1. A surface covering composition comprising:
a polymer;
a bio-based plasticizer;
a stabilizer; and
a co-stabilizer.
2. The surface covering composition of claim 1, wherein the polymer is polyvinyl chloride, polyvinylidene chloride or alkyl methacrylate.
3. The surface covering composition of claim 1, wherein the polymer is polyvinyl chloride.
4. The surface covering composition of claim 1, wherein the bio-based plasticizer is at least 90% bio-based content as defined by an ASTM-D6866 standard.
5. The surface covering composition of claim 1, wherein the bio-based plasticizer is 25-40 parts per 100 parts of the polymer.
6. The surface covering composition of claim 1, wherein the bio-based plasticizer is chloro-methoxy fat diethylene glycol dinitrate.
7. The surface covering composition of claim 1, wherein the stabilizer is 1-2 parts per 100 parts of the polymer.
8. The surface covering composition of claim 1, wherein the stabilizer is organocalcium, organozinc, organotin, organobarium or a combination thereof.
9. The surface covering composition of claim 1, wherein the co-stabilizer is 1.5-7 parts per 100 parts of the polymer.
10. The surface covering composition of claim 1, wherein the co-stabilizer is an epoxidized polyglyceride.
11. The surface covering composition of claim 10, wherein the epoxidized polyglyceride is expoxidized soybean oil or epoxidized linseed oil.
12. The surface covering composition of claim 1, further comprising a lubricant.
13. The surface covering composition of claim 12, wherein the lubricant is paraffin wax, calcium stearate, calcium acid, or a combination thereof.
14. The surface covering composition of claim 1, further comprising a filler.
15. The surface covering composition of claim 14, wherein the filler comprises calcium carbonate, talc, mica, fibers, silica, wollastonite, or a combination thereof.
16. The surface covering composition of claim 1, further comprising a pigment.
17. The surface covering composition of claim 16, wherein the pigment includes carbon black, titanium oxide, iron oxide, chromium oxide, lead chromate, silica, talc, china clay, metallic oxides, silicates, chromates, phthalocyanine blue, phthalocyanine green, carbazole violet, antrhrapyrimidine yeloow, flavanthrone yellow, isoindoline yellow, indanthrone blue, quinacridone violet, perylene reds, or diazo red, or combinations thereof.
18. A surface covering composition comprising:
a polymer;
a bio-based plasticizer;
a stabilizer; and
a co-stabilizer;
the composition having a total bio-based content of 1-35% as defined by an ASTM-D6866 standard.
19. The surface covering composition of claim 18, wherein the total bio-based content is 15-35% as defined by the ASTM-D6866 standard.
20. The surface covering composition of claim 18, wherein the total bio-based content is 20-30% as defined by the ASTM-D6866 standard.
21. The surface covering composition of claim 18, wherein the bio-based plasticizer is at least 90% bio-based content as defined by the ASTM-D6866 standard.
22. The surface covering composition of claim 18, wherein the polymer is polyvinyl chloride, polyvinylidene chloride or alkyl methacrylate.
23. The surface covering composition of claim 22, wherein the polymer is polyvinyl chloride.
24. The surface covering composition of claim 18, wherein the bio-based plasticizer is at least 90% bio-based content as defined by the ASTM-D6866 standard.
25. The surface covering composition of claim 18, wherein the bio-based plasticizer is 25-40 parts per 100 parts of the polymer.
26. The surface covering composition of claim 18, wherein the bio-based plasticizer is chloro-methoxy fat diethylene glycol dinitrate.
27. The surface covering composition of claim 18, wherein the stabilizer is 1-2 parts per 100 parts of the polymer.
28. The surface covering composition of claim 18, wherein the stabilizer is organocalcium, organozinc, organotin, organobarium or a combination thereof.
29. The surface covering composition of claim 18, wherein the co-stabilizer is 1.5-7 parts per 100 parts of the polymer.
30. The surface covering composition of claim 18, wherein the co-stabilizer is an epoxidized polyglyceride.
31. The surface covering composition of claim 30, wherein the epoxidized polyglyceride is expoxidized soybean oil, epoxidized linseed oil, or a combination thereof.
