Du Pont of Canada Limited

Dupont Canada Inc.

Bernard J Kershaw

Theodore J Lang

A process for coating nylon film with polyvinylidene chloride is disclosed, comprising primer-coating the nylon film with an aqueous dispersion of a vinylidene chloride copolymer having a crystallinity index of less than 1.15 after 30 days' storage at 20.degree. C. and between about 1.05 and 1.20 when stored for 48 hours at 40.degree. C.; drying the primer-coated film; coating the primer-coated film with an aqueous dispersion of a vinylidene chloride copolymer capable of developing crystallinity to a level sufficient that the crystalline vinylidene chloride copolymer so-formed resists attack by an organic solvent, as measured by the Solvent Haze Test; and drying the coated film. During primer-coating and the first drying step, the film is kept under sufficient tension to prevent curling of the film. The coated film may be laminated to polyethylene to provide a laminate useful for packaging of processed food.

Process for coating nylon film with vinylidene chloride copolymers

Certain basic impurities, e.g., N-heterocyclic amines such as 2-methyl-4-amino-5,6-trimethylene pyrimidine are removed from adiponitrile by contact with solid acidic sorption agents, e.g., weak cation exchange resins before its hydrogenation to hexamethylene diamine to reduce odor and color of products prepared from the diamine.

Process for purifying adiponitrile

Certain basic impurities, e.g., N-heterocyclic amines such as 2-methyl-4-amino-5,6-trimethylene pyrimidine are removed from adiponitrile by contact with solid acidic sorption agents, e.g., strong acid ion exchange resins before its hydrogenation to hexamethylene diamine to reduce odor and color of products prepared from the diamine.

Process for the manufacture of hexamethylene diamine comprising the steps of contacting 2-cyanocyclopentanone alone or in mixture with adiponitrile with a mixture comprising ammonia and hydrogen in the presence of a catalyst prepared by reducing iron oxide with hydrogen. The process is conveniently conducted at a temperature in the range 100.degree. to 275.degree. C and at a pressure in the range of 300 to 600 kg/cm.sup.2. The mole ratio of ammonia to 2-cyanocyclopentanone is maintained at least 4:1 and the pressure of hydrogen is sufficient to essentially prevent conversion of the activated catalyst to iron oxide.

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Kingston, Canada

Bernard J Kershaw