Biologically degradable plant cover film and method of preparing

Details Biologically degradable plant cover film and method of preparing Biologically degradable plant cover film and method of preparing

1990-10-04

1992-06-02

Michl, Paul R.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523124, 524 17, 524 47, 435 99, 435202, 435204, 435209, 435210, 435219, 435222, 435822, 435836, 435945, C08L 2302, C08L 302

Patent

active

051187256

ABSTRACT:
A biologically degradable film is prepared consisting of a synthetic polymer and a biologically degradable polymer. The biologically degradable polymer is divided into small particles by means of enzymes produced by microbes in the form of spores, which enzymes split and release small molecules from the surface of the biopolymer particles. After achieving desired particle size, an emulsion is formed with vegetable oil and particles coated with enzyme protein become coated with vegetable oil, which at the same time interrupts the degradation of the biopolymer particles by the enzyme. The coated particles with the oil is separated from the suspension to remove small molecules after which the particles are redried and then pulverized. The final film is prepared in a film extruder in which the biopolymer is mixed with the synthetic polymer and possibly with other additives that are generally used in forming polymer films. The invention also relates to the films produced by the method, which films contain microbes in the form of spores.

REFERENCES:
patent: 3988411 (1976-10-01), Capozza
patent: 4477655 (1984-10-01), Holmes
patent: 4931488 (1990-06-01), Chiquet
patent: 4983651 (1991-01-01), Griffin
patent: 4985082 (1991-01-01), Whistler
patent: 4999417 (1991-03-01), Domb

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