US4863655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biodegradable packaging material and the method of preparation thereof
Assignee: Brunob II BV
•
Filing: 1988-12-30
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Granted: 1989-09-05
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Expires: 2008-12-30
Abstract
Abstract A biodegradable packaging material comprising an expanded high amylose starch product having at least 45% by weight amylose content, said expanded product having a low density, closed cell structure with good resilience and compressibility. Another embodiment provides a method of preparing a low density, biodegradable packaging material comprising extruding a starch having at least 45% by weight amylose content, in the presence of a total moisture content of 21% or less by weight, at a temperature of from 150 DEG to 250 DEG C.
Inventors
- 👤 Norman L. Lacourse
- 👤 Paul A. Altieri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:19
CPC Classifications
C; C08; C08L; C08L3/00; C08L3/12; B; B29; B29C; B29C44/00; B29C44/34; B29C44/3402; C08B; C08B30/00; C08B30/20; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
46 words
A method of preparing an expanded, biodegradable, low-density packaging material comprising extruding starch containing at least 45% by weight amylose content in the presence of a total moisture content of 21% or less by weight and at a temperature of from about 150° to 250° C.
Claim 2
Independent Claim
46 words
A method of preparing an expanded, biodegradable, low-density packaging material comprising extruding starch containing at least 45% by weight amylose content in the presence of a total moisture content of 21% or less by weight and at a temperature of from about 150° to 250° C.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein said starch contains at least 65% by weight of amylose.
Claim 4
Dependent Claim
37 words
The method of claim 2 wherein said extruder is a twin-screw extruder and the temperature is maintained in at least the section of the extruder closest to the die and just before the material leaves the extruder.
Claim 5
Dependent Claim
29 words
The method of claim 3 wherein the total moisture content is from about 13 to 19% by weight and the temperature is from about 160° C. to 210° C.
Claim 6
Dependent Claim
20 words
The method of claim 4 wherein the starch is modified with up to about 10% by weight of propylene oxide.
Claim 7
Dependent Claim
26 words
The method of claim 2 wherein the starch is modified with up to about 15% by weight of alkylene oxide containing 2 to 6 carbon atoms.
Claim 8
Dependent Claim
28 words
The method of claim 6 wherein the total moisture content is from about 13 to 19% by weight and the temperature is from about 160° to 210° C.
Claim 9
Dependent Claim
20 words
The method of claim 7 wherein the starch is modified with up to about 10% by weight of propylene oxide.
Claim 10
Dependent Claim
20 words
The method of claim 8 wherein up to about 10% by weight of polyvinyl alcohol is added to the starch.
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |