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US 4,540,727 AGranted
Polyamide compositions
AssigneeRaychem Corporation
InventorChristine E. Vogdes
Life of this patent
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Abstract
The high temperature aging of polyamides is substantially improved by incorporating therein an antioxidant and an oxide of a metal of Group II or III of the Periodic Table, preferably a crystalline aluminosilicate such as a synthetic zeolite. The amount of antioxidant is preferably 1 to 5% and the amount of metal oxide is preferably 0.5 to 5%. Polyamides which can be stabilized in this way include Nylon-6, Nylon-11 and Nylon-12.
Claims39
A composition which comprises
- (a) an organic polymer component which comprises a polyamide;
- (b) distributed in said polymer component, at least 0.5% by weight, based on the weight of the polyamide component, of an antioxidant;
- and
- (c) dispersed in said polymer component, an oxide which is present in an amount of from 0.5 to 5.0% by weight of the polyamide component and which can function as an acid scavenger in the composition, which is free from any coupling agent which substantially reduces its efficacy as an acid scavenger, and which is selected from
- (i) metal oxides which consist of oxygen and at least one metal, said at least one metal comprising a metal of Group II or III of the Periodic Table;
- and
- (ii) oxides which consist of oxygen, silicon, and at least one metal, said at least one metal comprising a metal of Group II or III of the Periodic Table;
- the total amount of the antioxidant (b) and the oxide (c) being at least 1% by weight, based on the weight of the polyamide.
5 more elements
A composition which comprises
- (a) an organic polymer component which comprises at least 70% by weight of a polyamide selected from Nylon-6, Nylon-6,6, Nylon-6,9, Nylon-6,10, Nylon-6,12, Nylon-11 and Nylon-12;
- (b) distributed in said polymer component, an antioxidant;
- and
- (c) dispersed in said polymer component, a crystalline aluminosilicate which is present in an amount of from 0.5 to 5.0% by weight of the polyamide component and which can function as an acid scavenger in the composition, which is free from any coupling agent which sustantially reduces its effacy as a scavenging agent, and which consists of oxygen, silicon and at least one metal, said at least one metal comprising aluminum;
- the total amount of the antioxidant (b) and the compound (c) being at least 1% by weight based on the weight of the polyamide.
2 more elements
Dependencies are inferred from the claim text.