A polymer composition with flame resistance and electrical tracking resistance.

Abstract

Disclosed is a thermoplastic polymer composition exhibiting a V-0 flame resistance rating at a thickness of 0.8 mm and a comparative tracking index of 600 V. The polymer composition may include a glass-reinforced polyester polymer, specifically a polybutylene terephthalate polymer. A flame retardant composition is combined with the polymer composition in addition to one or more insulating additives.

Claims

1. A polymer composition, A thermoplastic polymer comprising a polybutylene terephthalate polymer, wherein the thermoplastic polymer is present in the polymer composition in an amount of more than approximately 35% by weight; A flame retardant composition contained within the polymer composition, wherein the flame retardant composition comprises a non-halogen flame retardant, the non-halogen flame retardant comprises a phosphinate metal salt, and the non-halogen flame retardant is present in the polymer composition in an amount of at least about 10% by weight; Reinforcing fibers dispersed throughout the polymer matrix formed from the aforementioned thermoplastic polymer; An insulating additive, (a) A polymer or wax having a critical surface tension of less than approximately 40 dynes / cm, (b) Mineral fillers containing calcium, titanium, barium, magnesium, or combinations thereof, (c) mixtures of those The insulating additive is present in the polymer composition in an amount of less than 5% by weight, and the insulating additive is: Includes, The polymer composition exhibits a comparative tracking index of at least 600 V, and the polymer composition shows a V-0 rating when tested at a thickness of 0.8 mm by a vertical combustion test according to Underwriters Laboratories Test 94.

2. The polymer composition according to claim 1, wherein the insulating additive comprises a polymer or wax having a critical surface tension of less than about 39 dynes / cm.

3. The polymer composition according to claim 1, wherein the insulating auxiliary agent comprises a polymer or wax having a contact angle greater than approximately 70°.

4. The aforementioned insulating aid is 10 １１ The polymer composition according to claim 1, comprising a polymer or wax having a surface resistivity greater than ohms and a water absorption rate of less than 2.5%.

5. The polymer composition according to claim 1, wherein the insulating aid comprises a polymer or wax having a melting point of less than approximately 222°C.

6. The polymer composition according to claim 1, wherein the insulating additive comprises an aliphatic polyamide polymer.

7. The polymer composition according to claim 1, wherein the insulating additive comprises polyamide 11 or polyamide 12.

8. The polymer composition according to claim 1, wherein the insulating aid contains silicone and is present in the polymer composition in an amount of about 0.3% to about 4% by weight.

9. The polymer composition according to claim 8, wherein the silicone is added to the polymer composition as a masterbatch containing the silicone combined with a carrier polymer.

10. The aforementioned polybutylene terephthalate polymer is approximately 20 cm ３ / Over 10 minutes, and approximately 100 cm ３ The polymer composition according to claim 1, having a melt flow rate of less than 10 minutes.

11. The polymer composition according to claim 1, wherein the polymer composition does not contain carbodiimide.

12. The polymer composition according to claim 1, further comprising the thermoplastic polymer and bone char pigment.

13. The polymer composition according to claim 1, wherein the reinforcing fibers include glass fibers, and the reinforcing fibers have an average fiber length of about 1 mm to about 5 mm and an average fiber diameter of about 8 microns to about 15 microns.

14. The flame-retardant polymer composition according to claim 1, wherein the flame retardant composition further comprises a nitrogen-containing synergistic agent.

15. The flame-resistant polymer composition according to claim 14, wherein the nitrogen-containing synergistic agent comprises melamine or a melamine derivative.

16. The flame-resistant polymer composition according to claim 14, wherein the nitrogen-containing synergistic agent comprises melamine cyanurate.

17. The polymer composition according to claim 1, wherein the insulating additive comprises the mineral filler.

18. The polymer composition according to claim 17, wherein the mineral filler comprises pentacalcium hydroxydotris (orthophosphate), oxide, carbonate, sulfate, or hydroxyapatite.

19. The flame-resistant polymer composition according to claim 1, wherein the polymer composition further contains an organometallic compatibilizer.

20. An electrical connector comprising at least two opposing walls, between which a passage for receiving a contact element is defined, wherein the walls are formed from the polymer composition described in claim 1.

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