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US 6,649,677 B2Granted
Polycarbonate sheet with improved fire retardant performance
AssigneeGeneral Electric Company
InventorsMarja A. Jaatinen, Johanes M. Goossens
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Abstract
It has been discovered that the fire resistance properties of polycarbonate sheet can be greatly enhanced by significantly reducing the viscosity of the resin used to manufacture the sheet. Moreover, the fire resistance of the sheet can be further enhanced by carefully controlling the content of phosphorous-based stabilizer, in combination with the processing release agent, within a specific range.
Claims40
A fire resistant polycarbonate sheet comprising:
- a) branched polycarbonate resin having an MVR above 11 cm3/10 minutes, wherein MVR is measured at 300° C. and 2.16 kg,
- b) a phosphorous-based stabilizer, and
- c) a processing release agent.
A fire resistant polycarbonate sheet comprising:
- a) linear polycarbonate resin having an MVR above 8 cm3/10 minutes, wherein MVR is measured at 300° C. and 1.2 Kg,
- b) a phosphorous-based stabilizer, and
- c) a processing release agent.
A fire resistant polycarbonate sheet comprising:
- a) linear polycarbonate resin having an MVR above 8 and below 20 cm3/10 minutes, wherein the MVR is measured at 300° C. and 1.2 kg,
- b) from 0.002 to 0.01 weight percent, based on the weight of the phosphorous, of a phosphorous-based stabilizer, and
- c) a processing release agent.
A fire resistant polycarbonate sheet comprising:
- a) a blend of a linear polycarbonate resin and a branched polycarbonate resin, wherein the blend has an MVR above 10 cm3/10 minutes measured at 300° C. and 2.16 kg,
- b) a phosphorus-based stabilizer, and
- c) a processing release agent.
Dependencies are inferred from the claim text.