Laminates on the basis of polypropylene and process for preparin

Details Laminates on the basis of polypropylene and process for preparin Laminates on the basis of polypropylene and process for preparin

1984-10-01

1986-04-01

Buffalow, Edith

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

428 35, 428518, 264291, 264DIG73, 15624411, B32B 2708

Patent

active

045797846

ABSTRACT:
The invention accords to a laminate at least consisting of a first layer from a mixture of at least a propylene polymer and an ethylene-vinylalcohol copolymer and a second layer from at least one propylene polymer, the first layer at least consisting of a mixture of 60-99 parts by weight of a substantially crystalline propylene polymer and 1-40 parts by weight of an ethylene-vinylalcohol copolymer, the second layer at least consisting of a substantially crystalline propylene polymer, the said ethylene-vinylalcohol copolymer having a melting temperature at atmospheric pressure which is at most equal to and not more than 30K lower than the melting temperature at atmospheric pressure of the one of the substantially crystalline propylene polymers used having the highest melting temperature, and the laminate having been subjected to multi-axial stretching to a degree of at least twice in at least 2 directions at a temperature which at most equals the melting temperature of the one of the substantially crystalline propylene polymers used having the highest melting temperature and to a process for preparing such a laminate.

REFERENCES:
patent: 3847728 (1974-11-01), Hirata et al.
patent: 3931449 (1976-01-01), Hirata et al.
patent: 3975463 (1976-08-01), Hirata et al.
patent: 4362844 (1982-12-01), Lemstra et al.

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