Halogen-free flame retardant polyamide moulding compositions with increased glow wire and fire resistance
AssigneeItalmatch Chemicals S.P.A.
InventorUgo Zucchelli
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Abstract
The present invention relates to halogen-free flame retardant compositions essentially comprising polyamide polymers (preferred is PA6), at least an Hypophosphorous acid metal salt (preferred is Aluminum hypophosphite), at least an organic phosphinate metal salt (preferred is Aluminum Di Ethyl Phosphinate), at least a Nitrogen based flame retardant agent (preferred is Melamine Cyanurate), at least an organic polyhydric polymer (preferred is EVOH) and optionally further conventional components. Such compositions are highly flame retarded at low thickness and have high Glow Wire temperature resistance.
Claims8
Halogen free flame retardant polyamide thermoplastic composition consisting of:
- a) at least a thermoplastic polyamide polymer;
- b) from 5% to 20% by weight of aluminum hypophosphite, as first flame retardant (1st FR) component;
- c) from 2.5% to 10% by weight of aluminum diethyl phosphinate, as second flame retardant (2nd FR) component;
- d) from 3% to 15% by weight of a Melamine cyanurate, as third flame retardant (3rd FR) component;
- e) from 0.5% to 5% by weight of an organic polyhydric polymer being defined as an organic polymeric molecule containing many hydroxyl (—OH) radicals, not linked to aromatic or conjugated unsatured bonds, as fourth flame retardant (4th FR) component, provided that said organic polyhydric polymer is not a phenol-formaldehyde resin;
- f) fillers and/or reinforcing fibers;
- and
- g) other conventional additives,
- the total percentage of components a) to g) being 100%.
Halogen free flame retardant polyamide thermoplastic composition consisting of:
- a) at least a thermoplastic polyamide polymer;
- b) from 5% to 20% by weight of aluminum hypophosphite, as first flame retardant (1st FR) component;
- c) from 2.5% to 10% by weight of aluminum diethyl phosphinate, as second flame retardant (2nd FR) component;
- d) from 3% to 15% by weight of a Melamine cyanurate, as third flame retardant (3rd FR) component;
- e) from 0.5% to 5% by weight of EVOH, as fourth flame retardant (4th FR) component;
- f) fillers and/or reinforcing fibers;
- and
- g) other conventional additives,
- the total percentage of components a) to g) being 100%.
Dependencies are inferred from the claim text.