EP0416624A2
Expired / Lapsed
EP
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Biodegradable or biocompatible copolymer and production process thereof
Assignee: Resonac Holdings Corp
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Filing: 1990-09-06
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Granted: —
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Expires: 2010-09-06
Abstract
Abstract A copolymer comprising, as recurring units, (A) 1 to 99 mole% of one or more 3-hydroxyalkanoate unit having the formula (I): wherein m represents an integer of 0 or 1 to 8 and (B) 1 to 99 mole% of one or more 3-hydroxy-halogenated alkanoate unit having the following formula (II): wherein X represents a halogen atom and n represents an integer of 2 to 8 and wherein the total of the unit (A) and the unit (B) is 100 mole%, and having a weight average molecular weight within the range of from 10,000 to 1,500,000.
Inventors
- 👤 Yoshiharu Doi
- 👤 Yuichi C/O Showa Denko K.K. Fusho
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 11:11
CPC Classifications
C; C12; C12P; C12P7/00; C12P7/62; C12P7/625; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6822
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
A copolymer comprising, as recurring units, (A) 1 to 99 mole% of at least one 3-hydroxyalkanoate unit having the formula (I): wherein m represents an integer of 0 or 1 to 8 and (B) 1 to 99 mole% of at least one 3-hydroxy-halogenated alkanoate unit having the formula (II): wherein X represents halogen and n represents an integer of 2 to 8 and wherein the total of the unit (A) and the unit (B) is 100 mole% and having a weight average molecular weight within the range of from 10,000 to 1,500,000.
Claim 2
Dependent Claim
92 words
A copolymer comprising, as recurring units, (A) 1 to 99 mole% of at least one 3-hydroxyalkanoate unit having the formula (I): wherein m represents an integer of 0 or 1 to 8 and (B) 1 to 99 mole% of at least one 3-hydroxy-halogenated alkanoate unit having the formula (II): wherein X represents halogen and n represents an integer of 2 to 8 and wherein the total of the unit (A) and the unit (B) is 100 mole% and having a weight average molecular weight within the range of from 10,000 to 1,500,000.
Claim 3
Dependent Claim
28 words
A copolymer as claimed in claim 1, wherein the copolymer comprises 20 to 95 mole% of the unit (A) and 5 to 80 mole% of the unit (B).
Claim 4
Dependent Claim
20 words
A copolymer as claimed in claim 1, wherein the weight average molecular weight of the copolymer is 100,000 to 1,000,000.
Claim 5
Dependent Claim
130 words
A process for producing a copolymer according to claim 1, which comprises culturing a microorganism capable of producing a poly-3-hydroxyalkanoate under at least one restricted condition of the addition amounts of nitrogen and phosphorus and the aeration amount in the presence of a compound having the following formula (III); or compounds having the formula (III) and (IV): CH₂X(CH₂) p Y (III) CH₃(CH₂) r Z (IV) wherein X represents a halogen atom; Y and Z each independently represent hydrogen, halogen, hydroxyl or carboxyl or a metal salt thereof with a 1 to 4-valent metal atom, or a lower alkyl ester thereof; and p and r each independently represent an integer of 5 to 10, to form and accumulate the poly-3-hydroxy-alkanoate within the microorganism cells, followed by recovering the poly-3-hydroxyalkanoate thus produced.
Claim 6
Dependent Claim
16 words
A process as claimed in claim 4, wherein said microorganism belongs to the genus Pseudomonas .
Claim 7
Dependent Claim
30 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.
Claim 8
Dependent Claim
32 words
A process as claimed in claim 4, wherein the concentration of the compound (III) or a mixture of the compounds (III) and (IV) is 0.1 to 20% w/v in the culture medium.
Claim 9
Dependent Claim
37 words
A process as claimed in claim 4, wherein the addition amount of nitrogen or phosphorus is restricted, after the logarithmic proliferation is effected, such that an OD₆₆₀ of the culture medium or liquid is 20 to 30.
Claim 10
Dependent Claim
35 words
A process as claimed in claim 4, wherein the aeration amount is restricted, after the logarithmic proliferation is effected, such that the dissolved oxygen content is 1 to 60% of the saturation value for air.
References Cited (Backward Citations)
No citation records indexed.
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