Patent ID: 7651648

Claim:
A method of forming an article which includes a substrate and a capstock material, wherein said substrate material comprises a polymer which is different than the capstock material and said capstock material comprises a melt-processable thermoplastic composition comprising: (a) 50-99.5 wt % of a melt-processable thermoplastic polymer; and (b) 0.5 to 50 wt % of a particulate polymer comprising a homopolymer of methyl methacrylate or a copolymer comprising the residues of a monomer mixture comprising at least 50 wt % methyl methacrylate and up to 50 wt % of a copolymerisable acrylic comonomer comprising at least one alkyl acrylate or methacrylate and 0 to 10 wt % of a copolymerisable cross-linking monomer, said particles having a maximum dimension of 5 mm and having a weight averaged diameter of between 100 μm and 500 μm; the method comprising the steps of applying the capstock material over a layer of the substrate material and then calendaring said capstock material and said substrate material with calendaring rolls to form said article, wherein said capstock material contacts said calendar rolls for a shorter period of time than said substrate material.