US5115000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biodegradable starch plastics incorporating modified polyethylene
Assignee: Iowa State University Research Foundation Inc
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Filing: 1990-06-19
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Granted: 1992-05-19
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Expires: 2010-06-19
Abstract
Abstract A composition is disclosed for a biodegradable, blendable plastic having improved tensile strength. It consists of starch, oxidized polyethylene, and polyethylene. The starch is included in an amount up to 50% by weight, the oxidized polyethylene up to 15% by weight, and the remaining amount is polyethylene. It is preferred that high molecular weight oxidized polyethylene be used and in the method of producing the composition, it is preferred that the blending of the components occur at a temperature range of 110 DEG C. to 200 DEG C.
Inventors
- 👤 Jay-lin Jane
- 👤 Alan W. Schwabacher
- 👤 Sam N. Ramrattan
- 👤 Jeffrey A. Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:14
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L3/00; C08L3/02; C08L2201/00; C08L2201/06; C08L2205/00; C08L2205/03; C08L23/26; C08L23/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
37 words
A blended, high tensile strength, biodegradable plastic composition comprising a starchy material, oxidized polyethylene and unmodified polyethylene the ratio of said starchy material to said oxidized polyethylene being within the range of 1:1 up to about 3.3:1.
Claim 2
Dependent Claim
37 words
A blended, high tensile strength, biodegradable plastic composition comprising a starchy material, oxidized polyethylene and unmodified polyethylene the ratio of said starchy material to said oxidized polyethylene being within the range of 1:1 up to about 3.3:1.
Claim 3
Dependent Claim
23 words
The composition of claim 1 wherein the starchy material is selected from the group consisting of unmodified starch, modified starch, amylose and amylopectin.
Claim 4
Dependent Claim
18 words
The composition of claim 1 wherein the starchy material comprises up to 50% by weight of the composition.
Claim 5
Dependent Claim
20 words
The composition of claim 3 wherein the starchy material comprises 6% by weight to 15% by weight of the composition.
Claim 6
Dependent Claim
15 words
The composition of claim 1 wherein the oxidized polyethylene is a high molecular weight polyethylene.
Claim 7
Dependent Claim
20 words
The composition of claim 5 wherein the oxidized polyethylene has a molecular weight of more than 5000 grams per mole.
Claim 8
Dependent Claim
18 words
The composition of claim 1 wherein the oxidized polyethylene comprises up to 15% by weight of the composition.
Claim 9
Dependent Claim
24 words
The composition of claim 1 wherein the ratio of starchy material to oxidized polyethylene is in the range of 1:1 up to about 3.3:1.
Claim 10
Dependent Claim
16 words
The composition of claim 1 wherein the ratio of starchy material to oxidized polyethylene is 1:1.
Claim 11
Dependent Claim
43 words
The composition of claim 1 wherein the starchy material is 6% by weight to 15% by weight of the composition, the oxidized polyethylene is 6% by weight to 15% by weight of the composition and the remaining amount of the composition is polyethylene.
Claim 12
Dependent Claim
59 words
A blendable high tensile strength composition for biodegradable films comprising: a granular starchy material; polyethylene in an amount sufficient to increase tensile strength and blendability; and oxidized polyethylene in an amount sufficient to improve binding to the starch and tensile strength the ratio of starchy material to oxidized polyethylene being within the range of 1:1 up to about 3.3:1.
Claim 13
Dependent Claim
59 words
A blendable high tensile strength composition for biodegradable films comprising: a granular starchy material; polyethylene in an amount sufficient to increase tensile strength and blendability; and oxidized polyethylene in an amount sufficient to improve binding to the starch and tensile strength the ratio of starchy material to oxidized polyethylene being within the range of 1:1 up to about 3.3:1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |