Thermoplastic workable, fiber reinforced polyamide moulding mass, rendered flame-retardant by magnesium hydroxide, procedure for its preparation and its use

摘要

The fibre-reinforced thermoplastic polyamide moulding composition which has been rendered flame-retardant by means of magnesium hydroxide comprises I. from 25 to 40% by weight of a thermoplastic polyamide, II. from 40 to 70% by weight of flake-form magnesium hydroxide having a specific surface area of less than 18 m2/g, III. from 0.1 to 20% by weight of a functionalised olefin homopolymer or copolymer and IV. from 3 to 30% by weight of an inert reinforcing fibre, and additional additives required for the application and/or the process, the amounts of components I to IV adding up to 100% by weight. …??These polyamide moulding compositions have the advantage over comparable moulding compositions that they can be moulded even at temperatures above 300 DEG C without degradation phenomena occurring and can be converted into mouldings having thin-walled parts which have high strength and can be employed in the electrical sector, the burning duration furthermore being short and no drips being observed on flame treatment. Mouldings produced from the compositions according to the invention retain their functionality to a large extent even in the event of fire since no corrosive gases are involved and shortcircuiting, etc, is thus reduced.