Non-halogenated flame retardant polyamide compositions
View Patent ↗A non-halogenated flame retardant polyamide composition is disclosed which comprises a polyamide, a non-halogenated flame retardant, and a synergist. The polyamide may have a ratio of carboxylic acid to amine end groups of greater than 1.8. Products formed from the composition are also disclosed. The polyamide may comprise nylon 6,6.
1. A flame retardant polyamide composition consisting of one or more polyamides, a non-halogenated flame retardant, a synergist and/or a flow modifier, fiberglass, a heat stabilizer, and a filler, wherein at least one of the one or more polyamide has a ratio of carboxylic acid end groups to amine end groups of greater than 1.8.
2. The composition according to claim 1 , wherein the weight average molecular weight of the composition is from 20,000 to 100,000 Daltons.
3. The composition according to claim 1 , wherein the z-average molecular weight is from 30,000 to 600,000 Daltons.
4. The composition according to claim 1 , wherein the one or more polyamides are present in an amount from 35 to 70 wt. %, based on the total weight of the composition.
5. The composition according to claim 1 , wherein the non-halogenated flame retardant is present in an amount from 5 to 25 wt. %, based on the total weight of the composition.
6. The composition according to claim 1 , wherein the synergist and/or filler is present in an amount from 0.1 to 15 wt. %, based on the total weight of the composition.
7. The composition according to claim 1 , wherein the fiberglass is present in an amount from 5 to 45 wt. %, based on the total weight of the composition.
8. The composition according to claim 1 , wherein the heat stabilizer is present in an amount from 0.05 to 5 wt. %, based on the total weight of the composition.
9. The composition of claim 1 , wherein the synergist is phosphinate, aluminum diethyl-phosphinate, melamine polyphosphate or silicone powder.
10. A flame retardant polyamide composition consisting of a one or more polyamides, a non-halogenated flame retardant, a synergist and/or a flow modifier, fiberglass, a heat stabilizer, and a filler, wherein the composition meets at least one of the following conditions:
(a) the weight average molecular weight of the final composition is less than 300% greater than the weight average molecular weight of a starting polyamide resin;
(b) the number average molecular weight of the final composition is less than 100% greater than the number average molecular weight of a starting polyamide resin;
(c) the Z-average molecular weight of the final composition is less than 100% greater than the Z-average molecular weight of a starting polyamide resin;
(d) the polydispersity index of the final composition is less than 300% greater than the weight average molecular weight of a starting polyamide resin; or
(e) the intrinsic viscosity of the final composition is less than 100% greater than the intrinsic viscosity of a starting polyamide resin.
11. The composition of claim 10 , wherein the synergist is phosphinate, aluminum diethyl-phosphinate, melamine polyphosphate or silicone powder.