Polyamide-hydrocarbon polymer systems
A bottle having a body made from a composition made by kneading together a water-insoluble polycarbonamide having recurring amide groups as integral parts of the polymer chain and molten polyethylene or polypropylene, under a pressure of at least 500 pounds per square inch, the polycarbonamide being present as at least 5% by weight of the combined polymers and the polyethylene or polypropylene being present as at least 5% by weight of the combined polymers, has an adherent internal coating of an organic plastic material resistant to the penetration of oxygen. The sole exemplification refers to the internal coating with a polyvinylidene halide of a bottle made from a p poly-S -caprolactam-polyethylene mixture. U.S.A. Specifications 2,405,950, 2,409,603, 2,542,771 and 2,762,791 are referred to.ALSO:An organic plastic composition resistant to the permeation of fluids is made by kneading together a water-insoluble polycarbonamide having recurring amide groups as integral parts of the polymer chain and molten polyethylene or polypropylene, under a pressure of at least 500 lbs. per square inch, the polycarbonamide being present as at least 5% by weight of the combined polymers, and the polyethylene or polypropylene being present as at least 5% by weight of the combined polymers. The polymers used may be initially in the form of pellets and made by mixing under extrusion conditions. The examples describe the admixture of varying proportions of poly S -caprolactam with branched or linear polyethylenes or a mixture of polyethylene and polypropylene. The compositions may be moulded into bottles or into films which may be applied hot to backings of paper, paper board, fibre board or metal foil. U.S.A. Specifications 2,405,950, 2,409,603, 2,542,771 and 2,762,791 are referred to.