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1. US7037959 - Biodegradable polymer compositions methods for making same and articles therefrom

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Claims
1. A polymer composition comprising:
a first component being an adipic polyester;
a second component being a natural polymer; and
a third component being a thermoplastic polyester, wherein the first component, second component and third component are combined to form the polymer composition.
2. A polymer composition as set forth in claim 1 wherein the natural polymer is starch.
3. A polymer composition as set forth in claim 2 wherein the starch is granular.
4. A polymer composition as set forth in claim 1 wherein the thermoplastic polyester is at least one of poly(lactic acid), cellulose acetate, polycaprolactone, polyhydroxy(butyrate-co-valerate)(PHBV), poly(butylene succinate adipate), poly(butylene succinate), aliphatic-aromatic copolymer, and poly(ethylene terphathalate)(PET).
5. A polymer composition as set forth in claim 1 wherein the second component is present in an amount up to about 74 wt. %.
6. A polymer composition as set forth in claim 1 wherein the first component is present in an amount up to about 40 wt. %.
7. A polymer composition as set forth in claim 1 wherein the third component is present in an amount up to about 80 wt. %.
8. A polymer composition as set forth in claim 1 including a fourth component being at least one of an external lubricant, nucleating agent and plasticizer.
9. A polymer composition as set forth in claim 1 wherein the natural polymer has a moisture content of less than about 15 wt. %.
10. A polymer composition as set forth in claim 1 wherein the polymer composition is biodegradable.
11. A polymer composition as set forth in claim 1 wherein the polymer composition is processed into an article that keeps its shape at temperatures of up to and more than about 100° C.
12. A polymer composition as set forth in claim 1 wherein the polymer composition is annealed to increase high temperature stability.
13. A polymer composition comprising:
a first component being a hydroxy-functional polymer;
a second component being a natural polymer; and
a third component being a thermoplastic polyester, wherein the first component, second component and third component are combined to form the polymer composition and wherein the hydroxy-functional polymer is a poly(hydroxy ester ether)(PHEE)in an amount of about 1 wt. %.
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