Polyamide packing seal for alkaline batteries
Packing seals made from a polyamide composition including at least polyamide 66 and polyamide 610 for alkaline batteries, optionally fillers and/or additives are described. The packing seals can be used in particular for standard “AAA” (LR03) and “AA” (LR6) batteries.
1. A packing seal for alkaline batteries, the packing seal comprising a polyamide composition comprising a mixture of polyamide 66 and polyamide 610, wherein the mixture comprises at least 30% by weight of polyamide 66 and at least 30% by weight of polyamide 610.
2. The packing seal as described by claim 1 , wherein the composition comprises from 30% to 70% by weight of polyamide 66 relative to the total weight of the composition.
3. The packing seal as described by claim 1 , wherein the composition comprises from 30% to 70% by weight of polyamide 610 relative to the total weight of the composition.
4. The packing seal as described by claim 1 , wherein the composition comprises an additive selected from the group consisting of a lubricant, a flame retardant, a plasticizer, a nucleating agent, an impact modifier, a reinforcing filler, a packing filler, a catalyst, a light stabilizer, a heat stabilizer, an antioxidant, an antistatic, a colorant, a mattifying agent and a molding aid.
5. The packing seal as described by claim 1 , wherein the composition comprises an impact-strength modifier.
6. The packing seal as described by claim 1 , wherein the composition comprises:
30% to 70% by weight of polyamide 66;
30% to 70% by weight of polyamide 610; and
0.1% to 40% by weight of impact-strength modifier; relative to the total weight of the composition.
7. An alkaline battery comprising electricity-generating elements and a packing seal as described by claim 1 .
8. A process for manufacturing packing seals, the process comprising molding a composition as described by claim 1 .
9. A method of reducing leakage of potassium hydroxide from an alkaline battery, the method comprising preventing the leakage with a composition as described by claim 1 .
10. The packing seal described by claim 1 , wherein the polyamide composition comprises a filler and/or an additive.
11. The packing seal described by claim 1 , wherein the mixture provides better chemical resistance to potassium hydroxide compared to a packing seal formulation that does not comprise a mixture of polyamide 66 and polyamide 610.