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US 7,923,100 B2Granted
Multilayer articles and methods for making multilayer articles
AssigneeSabic Innovative Plastics IP B.V.
InventorsSandeep Tripathi, Shreyas Chakravarti, Sapna Kirk Blackburn
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Abstract
In one embodiment, the sheet, comprises: a cap layer comprising an acrylic polymer; and a base layer, wherein the sheet is thermoformable. The base layer comprises a cycloaliphatic polyester copolymer and an optionally, an aromatic polycarbonate. The cycloaliphatic polyester copolymer can comprise greater than 10 wt % cycloaliphatic diol or acid or combination thereof, based upon a total weight of the cycloaliphatic polyester copolymer.
Claims16
A sheet, comprising:
- a cap layer comprising an acrylic polymer, wherein the cap layer is 10% to 30% of an overall thickness and the overall thickness is 5 mil to 500 mil;
- and
- a base layer comprising a cycloaliphatic polyester copolymer and an aromatic polycarbonate, wherein the cycloaliphatic polyester copolymer is poly(1,4-cyclohexylene dimethylene co-ethylene terephthalate);
- wherein the cap layer and base layer were coextruded to form the sheet which is thermoformable;
- wherein the sheet has a pencil hardness greater than or equal to 2H;
- and
- wherein the sheet has a tear propagation strength above 5 N/mm.
4 more elements
A method for making an article, comprising:
- melting an acrylic polymer in an extruder;
- forming a molten mixture comprising a cycloaliphatic polyester copolymer and an aromatic polycarbonate in an extruder, wherein the cycloaliphatic polyester copolymer is poly(1,4-cyclohexylene dimethylene co-ethylene terephthalate);
- coextruding the acrylic polymer and the molten mixture to form a sheet which is thermoformable, wherein the molten mixture forms a base layer and the acrylic polymer forms a cap layer on the base layer;
- wherein the cap layer is 10% to 30% of an overall sheet thickness;
- wherein the sheet has a pencil hardness greater than or equal to 2H;
- and
- wherein the sheet has a tear propagation strength above 5 N/mm.
4 more elements
Dependencies are inferred from the claim text.