tg which is greater than the cure temperature and is within the range of from 150 °C to 180 °C and (ii) the cured thermosetting resin is at least 90% cured. |