Process for preparing high barrier, heat-sealable packaging film

Details Process for preparing high barrier, heat-sealable packaging film Process for preparing high barrier, heat-sealable packaging film

1974-12-20

1976-05-25

Husack, Ralph

Coating processes

Application to opposite sides of sheet, web, or strip

427379, 427381, 427385, 427390, 427407, 428520, B05D 138, B32B 2730

Patent

active

039595269

ABSTRACT:
An improvement in a process for preparing a high barrier, heat-sealable packaging material. A flexible base sheet carrying at least a one side copolymer high barrier coating applied from a solvent solution receives a second copolymer coating having optimum heat sealing properties from a dilute solvent coating system thereby yielding, when finally dried, a double copolymer distribution on the base sheet surface having a low level of total retained solvents, particularly high boiling point solvents.

REFERENCES:
patent: 2990391 (1961-06-01), Grantham
patent: 3166435 (1965-01-01), Meier
patent: 3353990 (1967-11-01), Vieth et al.
patent: 3511793 (1970-05-01), Ezell
patent: 3565669 (1971-02-01), McDermott et al.
patent: 3676185 (1972-07-01), Phillips et al.
Oswin, "Superior Cellophane Coatings Meet the Challenge of Plastics," TAPPI, vol. 57, No. 7, pp. 53-55, July, 1974.

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