Method of making polymer compositions containing...

Details Method of making polymer compositions containing... Method of making polymer compositions containing...

2005-01-18

2005-01-18

Lipman, Bernard (Department: 1713)

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

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S047000, C524S051000, C524S053000, C524S388000

Reexamination Certificate

active

06844380

ABSTRACT:
There is provided a method of preparing a thermoplastic starch and synthetic polymer blend, said method comprising the steps of: (a) providing a starch suspension comprising starch, water and a plasticizer, preferably glycerol; (b) obtaining a thermoplastic starch from the starch suspension by causing gelatinization and plasticization of said starch suspension by exerting heat and pressure on said starch suspension in a first extrusion unit; (c) evaporating and venting off residual water from said thermoplastic starch to obtain a substantially moisture-free thermoplastic starch; (d) obtaining a melt of a synthetic polymer or polymer blend in a second extrusion unit; and (e) combining the melt obtained from step (d) with the substantially moisture-free thermoplastic starch. Also provided are compositions of matter comprising immiscible blends of thermoplastic starches, polymers, and compatibilizers.

REFERENCES:
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patent: 6191196 (2001-02-01), Willett
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patent: WO 9014388 (1990-11-01), None
Otey et al. “Starch-Based Blown Films”, Ind. Eng. Chem. Prod. Res. Dev., 19:592-595 (1980).
St-Pierre et al., “Processing and characterization of thermoplastic starch/polyethylene blends”, Polymer, 38/3:647-655 (1977).

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