25-06-2020 дата публикации
Номер: US20200199310A1
Принадлежит:
The present invention relates to a sheet comprising polyester, the sheet comprising at least one area (a) wherein the area (a) comprises at least one groove having a depth of >50% with regard to the thickness of the sheet in the area (a), wherein the sheet has a thickness of 200-1000 μm in the area (a). Such sheet provides the ability to snap along the grooves in a predictable manner, whilst providing sufficient rigidity to avoid undesired bending under the influence of its own weight. 1. A sheet comprising: polyester , the sheet comprising an area (a) wherein the area (a) comprises a groove having a depth of >50% with regard to the thickness of the sheet in the area (a) , wherein the sheet has a thickness of 200-1000 μm in the area (a).2. The sheet according to claim 1 , wherein the polyester is poly(ethylene terephthalate).3. The sheet according to claim 1 , wherein the polyester has an intrinsic viscosity determined in accordance with ASTM D2857-95 (2007) of 0.6-1.5 dl/g.4. The sheet according to claim 2 , wherein the poly(ethylene terephthalate) comprises up to 20.0 wt % of moieties derived from a comonomer wherein the comonomer is one or more selected from isophthalic acid claim 2 , 1 claim 2 ,4-cyclohexanedimethanol claim 2 , pentaerythritol claim 2 , pyromellitic anhydride claim 2 , or combinations thereof.5. The sheet according to claim 1 , wherein the depth of the groove is >60% with regard to the thickness of the sheet in area (a).6. The sheet according to claim 1 , wherein the depth of the groove is >60% with regard to the thickness of the sheet in area (a) and the sheet has a thickness of 700-1000 μm.7. The sheet according to claim 1 , wherein the polyester is amorphous poly(ethylene terephthalate) claim 1 ,8. The sheet according to claim 1 , comprising at least one area (a) wherein the area (a) comprises at least one groove having a depth of >60% with regard to the thickness of the sheet in area (a) claim 1 , wherein the groove(s) divide the sheet in ...
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