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US5286842A
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Process for producing a biodegradable polymer
Assignee: MITSUBSIHI KASEI Corp
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Filing: 1992-06-30
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Granted: 1994-02-15
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Expires: 2012-06-30
Abstract
Abstract A process for producing a biodegradable polymer, which comprises subjecting a cyclic compound of the following formula (1) or (2) to ring opening polymerization: ##STR1## wherein R 1 is a C 1-10 alkyl group, ##STR2## wherein R 2 is a C 1-10 alkyl group, and R 3 is a hydrogen atom or a C 1-10 alkyl group.
Inventors
- 👤 Yoshiharu Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:58
CPC Classifications
C; C07; C07D; C07D321/00; C07D321/02; C07D321/04; C07D321/08; C07D323/00; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
57 words
A process for producing a biodegradable polymer, which comprises subjecting a cyclic compound of the following formula (1) or (2) to ring opening polymerization: ##STR8## wherein R 1 is a C 1-10 alkyl group, ##STR9## wherein R 2 is a C 1-10 alkyl group, and R 3 is a hydrogen atom or a C 1-10 alkyl group.
Claim 2
Dependent Claim
57 words
A process for producing a biodegradable polymer, which comprises subjecting a cyclic compound of the following formula (1) or (2) to ring opening polymerization: ##STR8## wherein R 1 is a C 1-10 alkyl group, ##STR9## wherein R 2 is a C 1-10 alkyl group, and R 3 is a hydrogen atom or a C 1-10 alkyl group.
Claim 3
Dependent Claim
17 words
A cyclic compound of the formula (1): ##STR10## wherein R 1 is a C 1-10 alkyl group.
Claim 4
Dependent Claim
17 words
A cyclic compound of the formula (1): ##STR10## wherein R 1 is a C 1-10 alkyl group.
Claim 5
Dependent Claim
53 words
A process for producing a cyclic compound of the formula (1): ##STR11## wherein R 1 is a C 1-10 alkyl group, which comprises cyclically trimerizing a compound of the formula (3): ##STR12## wherein R 1 is as defined above and R 4 is a C 1-10 alkyl group, by an ester exchange catalyst.
Claim 6
Dependent Claim
53 words
A process for producing a cyclic compound of the formula (1): ##STR11## wherein R 1 is a C 1-10 alkyl group, which comprises cyclically trimerizing a compound of the formula (3): ##STR12## wherein R 1 is as defined above and R 4 is a C 1-10 alkyl group, by an ester exchange catalyst.
Claim 7
Dependent Claim
30 words
A cyclic compound of the formula (2): ##STR13## wherein R 2 is a C 1-10 alkyl group, and R 3 is a hydrogen atom or a C 1-10 alkyl group.
Claim 8
Dependent Claim
30 words
A cyclic compound of the formula (2): ##STR13## wherein R 2 is a C 1-10 alkyl group, and R 3 is a hydrogen atom or a C 1-10 alkyl group.
Claim 9
Dependent Claim
116 words
A process for producing a cyclic compound of the formula (2): ##STR14## wherein R 2 is a C 1-10 alkyl group, and R 3 is a hydrogen atom or a C 1-10 alkyl group, Which comprises reacting a compound of the formula (4): HO--CHR.sub.2 --CH.sub.2 COOH (4) wherein R 2 is as defined above, with a compound of the formula (5): X--CHR.sub.3 --CO--Y (5) wherein R 3 is as defined above, and each of X and Y is a halogen atom, to form a compound of the formula (6): ##STR15## wherein R 2 , R 3 and X are as defined above, and then subjecting the compound of the formula (6) to a ring closure reaction.
Claim 10
Dependent Claim
116 words
A process for producing a cyclic compound of the formula (2): ##STR14## wherein R 2 is a C 1-10 alkyl group, and R 3 is a hydrogen atom or a C 1-10 alkyl group, Which comprises reacting a compound of the formula (4): HO--CHR.sub.2 --CH.sub.2 COOH (4) wherein R 2 is as defined above, with a compound of the formula (5): X--CHR.sub.3 --CO--Y (5) wherein R 3 is as defined above, and each of X and Y is a halogen atom, to form a compound of the formula (6): ##STR15## wherein R 2 , R 3 and X are as defined above, and then subjecting the compound of the formula (6) to a ring closure reaction.
Claim 11
Dependent Claim
45 words
The process of claim 5, wherein compounds (4) and (5) are dissolved in a solvent and reacted in the presence of an amine compound to obtain compound (6), and compound (6) is then treated with alkali to obtain compound (2) by a ring closure reaction.
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