High impact resistance cast plates, their process for manufacture

摘要

Cast sheet obtained from a polymethyl methacrylate and polyurethane composition in such proportions that the ratio of the components of the polyurethane network (that is to say the sum of the organic compound(s) containing isocyanate and polyol(s) functional groups to the sum of these components and of methyl methacrylate is between 3 % and 8 % by weight, imparting to the said sheet an unnotched Charpy impact strength which is higher than or equal to 60 kJ/m<2>.