EP0440165A2
Expired / Lapsed
EP
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Biodegradable or biocompatible copolymer and process for producing same
Assignee: Resonac Holdings Corp
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Filing: 1991-01-29
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Granted: —
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Expires: 2011-01-29
Abstract
Abstract A random copolymer comprising, as repeating units, (i) 50 to 97 mol% of 3-hydroxybutyrate unit (3HB) having the formula (I): (ii) 1 to 25 mol% of 3-hydroxyvalerate unit (3HV) having the formula (II): (iii) 1 to 15 mol% of 3-hydroxypropionate unit (3HP) having the formula (III): - OCH₂ CH₂ CO - (III) and (iv) 1 to 10 mol% of 5-hydroxyvalerate unit (5HV) - OCH₂ CH₂ CH₂ CH₂ CO - (IV) wherein the total of the units 3HB, 3HV, 3HP and 5HV is 100 mol%, and having a weight average molecular weight within the range of from 10,000 to 2,500,000.
Inventors
- 👤 Atsuo Showa Denko K.K. Cent. Res. Lab. Nishimura
- 👤 Mamoru Showa Denko K.K. Cent. Res. Lab. Imanaka
- 👤 Hiromi C/O Showa Denko K.K. Niitsu
- 👤 Masaaki C/O Showa Denko K.K. Nishioka
- 👤 Katsuhiko C/O Showa Denko K.K. Gotoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 20:54
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C12; C12P; C12P7/00; C12P7/62; C12P7/625
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
A random copolymer comprising, as repeating units, (i) 50 to 97 mol% of 3-hydroxybutyrate unit (3HB) having the formula (I): (ii) 1 to 25 mol% of 3-hydroxyvalerate unit (3HV) having the formula (II): (iii) 1 to 15 mol% of 3-hydroxypropionate unit (3HP) having the formula (III): - OCH₂ CH₂ CO - (III) and (iv) 1 to 10 mol% of 5-hydroxyvalerate unit (5HV) having the formula (IV): - OCH₂ CH₂ cH₂ CH₂ CO - (IV) wherein the total of the units 3HB, 3HV, 3HP and 5HV 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
41 words
A random copolymer as claimed in claim 1, wherein the copolymer comprises (i) 65 to 97 mol% of 3HB, (ii) 1 to 20 mol% of 3HV, (iii) 1 to 10 mol% of 3HP, and (iv) 1 to 5 mol% of 5HV.
Claim 3
Dependent Claim
24 words
A random copolymer as claimed in claim 1 or 2, wherein the weight average molecular weight of the random copolymer is 100,000 to 1,500,000.
Claim 4
Dependent Claim
93 words
A process for producing a random copolymer according to any of the claims 1 to 3, comprising culturing a microorganism capable of producing a polyhydroxyalkanoate under at least one restricted condition of the amounts of nitrogenous and phosphorous source in the presence of at least one component selected from the group consisting of δ-valerolactone, 1,5-pentanediol and mono- and bis-carboxylic acid esters of 1,5-pentanediol, to form and accumulate a random copolymer comprising 3-hydroxybutyrate units (3HB), 3-hydroxyvalerate units (3HV), 3-hydroxypropionate units (3HP) and 5-hydroxyvalerate units (5HV) within the microorganism cells, followed by recovering the same.
Claim 5
Dependent Claim
16 words
A process as claimed in claim 4, wherein said microorganism belongs to the genus Alcaligenes .
Claim 6
Dependent Claim
39 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 aquamarinus and Alcaligenes eutrophus .
Claim 7
Dependent Claim
35 words
A process as claimed in any of the claims 4 to 6, wherein said culturing is aerobically effected under the conditions of a temperature of 20 to 40°C and a pH of 6 to 10.
References Cited (Backward Citations)
No citation records indexed.
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