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Patent US4289873A successfully refreshed from Google Patents.
US4289873A
Expired / Lapsed
US
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Process for producing lactone polyesters
Assignee: Daicel Corp
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Filing: 1979-11-28
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Granted: 1981-09-15
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Expires: 1999-11-28
Abstract
Abstract In a process for producing a lactone polyester which comprises ring-opening polymerization of a lactone in the presence of a metal containing organic compound as a catalyst, the improvement wherein said compound is an alcoholate, chelate or organic acid salt of vanadium or molybdenum.
Inventors
- 👤 Masayoshi Kubo
- 👤 Michio Nakanishi
- 👤 Mamoru Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:06
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/823
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
45 words
In a process for producing a lactone polyester which comprises ring-opening polymerization of a lactone in the presence of a metal containing organic compound as a catalyst, the improvement wherein said catalyst is an alcoholate, chelate or organic carboxylic acid salt of vanadium or molybdenum.
Claim 2
Dependent Claim
45 words
In a process for producing a lactone polyester which comprises ring-opening polymerization of a lactone in the presence of a metal containing organic compound as a catalyst, the improvement wherein said catalyst is an alcoholate, chelate or organic carboxylic acid salt of vanadium or molybdenum.
Claim 3
Dependent Claim
15 words
The process of claim 1, wherein said catalyst is an alcoholate of vanadium or molybdenum.
Claim 4
Dependent Claim
15 words
The process of claim 1, wherein said catalyst is a chelate of vanadium or molybdenum.
Claim 5
Dependent Claim
18 words
The process of claim 1, wherein said catalyst is an organic carboxylic acid salt of vanadium or molybdenum.
Claim 6
Dependent Claim
33 words
The process of claims 1 or 2, wherein said alcoholate is of the formula Mo(OR).sub.4, V(OR).sub.3, VO(OR).sub.3 wherein R represents a residue resulting upon the removal of the hydroxyl group from an alcohol.
Claim 7
Dependent Claim
26 words
The process of claims 1 or 3, wherein said chelate is a chelate with acetylacetone, benzoylacetone, trifluoroacetylacetone, ethyl acetoacetate, salicylaldehyde, acetylacetoneimine or salicylaldehydeimine as a ligand.
Claim 8
Dependent Claim
27 words
The process of claims 1 or 4, wherein said organic acid salt is an organic acid salt of naphthenic acid, citric acid, oxalic acid or benzoic acid.
Claim 9
Dependent Claim
25 words
The process of claim 1, wherein said polymerization is carried out in the presence of a polymerization initiator having at least one active hydrogen atom.
Claim 10
Dependent Claim
13 words
The process of claim 1, wherein said catalyst is an organic molybdenum compound.
Claim 11
Dependent Claim
29 words
The process of claim 9, wherein said polymerization is carried out in the absence of a polymerization initiator and said lactone has a moisture content of 0.15% or less.
Claim 12
Dependent Claim
41 words
In a process for producing a lactone polyester which comprises ring-opening polymerization of a lactone in the presence of a metal containing organic compound as a catalyst and a polymerization initiator, the improvement which comprises said catalyst being a zinc acetylacetonate.
Claim 13
Dependent Claim
41 words
In a process for producing a lactone polyester which comprises ring-opening polymerization of a lactone in the presence of a metal containing organic compound as a catalyst and a polymerization initiator, the improvement which comprises said catalyst being a zinc acetylacetonate.
Claim 14
Dependent Claim
20 words
The process of claim 11, wherein said catalyst is zinc bisacetylacetonate Zn(C 5 H 7 O 2 ) 2 .
Claim 15
Dependent Claim
14 words
The process of claim 1, wherein said lactone has at least 5 carbon atoms.
Claim 16
Dependent Claim
10 words
The process of claim 13, wherein said lactone is ε-caprolactone.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |