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US 2003/0214070 A1Published application
Multiwall polycarbonate sheet and method for its production
AssigneeGeneral Electric Company
InventorsJohannes Martinus Dina Goossens, Jan Henk Kamps, Lina Prada, Augustina Martina Tacke-Willemsen, Hendrik Verhoogt, Hendricus Franciscus Zirkzee
Life of this patent
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Abstract
A method for producing a thermoplastic sheet includes extruding a composition including a melt polycarbonate resin having a Fries content of about 10 ppm to about 2000 ppm. The composition enables the sheet to be extruded with excellent uniformity.
Claims38
A method for producing a thermoplastic sheet comprising:
- extruding a composition comprising a melt polycarbonate resin having a Fries content of about 10 ppm to about 2000 ppm.
A method for producing a thermoplastic sheet comprising:
- extruding a composition comprising greater than or equal to about 90 weight percent melt polycarbonate having a Fries content of about 50 ppm to about 2000 ppm, wherein the melt polycarbonate has a weight average molecular weight of about 25,000 to about 40,000 atomic mass units.
A method for producing a thermoplastic sheet comprising:
- extruding a composition comprising greater than or equal to about 95 weight percent melt polycarbonate, having a Fries content of about 100 ppm to about 1800 ppm, wherein the melt polycarbonate has a weight average molecular weight of about 30,000 to about 35,000 atomic mass units, and comprises repeating units having the structure:
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Dependencies are inferred from the claim text.