Blends of polycarbonates with polyamides, having high impact strength and high flexural modulus

A process for making a supertough polymer blend composition, said process consisting in blending the following components A, B, and C in the indicated proportions:

• C, 2-30% of an engineering grade polycarbonate resin;
• B, 3-20%, total, of at least one elastomeric compatibilizing agent carrying 0.1-5% of at least one pendant group selected from the group consisting of succinic anhydride groups and epoxide groups;
• and
• A, 50-95% of an engineering grade polyamide resin selected from the group consisting of nylon 6, nylon 11, nylon 12, nylon 6,12, nylon 12,12, and mixtures of two or more of those polyamides;
• the amount of polyamide A always being equal to 100% -(B%+C%);
• all the above percentages being by weight;
• under such conditions that the stock melt temperature is within the range of 300.degree. C. to 350.degree. C., inclusive, for a sufficient time to obtain a uniform dispersion of the polycarbonate and compatibilizing agent in a polyamide matrix;
• the resulting blend having a flexural modulus, as determined according to the ASTM Standard D790, that is always at least as high as the lower of that of the polyamide and of the polycarbonate:
• said blend consisting essentially of a polyamide matrix and a dispersed phase consisting of the polycarbonate and the compatibilizing agent.