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EP0601885A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Biodegradable optically active polymer of lactones and process for production thereof

Assignee: Takasago International Corp
•
Filing: 1993-12-10
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Granted: —
•
Expires: 2013-12-10
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Abstract

Abstract Novel polymers are represented by general formula (I) : wherein R 1 represents tetramethylene, methyltetramethylene, pentamethylene, 1,4-dimethyl-2-oxo-3- oxytetramethylene, 2-oxo-3-oxytetramethylene or 2-methyl-3-oxypentamethylene, and m and n each represents a natural number of from 10 to 15,000. Preferably the ratio of units (III) to (IV) is 99 :1 to 1 :99 and the weight average molecular weight is 8,000 to 1,000,000. Industrial production is by subjecting optically active β-butyrolactone and a six- or seven-membered lactone to ring-opening copolymerization in the presence of a catalyst, preferably a distannoxane. The polymers have optical activity, biodegradability (e.g. enzymatic), and hydrolyzability.

Inventors

  • 👤 Yoji C/O Takasago Int. Corporation Hori
  • 👤 Akio C/O Takasago Int. Corporation Yamaguchi

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-23 20:13
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/08; C08G63/66; C08G63/664; C08G63/78; C08G63/82; C08G63/823

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 42 words
A biodegradable, optically active polymer represented by general formula (I) : wherein R 1 represents a group selected from tetramethylene, methyltetramethylene, pentamethylene, 1,4-dimethyl-2-oxo-3-oxytetramethylene, 2-oxo-3-oxytetramethylene, and 2-methyl- 3-oxypentamethy- lene, and m and n each represents a natural number of from 10 to 15,000.
Claim 2
Dependent Claim 42 words
A biodegradable, optically active polymer represented by general formula (I) : wherein R 1 represents a group selected from tetramethylene, methyltetramethylene, pentamethylene, 1,4-dimethyl-2-oxo-3-oxytetramethylene, 2-oxo-3-oxytetramethylene, and 2-methyl- 3-oxypentamethy- lene, and m and n each represents a natural number of from 10 to 15,000.
Claim 3
Dependent Claim 32 words
A biodegradable, optically active polymer as claimed in Claim 1, wherein the ratio of the structural units (III) to the structural units (IV) is in the range of from 99:1 to 1:99.
Claim 4
Dependent Claim 23 words
A biodegrable, optically active polymer as claimed in Claim 1 or 2, which has a weight-average molecular weight of from 8,000 to 1,000,000.
Claim 5
Dependent Claim 38 words
A process for producing the biodegradable, optically active polymer as claimed in Claim 1, 2 or 3, which comprises subjecting optically active β-butyrolactone and a six- or seven-membered lactone to ring-opening copolymerization in the presence of a catalyst.
Claim 6
Dependent Claim 26 words
A process as claimed in Claim 4, wherein the catalyst is selected from a tin compound, an aluminum compound, a zinc compound and a distannoxane catalyst.
Claim 7
Dependent Claim 70 words
A process as claimed in Claim 5, wherein the catalyst is a distannoxane catalyst represented by general formula (II) : wherein R 2 represents either an alkyl group having from 1 to 4 carbon atoms or a phenyl group, X is selected from Cl, Br and NCS, and Y is selected from Cl, Br, NCS, OH, an alkoxy group having from 1 to 4 carbon atoms and a phenoxy group.

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