A COMPOSITION FOR SMC/BMC AUTOMOTIVE PARTS

摘要

The invention relates to a composition for SMC/BMC automotive parts comprising: (a) an unsaturated polyester resin, (b) a suitable low profile or low shrink additive or a mixture thereof; (c) a mixture of at least two peroxides neither of which contains a benzoyl group, one having a one-hour half-life temperature of 100°C or lower and the other having a one-hour half-life temperature of higher than 100°C, and (d) a transition metal salt or complex. Preferably, the additive does not contain benzene. It is further preferred that a mixture of two peroxides is used, one having a one-hour half-life temperature of 75-95°C and the other having a one-hour half-life temperature of 105-125°C. Preferably, the composition comprises a cobalt salt or complex, a copper salt or complex, or a mixture thereof. The invention further relates to a process for preparing an SMC or BMC automotive part comprising curing said composition. The use of the composition of the present invention allows for the preparation of SMC/BMC products having a low total volatiles content and a low smell.