Abstract: The invention relates to a multi-layer acrylic composition having at least two impact modified layers. The outer layer is an acrylic layer containing impact modifiers having a particle size of less than 225 nm, and the impact modifiers in the inner thermoplastic layer have a particle size of greater than or equal to 225 nm. The invention also relates to multi-layer composites having the multi-layer acrylic composition on one or both sides. The multi-layer acrylic composition can also include blends of acrylic and fluoropolymers.

Abstract: An optical disc such as a digital versatile disc (DVD) includes plural substrates which are bonded together to form a single disc structure. One of the substrates is manufactured so that regions of the substrate forming the central hub which is provided to receive the disc within its protective packaging case and in a disc player during playback operation have a thickness which is greater than the thickness of the reminder of the substrate, strengthening the central hub and improving the durability of the manufactured disc by increasing resistance to cracking failure along the inner diameter of the disc.