1. A flame retardant polycarbonate composition which is comprised of (I) a polycarbonate, (2) a phosphoric acid ester, (3) a functionalized acrylic polymer, (4) an alkyl methacrylate-diene-vinyl aromatic terpolymer, and (5) an anti-dripping agent. wherein the polycarbonate is present in the composition in an amount of at least about 85 weight percent, wherein the phosphoric acid ester is present at a level which is within the range of about 1 weight percent to about 12 weight percent, wherein the functionalized acrylic polymer is present at a level which is within the range of about 0.5 weight percent to about 4.5 weight percent, and wherein the alkyl methacrylate-diene-vinyl aromatic terpolymer is present at a level which is within the range of about 0.5 weight percent to about 4.5 weight percent, with the proviso that the sum of the amount of the functionalized acrylic acid polymer and the alkyl methacrylate-diene-vinyl aromatic terpolymer present in the composition does not total more than 5 weight percent.
2. A flame retardant polycarbonate composition as specified in claim 1 wherein the functionalized acrylic polymer is comprised of repeat units that are derived from ethylene, methylmethacrylate, and glycidyl methacrylate.
3. A flame retardant polycarbonate composition as specified in claim 2 wherein the alkyl methacrylate-diene-vinyl aromatic terpolymer is comprised of repeat units that are derived from 1,3-butadiene, styrene, and methyl methacrylate.
4. A flame retardant polycarbonate composition as specified in claim 3 wherein the phosphoric acid ester is present at a level which is within the range of 2 weight percent to 10 weight percent.
5. A flame retardant polycarbonate composition as specified in claim 4 wherein the functionalized acrylic polymer is present at a level which is within the range of 1 weight percent to 2 weight percent.
6. A flame retardant polycarbonate composition as specified in claim 4 wherein the alkyl methacrylate-diene-vinyl aromatic terpolymer is present at a level which is within the range of 2 weight percent to 3 weight percent.
7. A flame retardant polycarbonate composition as specified in claim 1 wherein the functionalized acrylic polymer and the alkyl methacrylate-diene-vinyl aromatic terpolymer are dispersed into said composition under dynamic reaction conditions.
8. A flame retardant polycarbonate composition as specified in claim 3 wherein the phosphoric acid ester is present at a level which is within the range of 5 weight percent to 9 weight percent.
9. A flame retardant polycarbonate composition as specified in claim 3 wherein the flame retardant polycarbonate composition is comprised of an anti-dripping agent.
10. A flame retardant polycarbonate composition as specified in claim 1 wherein the phosphoric acid ester is aromatic phosphate oligomer.
11. A flame retardant polycarbonate composition as specified in claim 10 wherein the aromatic phosphate oligomer is bisphenol A diphenylphosphate.
12. A flame retardant polycarbonate composition as specified in claim 10 wherein the aromatic phosphate oligomer is resorcinol diphenylphosphate.
13. A flame retardant polycarbonate composition as specified in claim 10 wherein the aromatic phosphate oligomer is 1,3-phenylene-bis(dixylenyl phosphate).
14. A flame retardant polycarbonate composition as specified in claim 9 wherein the anti-dripping agent is present at a level within the range of 0.05 to 0.5 weight percent.
15. A flame retardant polycarbonate composition as specified in claim 9 wherein the anti-dripping agent is present at a level within the range of 0.1 to 0.3 weight percent.
16. A flame retardant polycarbonate composition as specified in claim 14 wherein the anti-dripping agent is poly(tetrafluoroethylene).
17. A flame retardant polycarbonate composition as specified in claim 1 wherein said composition is void of clay.
18. A flame retardant polycarbonate composition as specified in claim 2 wherein the repeat units which are derived from ethylene are present at a level which is within the range of 45 weight percent to 89 weight percent, wherein the repeat units which are derived from methylmethacrylate are present at a level which is within the range of 10 weight percent to 40 weight percent, and wherein the repeat units which are derived from glycidyl methacrylate are present at a level which is within the range of 1 weight percent to 15 weight percent.
