US5401778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biodegradable plastic composition and biodegradable plastic shaped body
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1993-04-07
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Granted: 1995-03-28
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Expires: 2013-04-07
Abstract
Abstract A biodegradable plastic composition for forming biodegradable shaped bodies which includes a poly-β-hydroxybutyrate having a viscosity of n A at 185° C. and a polycaprolactone having a viscosity of n B at 185° C., wherein the poly-β-hydroxybutyrate is present in an amount C A of 10-45 or 55-85% by weight based on the total weight of the poly-β-hydroxybutyrate and the polycaprolactone, and wherein n A , n B and C A satisfy the following condition: 4×10.sup.-3 ×C.sub.A -1.7≦log (n.sub.A /n B )≦4×10 -3 ×C A -1.3.
Inventors
- 👤 Yutaka Tokiwa
- 👤 Akira Iwamoto
- 👤 Masahiro Harada
- 👤 Shigeki Imagawa
- 👤 Teizi Urakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:17
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
A biodegradable plastic composition consisting essentially of a poly-β-hydroxybutyrate having a viscosity of n A at 185° C. and a polycaprolactone having a viscosity of n B at 185° C., said poly-β-hydroxybutyrate being present in an amount of C A % by weight based on the total weight of said poly-β-hydroxybutyrate and said polycaprolactone, wherein C A falls within the range of 10-85 but does not fall within the range of 45-55 and wherein C A , n A and n B satisfy the following condition: 4×10.sup.-3 ×C.sub.A -1.7≦log (n.sub.A /n.sub.B)≦4×10.sup.-3 ×C.sub.A -1.3.
Claim 2
Dependent Claim
93 words
A biodegradable plastic composition consisting essentially of a poly-β-hydroxybutyrate having a viscosity of n A at 185° C. and a polycaprolactone having a viscosity of n B at 185° C., said poly-β-hydroxybutyrate being present in an amount of C A % by weight based on the total weight of said poly-β-hydroxybutyrate and said polycaprolactone, wherein C A falls within the range of 10-85 but does not fall within the range of 45-55 and wherein C A , n A and n B satisfy the following condition: 4×10.sup.-3 ×C.sub.A -1.7≦log (n.sub.A /n.sub.B)≦4×10.sup.-3 ×C.sub.A -1.3.
Claim 3
Dependent Claim
15 words
A composition according to claim 1, wherein C A is in the range of 20-80.
Claim 4
Dependent Claim
15 words
A composition according to claim 1, wherein C A is in the range of 30-75.
Claim 5
Dependent Claim
13 words
A biodegradable plastic shaped body formed of a composition according to claim 1.
Claim 6
Dependent Claim
14 words
A biodegradable composition according to claim 1 in the form of a homogeneous melt.
References Cited (Backward Citations)
US5124371A
Cited
EP0534471A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-27 | 1998-09-26 | 1999-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-27 | 2002-09-26 | 2003-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-27 | 2006-09-26 | 2007-03-28 | $7700.00 | Window Closed / Lapsed |