Moisture barrier material comprising a thermoplastic and a compa

Details Moisture barrier material comprising a thermoplastic and a compa Moisture barrier material comprising a thermoplastic and a compa

1997-09-16

1999-03-16

Szekely, Peter A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

426112, 426392, 426410, 426415, C08L 516, B65D 8572, B65B 5500

Patent

active

058831614

ABSTRACT:
A moisture vapor barrier film composition can comprise a thermoplastic web comprising a thermoplastic polymer and a dispersed cyclodextrin composition having substituents that compatibilize the cyclodextrin in the film. The thermoplastic/cyclodextrin film obtains substantial barrier properties from the interaction between the substituted cyclodextrin in the film material with a water permeant. The substituents on the cyclodextrin molecule causes the cyclodextrin to be dispersible and stable in the film material resulting in an extrudable thermoplastic. Such materials can be used as a single layer film material, a multilayer film material which can be coated or uncoated and can be used in structural materials wherein the thermoplastic is of substantial thickness resulting in structural stiffness. The cooperation between the cyclodextrin and the thermoplastic polymer provides barrier properties to a web wherein a permeant can be complexed or entrapped by the cyclodextrin compound and held within the film preventing the moisture vapor permeant from passing through the film into the interior of a film, an enclosure or container.

REFERENCES:
patent: 5492947 (1996-02-01), Wood et al.
patent: 5603974 (1997-02-01), Wood et al.

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