Cellulose acetate and starch based biodegradable injection molded plastics compositions and methods of manufacture
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United States of America Patent
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Feb 22, 1994
Grant Date -
N/A
app pub date -
Jul 1, 1993
filing date -
Jul 1, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and composition are provided for making biodegradable injection ded parts from 30% to 70% cellulose acetate, 10% to 60% unmodified raw (whole) starch and 5% to 35% plasticizer including glycerols and glycerol acetates. Other ingredients that can be used include: starch, flour and paper acetates; gelatin; boric acid; and agricultural fillers. The solid ingredients are combined and fed to an extruder used to make pellets or to feed injection molding equipment. The resulting parts are clear to white or colorful depending upon the added filler materials. The plastics formed are water resistant, high strength and biodegradable.
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