US5403897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing lactic acid-based copolyester and packaging material
Assignee: DIC Corp
•
Filing: 1994-03-25
•
Granted: 1995-04-04
•
Expires: 2014-03-25
Abstract
Abstract A process for producing a lactic acid-based copolyester by the ring-opening copolymerization and transesterification of a lactide (A) with an aromatic polyester (B) and/or an aliphatic polyester (C) in the presence of a ring-opening polymerization catalyst (D), and a packaging material comprising the lactic acid-based copolyester obtained by the process are disclosed. According to the present invention, a lactic acid-based degradable copolyester which has a sufficiently high molecular weight and satisfactory toughness and also has suitable rigidity, pliability, and transparency according to applications can be produced. Further, a general-purpose packaging material, e.g., a sheet or film, which comprises the lactic acid-based copolyester produced by the process and is excellent in formability, degradability, and transparency can also be produced.
Inventors
- 👤 Hiroshi Ebato
- 👤 Satoshi Oya
- 👤 Yasutoshi Kakizawa
- 👤 Hideyuki Furuta
- 👤 Kosuke Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:12
CPC Classifications
C; C08; C08L; C08L67/00; C08G; C08G63/00; C08G63/02; C08G63/60; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 49
Claim 1
Independent Claim
121 words
A process for producing a lactic acid-based linear copolyester having a weight-average molecular weight of from 20,000 to 400,000, comprising subjecting from 25 to 98 parts by weight of (A) a lactide, from 1 to 70 parts by weight of (B) a linear aromatic polyester containing an aromatic ring, having a weight-average molecular weight of from 10,000 to 250,000, and comprising an aromatic dicarboxylic acid unit and an aliphatic diol unit, and from 1 to 70 parts by weight of (C) a linear aliphatic polyester having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aliphatic dicarboxylic acid unit and an aliphatic diol unit to ring-opening copolymerization and transesterification in the presence of (D) a ring-opening polymerization catalyst.
Claim 2
Dependent Claim
121 words
A process for producing a lactic acid-based linear copolyester having a weight-average molecular weight of from 20,000 to 400,000, comprising subjecting from 25 to 98 parts by weight of (A) a lactide, from 1 to 70 parts by weight of (B) a linear aromatic polyester containing an aromatic ring, having a weight-average molecular weight of from 10,000 to 250,000, and comprising an aromatic dicarboxylic acid unit and an aliphatic diol unit, and from 1 to 70 parts by weight of (C) a linear aliphatic polyester having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aliphatic dicarboxylic acid unit and an aliphatic diol unit to ring-opening copolymerization and transesterification in the presence of (D) a ring-opening polymerization catalyst.
Claim 3
Dependent Claim
91 words
A process for producing a lactic acid-based linear copolyester having a weight-average molecular weight of from 20,000 to 400,000, comprising subjecting from 25 to 98 parts by weight of (A) a lactide and from 2 to 75 parts by weight of (E) a linear aromatic/aliphatic polyester containing an aromatic ring, having a weight-average molecular weight of from 10,000 to 250,000, and comprising an aromatic dicarboxylic acid unit, an aliphatic dicarboxylic acid unit, and an aliphatic diol unit to ring-opening polymerization and transesterification in the presence of (D) a ring-opening polymerization catalyst.
Claim 4
Dependent Claim
91 words
A process for producing a lactic acid-based linear copolyester having a weight-average molecular weight of from 20,000 to 400,000, comprising subjecting from 25 to 98 parts by weight of (A) a lactide and from 2 to 75 parts by weight of (E) a linear aromatic/aliphatic polyester containing an aromatic ring, having a weight-average molecular weight of from 10,000 to 250,000, and comprising an aromatic dicarboxylic acid unit, an aliphatic dicarboxylic acid unit, and an aliphatic diol unit to ring-opening polymerization and transesterification in the presence of (D) a ring-opening polymerization catalyst.
Claim 5
Dependent Claim
82 words
A process for producing a lactic acid-based linear copolyester having a weight-average molecular weight of from 20,000 to 400,000, comprising subjecting from 50 to 98 parts by weight of (A) a lactide and from 2 to 50 parts by weight of (C) a linear aliphatic polyester having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aliphatic dicarboxylic acid unit and an aliphatic diol unit to ring-opening polymerization and transesterification in the presence of (D) a ring-opening polymerization catalyst.
Claim 6
Dependent Claim
82 words
A process for producing a lactic acid-based linear copolyester having a weight-average molecular weight of from 20,000 to 400,000, comprising subjecting from 50 to 98 parts by weight of (A) a lactide and from 2 to 50 parts by weight of (C) a linear aliphatic polyester having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aliphatic dicarboxylic acid unit and an aliphatic diol unit to ring-opening polymerization and transesterification in the presence of (D) a ring-opening polymerization catalyst.
Claim 7
Dependent Claim
82 words
A process for producing a lactic acid-based linear copolyester having a weight-average molecular weight of from 20,000 to 400,000, comprising subjecting from 50 to 98 parts by weight of (A) a lactide and from 2 to 50 parts by weight of (B) a linear aromatic polyester having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aromatic dicarboxylic acid unit and an aliphatic diol unit to ring-opening polymerization and transesterification in the presence of (D) a ring-opening polymerization catalyst.
Claim 8
Dependent Claim
82 words
A process for producing a lactic acid-based linear copolyester having a weight-average molecular weight of from 20,000 to 400,000, comprising subjecting from 50 to 98 parts by weight of (A) a lactide and from 2 to 50 parts by weight of (B) a linear aromatic polyester having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aromatic dicarboxylic acid unit and an aliphatic diol unit to ring-opening polymerization and transesterification in the presence of (D) a ring-opening polymerization catalyst.
