Non-halogenated flame retardant polycarbonate compounds
View Patent ↗A flame retardant polycarbonate compound is disclosed. The compound comprises a polycarbonate and non-halogenated polyphosphazene as a flame retardant, along with talc, polytetrafluoroethylene, and optionally, a potassium salt of perfluorobutane sulfonic acid. The compound can achieve a UL 94 rating of V-0 at two different thicknesses of less than 1 mm.
1. A flame retardant polycarbonate compound, consisting of:
(a) polycarbonate,
(b) polyphosphazene,
(c) talc,
(d) polytetrafluoroethylene,
(e) optionally, potassium salt of perfluorobutane sulfonic acid, and
(f) optionally, one or more additives selected from the group consisting of anti-oxidants, pigments, and combinations of them,
wherein the polyphosphazene is present in the compound at a weight percent from 5 to about 15,
and wherein the compound tested at a thickness of 0.75 mm and a thickness of 0.4-0.5 mm has a UL 94 rating of V-0.
2. The compound of claim 1 , wherein the polycarbonate is a branched polycarbonate of virginal source, recycled source, or both.
3. The compound of claim 1 , wherein the compound has ingredients in amounts expressed in weight percent:
Polycarbonate
80-90
Polyphosphazene
5-15
Talc
2-9
Polytetrafluoroethylene
0.1-0.8
Optional Potassium salt of
0-0.2
perfluorobutane sulfonic acid
Optional Additives
0-5.
4. The compound of claim 1 , wherein the compound has ingredients in amounts expressed in weight percent:
Polycarbonate
80-90
Polyphosphazene
5-10
Talc
3-8
Polytetrafluoroethylene
0.3-0.7
Optional Potassium salt of
0-0.1
perfluorobutane sulfonic acid
Optional Additives
0-3.
5. The compound of claim 1 , wherein the compound has ingredients in amounts expressed in weight percent:
Polycarbonate
80-85
Polyphosphazene
7-10
Talc
4-6
Polytetrafluoroethylene
0.4-0.6
Optional Potassium salt of
0-0.01
perfluorobutane sulfonic acid
Optional Additives
0-2.
6. A molded article made from the compound of claim 1 .
7. An extruded article made from the compound of claim 1 .
8. A calendered article made from the compound of claim 1 .
9. A thermoformed article made from the compound of claim 1 .
10. A method of using the compound of claim 1 , comprising the step of shaping the compound into an article designed to resist combustion or molten dripping in the presence of flame.
11. The method of claim 10 , wherein the polycarbonate of the compound is a branched polycarbonate of virginal source, recycled source, or both.
12. The method of claim 10 , wherein the shaping comprises extruding, molding, calendering, or thermoforming.
13. A flame retardant polycarbonate compound, consisting of:
(a) polycarbonate,
(b) polyphosphazene,
(c) talc,
(d) polytetrafluoroethylene, and
(e) optionally, potassium salt of perfluorobutane sulfonic acid,
wherein the polyphosphazene is present in the compound at a weight percent from 5 to about 15,
and wherein the compound tested at a thickness of 0.75 mm and a thickness of 0.4-0.5 mm has a UL 94 rating of V-0.