US5138029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biodegradable or biocompatible copolymer and process for producing same
Assignee: Resonac Holdings Corp
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Filing: 1991-07-03
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Granted: 1992-08-11
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Expires: 2011-07-03
Abstract
Abstract A random copolymer comprising, as repeating units, (i) 20 to 90 mol % of 3-hydroxybutyrate unit (3HB) having the formula (I): ##STR1## (ii) 5 to 70 mol % of 3-hydroxyvalerate unit (3HV) having the formula (II): ##STR2## and (iii) 1 to 15 mol % of 4-hydroxyvalerate unit (4HV) having the formula (III): ##STR3## wherein the total of the units 3HB, 3HV, and 4HV is 100 mol %, and having a weight average molecular weight within the range of from 10,000 to 2,500,000 and a production process thereof.
Inventors
- 👤 Masaaki Nishioka
- 👤 Hidemitsu Takinishi
- 👤 Shiro Fukuyama
- 👤 Atsuo Nishimura
- 👤 Hiromi Niitsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:27
CPC Classifications
C; C12; C12P; C12P7/00; C12P7/62; C12P7/625; C08; C08G; C08G63/00; C08G63/02; C08G63/06; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/829
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
82 words
A random copolymer comprising, as repeating units, (i) 20 to 90 mol % of 3-hydroxybutyrate unit (3HB) having the formula (I): ##STR8## and (ii) 5 to 70 mol % of 3-hydroxyvalerate unit (3HV) having the formula (II): ##STR9## (iii) 1 to 15 mol % of 4-hydroxyvalerate unit (4HV) having the formula (III): ##STR10## wherein the total of the units 3HB, 3HV, and 4HV is 100 mol %, and having a weight average molecular weight within the range of from 10,000 to 2,500,000.
Claim 2
Dependent Claim
82 words
A random copolymer comprising, as repeating units, (i) 20 to 90 mol % of 3-hydroxybutyrate unit (3HB) having the formula (I): ##STR8## and (ii) 5 to 70 mol % of 3-hydroxyvalerate unit (3HV) having the formula (II): ##STR9## (iii) 1 to 15 mol % of 4-hydroxyvalerate unit (4HV) having the formula (III): ##STR10## wherein the total of the units 3HB, 3HV, and 4HV is 100 mol %, and having a weight average molecular weight within the range of from 10,000 to 2,500,000.
Claim 3
Dependent Claim
37 words
A random copolymer as claimed in claim 1, wherein the copolymer comprises (i) 20 to 85 mol % of 3HB, (ii) 13 to 65 mol % of 3HV, and (iii) 2 to 15 mol % of 4HV.
Claim 4
Dependent Claim
22 words
A random copolymer as claimed in claim 1, wherein the weight average molecular weight of the random copolymer is 100,000 to 1,500,000.
Claim 5
Dependent Claim
56 words
A process for producing a random copolymer according to claim 1, comprising culturing a microorganism in the presence of at τ-valerolactone to form and accumulate a random copolymer comprising 3-hydroxybutyrate units (3HB), 3-hydroxyvalerate units (3HV), and 4-hydroxyvalerate units (4HV) within the microorgani cells, followed by recovering the same wherein said microorganism belongs to the genus Alcaligenes.
Claim 6
Dependent Claim
35 words
A process as claimed in claim 4, wherein said microorganism is at least one member selected from the group consisting of those belonging to Alcaligenes facecalis, Alcaligenes ruhlandii, Alcaligenes latus, Alcaligenes aguamarinus and Alcaligenes eutrophus.
Claim 7
Dependent Claim
31 words
A process as claimed in claim 4, wherein said culturing is aerobically effected under the conditions of a temperature of 20° to 40° C. and a pH of 6 to 10.
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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) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |