THERMOPLASTIC POLYESTER RESINS REINFORCED WITH GLASS FIBRES AND PARTICULATE MICA

摘要

The invention concerns moulding compositions comprising a poly(1,4- butylene terephthalate) resin, and a poly(ethylene terephthalate) resin, comprising a reinforcing agent which is a combination of glass fibres and particulate mica having a particle size from 325 to 10 mesh (U.S. Standard Sieve), preferably less than 100 mesh. Preferably the reinforcing agent comprises from 1 to 15 parts of glass fibres and 15 to 30 parts of mica, per 100 parts by weight of composition. The presence of the mica leads to enhanced resistance to warpage, and a higher deflection temperature under load.