Production of biologically degradable films

Details Production of biologically degradable films Production of biologically degradable films

1990-10-04

1992-07-28

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

Coated particles

47 9, 260DIG43, 264 13, 264118, 264121, 264134, 264211, 264349, 525938, 427214, 427414, 427417, B29B 900, B29C 4702, B29L 700

Patent

active

051339099

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 in an aqueous suspension by means of enzymes that 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 the 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 are separated from the suspension to remove small molecules after which the particles are re-dried and then pulverized. The final film is prepared in a film extruder in which the biopolymer is mixed with the synthetic polymer and possibly other additives that are generally used informing polymer films.

REFERENCES:
patent: 3907726 (1975-09-01), Tomiyama
patent: 3909468 (1975-09-01), Tanaka et al.
patent: 3952347 (1976-04-01), Comerford et al.
patent: 4021388 (1977-05-01), Griffin
patent: 4207221 (1980-06-01), Tobias et al.
patent: 5003022 (1991-03-01), Nguyen et al.

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