Multiwall polymer sheet comprising branched polycarbonate
AssigneeSabic Innovative Plastics IP B.V.
InventorsChristianus Johannes Jacobus Maas, Johann Wagner
Life of this patent
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Abstract
Disclosed herein are multiwall sheets and methods for making the same. In one embodiment, a multiwall sheet comprises: main layers and transverse walls. The multiwall sheet comprises: a total thickness of greater than or equal to about 45 mm, a weight of greater than or equal to about 4.5 kg/m2, and/or greater than or equal to about 8 cells and a U-value of less than or equal to about 1.2 W/m2K. The multiwall sheet further comprises greater than 75 wt % branched polycarbonate resin, based upon a total weight of the multiwall sheet.
Claims20
A multiwall sheet, comprising:
- main layers and transverse walls, wherein the main layers comprise outerwalls;
- a total thickness of greater than or equal to 45 mm;
- and/or a weight of greater than or equal to 4.5 kg/m2;
- and/or greater than or equal to 8 cells located in a straight line between the outerwalls, wherein the line is perpendicular to the outerwalls and a U-value of less than or equal to 1.2 W/m2K;
- and
- greater than 75 wt % branched polycarbonate resin, based upon a total weight of the multiwall sheet;
- and
- wherein the total thickness of the multiwall sheet varies by less than or equal to 2% from an average total thickness, and wherein the average total thickness is determined over an area of 1,200 mm width by 4,200 mm long using at least 10 data points across the width, and/or adjacent main layers will vary by less than or equal to 20% from an average adjacent layer average thickness wherein the average adjacent layer thickness is determined over an area of the adjacent layers of 1,200 mm width by 4,200 mm long using at least 10 data points across the width.
A multiwall sheet, comprising:
- main layers;
- transverse walls;
- and
- dividers;
- wherein the multiwall sheet comprises a total thickness of greater than or equal to 45 mm, and greater than 75 wt % branched polycarbonate resin, based upon a total weight of the multiwall sheet.
A multiwall sheet, comprising:
- main layers;
- transverse walls;
- and
- dividers;
- wherein the multiwall sheet comprises a weight of greater than or equal to 4.5kg/m2, and greater than 75 wt % branched polycarbonate resin, based upon a total weight of the multiwall sheet.
A multiwall sheet, comprising:
- main layers comprising outerwalls;
- transverse walls;
- and
- dividers;
- wherein the multiwall sheet comprises greater than or equal to 8 cells located in a straight line between the outerwalls, wherein the line is perpendicular to the outerwalls, a U-value of less than or equal to 1.2 W/m2K, and greater than 75 wt % branched polycarbonate resin, based upon a total weight of the multiwall sheet.
A method for producing a multiwall sheet comprising:
- extruding polycarbonate resin to form the multiwall sheet having main layers and transverse walls, wherein the main layers comprise outerlayers;
- wherein the multiwall sheet is straight and comprises
- a total thickness of greater than or equal to 45 mm;
- and/or a weight of greater than or equal to 4.5 kg/m2;
- and/or greater than or equal to 8 cells located in a straight line between the outerwalls, wherein the line is perpendicular to the outerwalls and a U-value of less than or equal to 1.2 W/m2K;
- and
- greater than 75 wt % branched polycarbonate resin, based upon a total weight of the multiwall sheet.
Dependencies are inferred from the claim text.