US Patent 7992361 Polymer panels and methods of making the same

Disclosed herein are multiwall panels comprising micro-scale surface features and methods of making the same. In one embodiment, a multiwall panel is disclosed. The multiwall panel comprises, a top sheet, a bottom sheet, a rib disposed between and connected to the top sheet and the bottom sheet, and a micro-scale surface feature disposed on a surface of the multiwall panel, wherein the micro-scale surface feature comprises a width measured at a base of the surface feature, wherein the width is about 30 micrometers to about 3 millimeters. In another embodiment, a process of forming multiwall panels is disclosed. In yet another embodiment, a naturally lit structure is disclosed.