US5162392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection moldable biodegradable starch polymer composite
Assignee: Agri-Tech Industries Inc
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Filing: 1990-11-13
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Granted: 1992-11-10
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Expires: 2010-11-13
Abstract
Abstract An injection moldable biodegradable plastic formed of corn starch and low-density polyethylene. Ethylene acrylic acid co-polymer can be included in proportions ranging from 0-10%, by weight, and sodium hydroxide can be utilized to neutralize the acidic portions of the ethylene acrylic acid co-polymer. When no ethylene acrylic acid co-polymer is utilized, glycerol is added. To improve injection molding characteristics, the ethylene acrylic acid co-polymer and polyethylene are premixed before the addition of corn starch.
Inventors
- 👤 Richard P. Wool
- 👤 David C. Schiltz
- 👤 Dale Steiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:05
CPC Classifications
C; C08; C08L; C08L3/00; C08L3/02; B; B29; B29C; B29C45/00; B29C45/0001; C08L23/00; C08L23/02; C08L23/04; C08L23/06; B29K; B29K2995/00; B29K2995/0037; B29K2995/0059
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
33 words
A biodegradable injection moldable plastic consisting essentially of about 40-50% by weight polyethylene, about 40-45% by weight starch, unneutralized ethylene acrylic acid copolymer between about 3-9% by weight and the balance a lubricant.
Claim 2
Dependent Claim
33 words
A biodegradable injection moldable plastic consisting essentially of about 40-50% by weight polyethylene, about 40-45% by weight starch, unneutralized ethylene acrylic acid copolymer between about 3-9% by weight and the balance a lubricant.
Claim 3
Dependent Claim
26 words
The biodegradable plastic as defined in claim 1 wherein said lubricant is selected from the group consisting of polyethylene glycol, corn oil and linseed oil lubricant.
Claim 4
Dependent Claim
61 words
A biodegradable injection molded plastic consisting essentially of about 40-50% polyethylene by weight, about 40-45% by weight starch, unneutralized ethylene acrylic acid copolymer between about 3-9% by weight wherein said ethylene acrylic acid copolymer has a melt index of at least about 300 and the balance being a lubricant in place of a neutralizing agent for said ethylene acrylic acid copolymer.
Claim 5
Dependent Claim
61 words
A biodegradable injection molded plastic consisting essentially of about 40-50% polyethylene by weight, about 40-45% by weight starch, unneutralized ethylene acrylic acid copolymer between about 3-9% by weight wherein said ethylene acrylic acid copolymer has a melt index of at least about 300 and the balance being a lubricant in place of a neutralizing agent for said ethylene acrylic acid copolymer.
Claim 6
Dependent Claim
36 words
A biodegradable injection molded plastic consisting essentially of about 40-50% polyethylene by weight, about 40-45% by weight starch, unneutralized ethylene acrylic acid copolymer between about 3-9% by weight and the balance being a linseed oil lubricant.
Claim 7
Dependent Claim
36 words
A biodegradable injection molded plastic consisting essentially of about 40-50% polyethylene by weight, about 40-45% by weight starch, unneutralized ethylene acrylic acid copolymer between about 3-9% by weight and the balance being a linseed oil lubricant.
References Cited (Backward Citations)
US4337181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-10 | 1996-05-11 | 1996-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-10 | 2000-05-11 | 2000-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-10 | 2004-05-11 | 2004-11-10 | $7700.00 | Window Closed / Lapsed |