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US6806353B2
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Biodegradable plant protein composites and related methods
Assignee: Iowa State University Research Foundation Inc
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Filing: 2001-10-12
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Granted: 2004-10-19
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Expires: 2021-10-12
Abstract
Abstract A biodegradable plant protein composite is described. The composite includes a plant protein, which is preferably soy protein, and a polylactide. The composite also preferably includes a compatibilizer, a cross-linking agent, and a plasticizer. The composites of this invention offer the advantages of being water resistant and biodegradable.
Inventors
- 👤 Jinwen Zhang
- 👤 Perminus Mungara
- 👤 Jay-lin Jane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:16
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/04; C08L89/00; C08L47/00; C08L79/00
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
36 words
A non-toxic biodegradable plant protein composite, said composite comprising: 5 to 90 parts by weight soy protein; and 90 to 5 parts by weight of a polylactide, wherein said composite total does not exceed 100 parts.
Claim 2
Dependent Claim
36 words
A non-toxic biodegradable plant protein composite, said composite comprising: 5 to 90 parts by weight soy protein; and 90 to 5 parts by weight of a polylactide, wherein said composite total does not exceed 100 parts.
Claim 3
Dependent Claim
19 words
The plant protein composite of claim 1 wherein the composite includes at least 25% by weight of the polylactide.
Claim 4
Dependent Claim
19 words
The plant protein composite of claim 1 wherein the composite includes at least 50% by weight of the polylactide.
Claim 5
Dependent Claim
29 words
The plant protein composite of claim 1 further including a compatibilizer, said compatibilizer being selected from the group consisting of a poly(2-alkyl-2-oxazoline), a poly(2-phenyl-2-oxazoline), and an epoxy/hydroxyl functionalized polybutadiene.
Claim 6
Dependent Claim
21 words
The plant protein composite of claim 4 wherein the poly(2-alkyl-2-oxazoline) is selected from the group consisting of poly(2-methyl-2-oxazoline), poly(2-ethyl-2-oxazoline), and poly(2-propionyl-2-oxazoline).
Claim 7
Dependent Claim
12 words
The plant protein composite of claim 5 wherein the poly(2-alkyl-2-oxazoline) is poly(2-ethyl-2-oxazoline).
Claim 8
Dependent Claim
16 words
The plant protein composite of claim 4 wherein the composite contains 2 parts by weight compatibilizer.
Claim 9
Dependent Claim
13 words
The plant protein composite of claim 1 wherein the plant protein is acetylated.
Claim 10
Dependent Claim
12 words
The plant protein composite of claim 1 further including a cross-linking agent.
Claim 11
Dependent Claim
32 words
The plant protein composite of claim 9 wherein the cross-linking agent is selected from the group consisting of glutaric dialdehyde, epichlorohydrin, formaldehyde, glyoxal, adipic anhydride, acetic anhydride, zinc sulfate, and calcium chloride.
Claim 12
Dependent Claim
16 words
The plant protein composite of claim 10 wherein the cross-linking agent is glutaric dialdehyde or epichlorohydrin.
Claim 13
Dependent Claim
18 words
The plant protein composite of claim 10 which includes up to about 0.6 parts by weight glutaric dialdehyde.
Claim 14
Dependent Claim
17 words
The plant protein composite of claim 10 which includes up to about 0.4 parts by weight epichlorohydrin.
Claim 15
Dependent Claim
35 words
The plant protein composite of claim 1 which further includes a plasticizer, said plasticizer being selected from the group consisting of up to 50% by weight glycerol and up to 30% by weight propylene glycol.
Claim 16
Dependent Claim
13 words
The plant protein composite of claim 14 which includes 10-30% by weight glycerol.
Claim 17
Dependent Claim
14 words
The plant protein composite of claim 14 which includes 10-20% by weight propylene glycol.
Claim 18
Independent Claim
53 words
A method for making a biodegradable plant protein composite comprising: combining 5 to 90 parts by weight plant protein with 90 to 5 parts by weight polylactide to form a mixture; and extruding said mixture at a temperature sufficient to make the mixture extrudable; wherein said composite total does not exceed 100 parts.
Claim 19
Independent Claim
53 words
A method for making a biodegradable plant protein composite comprising: combining 5 to 90 parts by weight plant protein with 90 to 5 parts by weight polylactide to form a mixture; and extruding said mixture at a temperature sufficient to make the mixture extrudable; wherein said composite total does not exceed 100 parts.
Claim 20
Dependent Claim
12 words
The method of claim 17 wherein the plant protein is soy protein.
Claim 21
Dependent Claim
13 words
The method of claim 17 further comprising adding a compatibilizer to the mixture.
Claim 22
Dependent Claim
14 words
The method of claim 17 further comprising adding a cross-linking agent to the mixture.
Claim 23
Dependent Claim
13 words
The method of claim 17 further comprising adding a plasticizer to the mixture.
Claim 24
Dependent Claim
86 words
A non-toxic biodegradable plant protein composite comprising: soy protein; at least 25% by weight of a polylactide; up to 10 parts by weight of a compatibilizer, said compatibilizer being selected from the group consisting of a poly(2-alkyl-2-oxazoline) and a poly(2-phenyl-2-oxazoline); up to 0.6 parts by weight of a cross-linking agent, said cross-linking agent being selected from the group consisting of glutaric dialdehyde and epichlorohydrin; and up to 40% by weight of a plasticizer, said plasticizer being selected from the group consisting of glycerol and propylene glycol.
Claim 25
Dependent Claim
86 words
A non-toxic biodegradable plant protein composite comprising: soy protein; at least 25% by weight of a polylactide; up to 10 parts by weight of a compatibilizer, said compatibilizer being selected from the group consisting of a poly(2-alkyl-2-oxazoline) and a poly(2-phenyl-2-oxazoline); up to 0.6 parts by weight of a cross-linking agent, said cross-linking agent being selected from the group consisting of glutaric dialdehyde and epichlorohydrin; and up to 40% by weight of a plasticizer, said plasticizer being selected from the group consisting of glycerol and propylene glycol.
References Cited (Backward Citations)
US6214907B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-10-19 | 2008-04-19 | 2008-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-10-19 | 2012-04-19 | 2012-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-10-19 | 2016-04-19 | 2016-10-19 | $7700.00 | Window Closed / Lapsed |