Patent US5227415A successfully refreshed from Google Patents.
US5227415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biodegradable plastic composition
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1991-03-12
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Granted: 1993-07-13
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Expires: 2011-03-12
Abstract
Abstract A biodegradable plastic composition for use in production of shaped articles includes polyglycolide and a high molecular weight substance selected from poly(3-hydroxybutyric acid), a copolymer of 3-hydroxybutyric acid and 3-hydroxyvaleric acid, polycaprolactone, polyglutamic acid, polyolefin, polyvinyl alcohol, polyalkylene oxide, cellulose acetate and mixtures thereof, the amount of the polyglycolide being 5-60 % based on the total weight of the polyglycolide and the high molecular weight substance.
Inventors
- 👤 Takashi Masuda
- 👤 Akio Matsuda
- 👤 Kazuhisa Murata
- 👤 Shinsuke Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:54
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/04; C08L101/00; C08L2201/00; C08L2201/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A biodegradable plastic blend composition comprising polyglycolide having a number average molecular weight of 500-2000 and a high molecular weight substance selected from the group consisting of poly(3-hydroxybutyric acid) and a copolymer of 3-hydroxybutyric acid and 3-hydroxyvaleric acid, said polyglycolide being present in an amount of 5-60% based on the total weight of said polyglycolide and said high molecular weight substance.
Claim 2
Dependent Claim
61 words
A biodegradable plastic blend composition comprising polyglycolide having a number average molecular weight of 500-2000 and a high molecular weight substance selected from the group consisting of poly(3-hydroxybutyric acid) and a copolymer of 3-hydroxybutyric acid and 3-hydroxyvaleric acid, said polyglycolide being present in an amount of 5-60% based on the total weight of said polyglycolide and said high molecular weight substance.
Claim 3
Dependent Claim
40 words
A shaped article obtained by a method comprising the steps of providing a biodegradable plastic composition according to claim 1, heating said composition to a temperature sufficient to melt said composition, and molding said melted composition into a desired shape.
Claim 4
Dependent Claim
16 words
The composition as claimed in claim 1 wherein said high molecular weight substance is poly(3-hydroxybutyric acid).
Claim 5
Dependent Claim
31 words
The composition as claimed in claim 1 wherein said polyglycolide is present in the amount of 10-50% based on the total weight of said polyglycolide and said high molecular weight substance.
Claim 6
Dependent Claim
31 words
The composition as claimed in claim 3 wherein said polyglycolide is present in the amount of 10-50% based on the total weight of said polyglycolide and said high molecular weight substance.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |