Polyamide molding compounds and molded articles produced therefrom
AssigneeEms-Patent AG
InventorsOliver Thomas, Nikolai Lamberts, Botho Hoffmann, Andreas Bayer
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Abstract
The present invention relates to polyamide molding compounds which have an improved resistance to heat-aging and comprise the following compositions: (A) 25 to 84.99 wt.-% of at least one polyamide, (B) 15 to 70 wt.-% of at least one filler and reinforcing means, (C) 0.01 to 5.0 wt.-% of at least one inorganic radical interceptor, (D) 0 to 5.0 wt.-% of at least one heat stabilizer which is different from the inorganic free-radical scavenger under (C), and (E) 0 to 20.0 wt.-% of at least one additive. The invention further relates to molded articles produced from these polyamide molding compounds as components in the automobile or electrics/electronics sector.
Claims12
A polyamide moulding compound having the following composition:
- (A) 25 to 84.99% by weight of at least one caprolactam-containing polyamide (A1) with a caprolactam content of at least 50% by weight and at least one further polyamide (A2),
- (B) 15 to 70% by weight of at least one filler and reinforcing means,
- (C) 0.01 to 5.0% by weight of at least one inorganic radical interceptor,
- (D) 0 to 5.0% by weight of at least one heat stabiliser which differs from the inorganic radical interceptor (C), and
- (E) 0 to 20.0% by weight of at least one additive,
- components (A) to (E) adding up to 100% by weight;
- wherein component (A) is formed from 10 to 40% by weight of at least one caprolactam-containing polyamide (A1) and 60 to 90% by weight of at least one polyamide (A2), components (A1) and (A2) adding up to 100% by weight;
- wherein the inorganic radical interceptor (C) is a lanthanoid compound selected from the group consisting of fluorides, chlorides, bromides, iodides, oxyhalides, sulphates, nitrates, phosphates, chromates, perchlorates, oxalates, the monochalcogenides of sulphur, selenium and tellurium, carbonates, hydroxides, trifluoromethanesulphonates, acteylacetonates, alcoholates, and 2-ethylhexanoates of lanthanoid or lanthanoids wherein the lanthanoid or lanthanoids are selected from lanthanum, cerium, praesodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium,
- hydrates of the above-mentioned salts, and
- mixtures of the above-mentioned compounds;
- wherein the at least one heat stabiliser (D) is selected from the group consisting of
- a) compounds of mono- or bivalent copper,
- b) stabilisers based on secondary aromatic amines,
- c) stabilisers based on sterically hindered phenols,
- d) phosphites and phosphonites, and
- e) mixtures of any of a), b), c) and d);
- wherein the proportion of the at least one stabiliser (D) is 0.01 to 5.0% by weight.
Dependencies are inferred from the claim text.