32. A surface covering comprising:
a polymer; and
a bio-based plasticizer being 25-40 parts per 100 parts of the polymer.
33. The surface covering of claim 32, further comprising a stabilizer being 1-2 parts per 100 parts of the polymer.
34. The surface covering of claim 33, wherein the stabilizer is organocalcium, organozinc, organotin, organobarium or a combination thereof.
35. The surface covering of claim 33, further comprising a co-stabilizer being 1.5-7 parts per 100 parts of the polymer.
36. The surface covering of claim 35, wherein the co-stabilizer is an epoxidized polyglyceride.
37. The surface covering of claim 36, wherein the epoxidized polyglyceride is expoxidized soybean oil or epoxidized linseed oil.
38. A surface covering comprising:
a layer of polymer having a bio-based plasticizer and cork.
39. The surface covering of claim 40, wherein the cork is granulated cork homogenously dispersed throughout the layer of the polymer.
40. The surface covering surface covering of claim 39, wherein the cork is 35-70 parts per 100 parts of polymer in the layer of polymer.
41. The surface covering of claim 40, wherein the bio-based plasticizer is 20-40 parts per 100 parts of polymer in the layer of polymer.
42. The surface covering of claim 41, further comprising a second layer of polymer having a second bio-based plasticizer.
43. The surface covering of claim 42, wherein the second bio-based plasticizer is 25-45 parts per 100 parts of polymer in the second layer of polymer.
44. The surface covering of claim 42, wherein the second bio-based plasticizer is the same as the bio-based plasticizer.
45. The surface covering of claim 42, wherein the second layer of polymer further includes a second cork.
46. The surface covering of claim 45, wherein the second cork is 35-70 parts per 100 parts of polymer in the second layer of polymer.
47. The surface covering of claim 45, wherein the second cork is the same as the cork.
48. The surface covering of claim 42, further comprising a third layer of polymer having a third bio-based plasticizer.
49. The surface covering of claim 48, wherein the third bio-based plasticizer is 30-50 parts per 100 parts of polymer in the third layer of polymer.
50. The surface covering of claim 48, wherein the third bio-based plasticizer is the same as the second bio-based plasticizer.
51. The surface covering of claim 48, wherein the third layer of polymer further includes a third cork.
52. The surface covering of claim 51, wherein the third cork is 35-70 parts per 100 parts of polymer in the third layer of polymer.
53. The surface covering of claim 51, wherein the third cork is the same as the second cork.
54. The surface covering of claim 40, wherein the bio-based plasticizer is 25-45 parts per 100 parts of polymer in the layer of polymer.
55. The surface covering of claim 40, wherein the bio-based plasticizer is 30-50 parts per 100 parts of polymer in the layer of polymer.
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. A lighting device comprising:
a first string of LEDs and a first switch coupled in series between a power supply node and ground;
a temperature sensor; and
a system controller configured to:
close the first switch during a normal operation mode to deliver a drive current to the first string of LEDs;
detect an over-temperature condition based on information provided by the temperature sensor; and
upon detecting the over-temperature condition, open the first switch to stop the drive current from flowing through the first string of LEDs.
2. The lighting device of claim 1 wherein the system controller is further configured to keep the first switch open upon detecting the over-temperature condition until the system controller is reset.
3. The lighting device of claim 2 wherein the system controller is reset when a voltage powering the system controller is dropped below a level that will allow the system controller to operate and then raised above the level that will allow the system controller to operate.
4. The lighting device of claim 2 wherein the system controller derives power from the power supply node and the system controller is reset when power at the power supply node is turned off and then turned back on.
5. The lighting device of claim 2 wherein system controller is further configured to close the first switch after being reset.
6. The lighting device of claim 1 further comprising voltage sensing circuitry configured to provide a signal indicative of a voltage at the power supply node and wherein the system controller is configured to keep the first switch open upon detecting the over-temperature condition until the voltage at the power supply node is below a defined threshold.
7. The lighting device of claim 6 wherein the system controller is further configured to close the first switch after the voltage at the power supply node falls below the defined threshold.