19. A flame retardant polycarbonate composition as specified in claim 18 wherein the alkyl methacrylate-diene-vinyl aromatic terpolymer is a block copolymer which contains 5 to 25 weight percent styrene repeat units, 50 to 90 weight percent butadiene repeat units and 5 to 25 weight percent methylmethacrylate repeat units.
20. A flame retardant polycarbonate composition as specified in claim 19 wherein the phosphoric acid ester is present at a level which is within the range of 2 weight percent to 10 weight percent, wherein the functional ized acrylic polymer is present at a level which is within the range of 1 weight percent to 2 weight percent, wherein the alkyl methacrylate-diene-vinyl aromatic terpolymer is present at a level which is within the range of 2 weight percent to 3 weight percent, wherein the flame retardant polycarbonate composition is comprised of an anti-dripping agent, and wherein the anti-dripping agent is present at a level within the range of 0.05 to 0.5 weight percent.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An actuator, comprising;
a housing; wherein the housing forms a supply port, a control port, and an exhaust port
a first poppet having a proximal end having a nipple extending therefrom, a distal end, and a poppet head therebetween, said first poppet slidably disposed within the housing;
a second poppet having a proximal end having a nipple extending therefrom, a distal end, and a poppet head therebetween, said second poppet slidably disposed within the housing adjacent to the first poppet, the second poppet being engageable with the first poppet and the first poppet being engageable with a seat of the housing to establish a fluid flow configuration, wherein the second poppet is identical to the first poppet, wherein the first poppet and the second poppet are movable between a de-energized configuration wherein flow is prohibited between the supply port and the control port, prohibited between the exhaust port and the supply port, and permitted between the control port and the exhaust port, plural partially energized configurations wherein flow is permitted between the supply port and the control port, between the control port and the exhaust port, and between the exhaust port and the supply port, and a fully energized configuration wherein flow is prohibited between the control port and the exhaust port and flow is permitted between the supply port and the control port;
a first poppet seat;
a second poppet seat, each poppet head being configured to engage both poppet seats.
2. The actuator of claim 1, wherein the distal end of each poppet forms a bore that is sized to receive the nipple.
3. The actuator of claim 2, wherein the nipple of the first poppet engages the bore of the second poppet.
4. The actuator of claim 3, wherein the poppet head of each poppet forms a first frusto-conical surface and a second frusto-conical surface.
5. The actuator of claim 4, wherein the first frusto-conical surface of each poppet is configured to engage the second poppet seat.
6. The actuator of claim 5, wherein the second frusto-conical surface of each poppet is configured to engage the first poppet seat.
7. A fluid control system, comprising:
a fluid supply;
a hydraulically controlled device;
a fluid exhaust; and
an actuator in fluid communication with the fluid supply, the hydraulically controlled device and the fluid exhaust, the actuator comprising:
a first poppet slidably disposed within the housing;
a second poppet slidably disposed within the housing adjacent to the first poppet, wherein the second poppet is identical to the first poppet;
a first poppet seat; and
a second poppet seat, each poppet being configured to engage both poppet seats, wherein each poppet comprises:
a proximal end, including a nipple extending therefrom;
a distal end; and
a poppet head therebetween, the poppet head being configured to engage the first poppet seat and the second poppet seat.
8. The fluid control system of claim 7, wherein the distal end of each poppet forms a bore that is sized to receive the nipple.
9. The fluid control system of claim 8, wherein the nipple of the first poppet engages the bore of the second poppet.
10. The fluid control system of claim 9, wherein the poppet head of each poppet forms a first frusto-conical surface and a second frusto-conical surface.
11. The fluid control system of claim 10, wherein the first frusto-conical surface of each poppet is configured to engage the second poppet seat.
12. The fluid control system of claim 11, wherein the second frusto-conical surface of each poppet is configured to engage the first poppet seat.