Laminate film and method for producing same using polyalkylene imine as a bonding agent

Claim 1

METHOD FOR PREPARING A COMPOSITE LAMINATE FILM STRUCTURE WHICH COMPRISIES APPLYING TO THE SARAN COATED SURFACE OF A SUBSTRATE OF A SARAN COATED REGENERATED CELLULOSE FILM BETWEEN ABOUT 5 GRAMS AND ABOUT 100 GRAMS PER THOUSAND SQUARE FEET OF SUBSTRATE SURFACE OF A POLYALKYLENE IMINE COMPRISED OF ALKYLENE UNITS CONTAINING FROM 2 TO ABOUT 4 CARBON ATOMS AS AN ADHESION-PROMOTING PRELIMINARY AND INTERMEDIATE COATING ON THE SARAN COATED SURFACE OF SAID SUBSTRATE, SAID SARAN COATING BEING A COPOLYMER CONTAINING BETWEEN ABOUT 25 AND ABOUT 95 WEIGHT PERCENT POLYMERIZED VINYLIDENE CHLORIDE; THEN DEPOSITING A MOLTEN LAYER OF A NORMALLY SOLID, FILM-FORMING, NONAROMATIC HYDROCARBON OLEFIN POLYMER OVER SAID INTERMEDIATE COATING OF SAID POLYALKYLENE IMINE ON SAID PRELIMINARILY TREATED SUBSTRATE; THEN COOLING SAID APPLIED POLYOLEFIN LAYER TO A NORMAL TEMPERATURE TO SOLIDIFY SAME ON SAID SUBSTRATE AND FORM A TIGHTLY ADHERING AND EFFECTIVELY LAMINATED POLYOLEFIN LAYER ON SAID SUBSTRATE.