Flame retardant compositions
Flame retardant compositions that are halogen-free or substantially halogen-free are disclosed. In certain examples, the compositions comprise a polyphenylene ether, a halogen-free or substantially halogen-free polyepoxide, and one or more phosphorated compounds. Prepregs, laminates, molded articles and printed circuit boards using the compositions are also disclosed.
1. A halogen-free or substantially halogen-free composition comprising a flame retardant amount of chemically combined phosphorous and having a glass transition temperature of at least about 140° C.
2. The halogen-free or substantially halogen-free composition of claim 1 further comprising a polyphenylene ether.
3. The halogen-free or substantially halogen-free composition of claim 2 further comprising a halogen-free or substantially halogen-free polyepoxide.
4. The halogen-free or substantially halogen-free composition of claim 3 further comprising a compatibilizing agent and a catalyst.
5. The halogen-free or substantially halogen-free composition of claim 3 in which the flame retardant amount of chemically combined phosphorous is about 3% to about 10% phosphorous by weight based on the weight of the halogen-free or substantially halogen-free composition.
6. A halogen-free or substantially halogen-free composition comprising a flame retardant amount of chemically combined phosphorous providing a peel strength of at least about 4 lb/inch width as tested by IPC-TM-650 2.4.8C.
7. The halogen-free or substantially halogen-free composition of claim 6 further comprising a polyphenylene ether.
8. The halogen-free or substantially halogen-free composition of claim 7 further comprising a halogen-free or substantially halogen-free polyepoxide.
9. The halogen-free or substantially halogen-free composition of claim 8 further comprising a compatibilizing agent and a catalyst.
10. The halogen-free or substantially halogen-free composition of claim 8 in which the flame retardant amount of chemically combined phosphorous is about 3% to about 10% phosphorous by weight based on the weight of the halogen-free or substantially halogen-free composition.
11. A halogen-free or substantially halogen-free composition comprising a flame retardant amount of chemically combined phosphorous and having a dielectric constant at 1 MHz (50% resin content) of about 5.0 or less as tested by IPC-TM-650 2.5.5.3C.
12. The halogen-free or substantially halogen-free composition of claim 11 further comprising a polyphenylene ether.
13. The halogen-free or substantially halogen-free composition of claim 12 further comprising a halogen-free or substantially halogen-free polyepoxide.
14. The halogen-free or substantially halogen-free composition of claim 13 further comprising a compatibilizing agent and a catalyst.
15. The halogen-free or substantially halogen-free composition of claim 13 in which the flame retardant amount of chemically combined phosphorous is about 3% to about 10% phosphorous by weight based on the weight of the halogen-free or substantially halogen-free composition.
16. A halogen-free or substantially halogen-free composition comprising a flame retardant amount of chemically combined phosphorous and having a dielectric dissipation factor at 1 MHz (50% resin content) of about 0.02 or less as tested by IPC-TM-650 2.5.5.3C.
17. The halogen-free or substantially halogen-free composition of claim 16 further comprising a polyphenylene ether.
18. The halogen-free or substantially halogen-free composition of claim 17 further comprising a halogen-free or substantially halogen-free polyepoxide.
19. The halogen-free or-substantially halogen-free composition of claim 18 further comprising a compatibilizing agent and a catalyst.
20. The halogen-free or substantially halogen-free composition of claim 18 in which the flame retardant amount of chemically combined phosphorous is about 3% to about 10% phosphorous by weight based on the weight of the halogen-free or substantially halogen-free composition.
21. A halogen-free or substantially halogen-free composition comprising a flame retardant amount of chemically combined phosphorous and having a flame retardancy of V-0 as defined by the UL-94 burn test.
22. The halogen-free or substantially halogen-free composition of claim 21 further comprising a polyphenylene ether.
23. The halogen-free or substantially halogen-free composition of claim 22 further comprising a halogen-free or substantially halogen-free polyepoxide.
24. The halogen-free or-substantially halogen-free composition of claim 23 further comprising a compatibilizing agent and a catalyst.
25. The halogen-free or substantially halogen-free composition of claim 23 in which the flame retardant amount of chemically combined phosphorous is about 3% to about 10% phosphorous by weight based on the weight of the halogen-free or substantially halogen-free composition.