Scratch-resistant Layered Composite and Articles

[0046]Co-extruded film articles comprising of a top layer containing various amounts of DMBPC-PC and bisphenol A polycarbonate substrate were made using the calendering process. Commercial grade Lexan® ML9735 was used for the substrate. The DMBPC-PC used in the compositions was made by a melt process and had the following properties;

MW25,000 (PC standards)MFR8 g / 10 minTg137° C.

The BPA-PC used was LEXAN® 101 which has the following properties:

MW30,500 (PC standards)MFR7 g / 10 minTg144° C.

[0047]The two layer composite formed had an overall thickness of about 10 mil (250 micrometers), of which the top layer was about 20% i.e. about 2 mil (50 micrometers).

[0048]The film samples were tested for scratch resistance via pencil hardness test (ASTM D3363), abrasion resistance via tabor abrasion test at 50 cycle (ASTM D1044) and impact performance via multi-axial impact test (ASTM D3763). The sides with DMBPC-PC containing cap layers were the sides impacted. The film samples were also thermofo