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US 8,772,378 B2Granted
Thermoplastic starch compositions
AssigneeThe Procter & Gamble Company
InventorsNorman Scott Broyles, Pier-Lorenzo Caruso, Emily Charlotte Boswell, Robert Earl Magness, Ludwig Busam, Jörg Harren, Laurent Wattebled
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Abstract
The present invention relates to improvements in prevention of discoloration of thermoplastic starch materials and their blends with other thermoplastic materials.
Claims16
A thermoplastic starch composition comprising,
- (a) from about 40% to about 96% starch, by weight of the thermoplastic starch composition;
- (b) from about 1% to 40% plasticizer, by weight of the thermoplastic starch composition;
- and
- (c) from about 0.01% to about 5% reducing agent, by weight of the thermoplastic starch composition;
- wherein said reducing agent has a redox potential of from about −50 mV to about −1200 mV;
- and
- said redox potential is measured in an aqueous solution at a temperature of about 80° C., wherein said aqueous solution comprises about 1% reducing agent, about 1% citric acid, and about 1% tribasic potassium citrate, by weight of the aqueous solution.
4 more elements
Dependencies are inferred from the claim text.