8. The lighting device of claim 1 wherein:
the system controller comprises an inputoutput port that is initially configured as an input port for receiving communications from an external device, and
the system controller is further configured to, upon detecting the over-temperature condition, reconfigure the inputoutput port as an output port and set the output port to a logic level indicative of the lighting device having experienced the over-temperature condition.
9. The lighting device of claim 8 wherein to set the output port to the logic level indicative of the lighting device having experienced the over-temperature condition, the output port is tied to ground.
10. The lighting device of claim 8 wherein the inputoutput port is coupled to an wireless communication sensor.
11. The lighting device of claim 10 wherein the wireless communication sensor is an infrared sensor.
12. The lighting device of claim 1 wherein the system controller is associated with memory, and is further configured to store information that indicates an over-temperature condition has occurred upon detecting the over-temperature condition.
13. The lighting device of claim 12 wherein the system controller is configured to store information for each over-temperature condition that occurs.
14. The lighting device of claim 12 wherein the system controller is configured to keep track of a number of over-temperature conditions that have occurred.
15. The lighting device of claim 1 wherein the over-temperature condition occurs when the information from the temperature sensor indicates a temperature associated with the first string of LEDs has exceeded a defined threshold.
16. The lighting device of claim 1 wherein the over-temperature condition occurs when the information from the temperature sensor indicates a temperature associated with the first string of LEDs has exceeded a defined threshold for a given period of time.
17. The lighting device of claim 1 wherein light emitted from the lighting device is white light at a desired color temperature.
18. The lighting device of claim 17 wherein the first string of LEDs comprises a plurality of series connected LEDs.
19. The lighting device of claim 18 wherein the plurality of series connected LEDs comprises a plurality of LEDs of a first type that emit light of a first color and the plurality of LEDs of a second type that emit light of a second color.
20. The lighting device of claim 19 wherein the light of the first color is reddish light and the light of the second color is one of greenish light and yellowish light.
21. The lighting device of claim 19 further comprising a second switch coupled across at least one of the plurality of LEDs of the first type and a third switch coupled across at least one of the plurality of LEDs of the second type wherein during the normal operation mode, the system controller is further configured to operate the second switch with a first pulse width modulated signal to control a relative intensity of the at least one of the plurality of LEDs of the first type and operate the third switch with a second pulse width modulated signal to control a relative intensity of the at least one of the plurality of LEDs of the second type.
22. The lighting device of claim 21 wherein the first pulse width modulated signal has a first duty cycle that is variable, the second pulse width modulated signal has a second duty cycle that is variable, and the system controller is configured to vary the first duty cycle and the second duty cycle based on an operating temperature derived from the temperature sensor.
23. The lighting device of claim 1 wherein the lighting device has a power supply port, which is configured to receive DC power from a power supply that is separate from the lighting device.
24. The lighting device of claim 1 wherein the first switch is a transistor.
25. The lighting device of claim 1 further comprising a second string of LEDs and wherein the second string of LEDs and the first switch are coupled in series between the power supply node and ground.
26. The lighting device of claim 1 further comprising a second string of LEDs and a second switch coupled in series between the power supply node and ground wherein the system controller is configured to:
close the second switch during the normal operation mode to deliver a drive current to the second string of LEDs; and
upon detecting the over-temperature condition, open the second switch to stop the drive current from flowing through the second string of LEDs.
27. A lighting device comprising:
a first string of LEDs and a first switch coupled in series between a power supply node and ground;
a temperature sensor; and
a system controller configured to:
close the first switch during a normal operation mode to deliver a drive current to the first string of LEDs;
detect an over-temperature condition based on information provided by the temperature sensor;
upon detecting the over-temperature condition, open the first switch to stop the drive current from flowing through the first string of LEDs wherein the first switch is kept open upon until the system controller is reset; and
close the first switch after the system controller is reset.
28. The lighting device of claim 27 wherein the system controller is reset when a voltage powering the system controller is dropped below a level that will allow the system controller to operate and then raised above the level that will allow the system controller to operate.
29. The lighting device of claim 28 wherein the system controller derives power from the power supply node and the system controller is reset when power at the power supply node is turned off and then turned back on.
30. The lighting device of claim 29 wherein the first string of LEDs comprises a plurality of LEDs of a first type that emit light of a first color and a plurality of LEDs of a second type that emit light of a second color.