Claim 9
Dependent Claim
113 words
A process for producing a lactide-based polyester having a tensile modulus of from 500 to 50,000 kg/cm 2 , comprising reacting from 25 to 98 parts by weight of a lactide (A) with from 1 to 60 parts by weight of a linear aromatic polyester (B) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aromatic dicarboxylic acid unit and an aliphatic diol unit and from 1 to 60 parts by weight of a linear aliphatic polyester (C) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aliphatic dicarboxylic acid unit and an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 10
Dependent Claim
113 words
A process for producing a lactide-based polyester having a tensile modulus of from 500 to 50,000 kg/cm 2 , comprising reacting from 25 to 98 parts by weight of a lactide (A) with from 1 to 60 parts by weight of a linear aromatic polyester (B) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aromatic dicarboxylic acid unit and an aliphatic diol unit and from 1 to 60 parts by weight of a linear aliphatic polyester (C) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aliphatic dicarboxylic acid unit and an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 11
Dependent Claim
81 words
A process for producing a lactide-based polyester having a tensile modulus of from 500 to 50,000 kg/cm 2 , comprising reacting from 25 to 98 parts by weight of a lactide (A) with from 2 to 75 parts by weight of an aromatic/aliphatic polyester (E) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aromatic dicarboxylic acid unit, an aliphatic dicarboxylic acid unit, and an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 12
Dependent Claim
81 words
A process for producing a lactide-based polyester having a tensile modulus of from 500 to 50,000 kg/cm 2 , comprising reacting from 25 to 98 parts by weight of a lactide (A) with from 2 to 75 parts by weight of an aromatic/aliphatic polyester (E) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aromatic dicarboxylic acid unit, an aliphatic dicarboxylic acid unit, and an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 13
Dependent Claim
76 words
A process for producing a lactide-based polyester having a tensile modulus of from 500 to 50,000 kg/cm 2 , comprising reacting from 25 to 98 parts by weight of a lactide (A) with from 2 to 75 parts by weight of an aliphatic polyester (C) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aliphatic dicarboxylic acid unit and an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 14
Dependent Claim
76 words
A process for producing a lactide-based polyester having a tensile modulus of from 500 to 50,000 kg/cm 2 , comprising reacting from 25 to 98 parts by weight of a lactide (A) with from 2 to 75 parts by weight of an aliphatic polyester (C) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aliphatic dicarboxylic acid unit and an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 15
Dependent Claim
76 words
A process for producing a lactide-based polyester having a tensile modulus of from 500 to 50,000 kg/cm 2 , comprising reacting from 25 to 98 parts by weight of a lactide (A) with from 2 to 75 parts by weight of an aromatic polyester (B) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aromatic dicarboxylic acid unit and an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 16
Dependent Claim
76 words
A process for producing a lactide-based polyester having a tensile modulus of from 500 to 50,000 kg/cm 2 , comprising reacting from 25 to 98 parts by weight of a lactide (A) with from 2 to 75 parts by weight of an aromatic polyester (B) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aromatic dicarboxylic acid unit and an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 17
Dependent Claim
102 words
A process for producing a transparent lactide-based polyester, comprising reacting from 25 to 98 parts by weight of a lactide (A) with from 1 to 60 parts by weight of a linear aromatic polyester (B) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aromatic dicarboxylic acid unit and an aliphatic diol unit and from 2 to 75 parts by weight of a linear aliphatic polyester (C) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aliphatic dicarboxylic acid unit and an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 18
Dependent Claim
102 words
A process for producing a transparent lactide-based polyester, comprising reacting from 25 to 98 parts by weight of a lactide (A) with from 1 to 60 parts by weight of a linear aromatic polyester (B) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aromatic dicarboxylic acid unit and an aliphatic diol unit and from 2 to 75 parts by weight of a linear aliphatic polyester (C) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aliphatic dicarboxylic acid unit and an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 19
Dependent Claim
91 words
A process for producing a transparent lactide-based polyester, comprising reacting from 25 to 98 parts by weight of a lactide (A) with from 2 to 75 parts by weight of an aromatic/aliphatic polyester (E) having a weight-average molecular weight of from 10,000 to 250,000 and comprising 1 to 40 parts by weight of an aromatic dicarboxylic acid unit, 1 to 40 parts by weight of an aliphatic dicarboxylic acid unit, and 1 to 40 parts by weight of an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 20
Dependent Claim
91 words
A process for producing a transparent lactide-based polyester, comprising reacting from 25 to 98 parts by weight of a lactide (A) with from 2 to 75 parts by weight of an aromatic/aliphatic polyester (E) having a weight-average molecular weight of from 10,000 to 250,000 and comprising 1 to 40 parts by weight of an aromatic dicarboxylic acid unit, 1 to 40 parts by weight of an aliphatic dicarboxylic acid unit, and 1 to 40 parts by weight of an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 21
Dependent Claim
65 words
A process for producing a transparent lactide-based polyester, comprising reacting from 75 to 98 parts by weight of a lactide (A) with from 2 to 25 parts by weight of an aliphatic polyester (C) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aliphatic dicarboxylic acid unit and an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 22
Dependent Claim
65 words
A process for producing a transparent lactide-based polyester, comprising reacting from 75 to 98 parts by weight of a lactide (A) with from 2 to 25 parts by weight of an aliphatic polyester (C) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aliphatic dicarboxylic acid unit and an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 23
Dependent Claim
65 words
A process for producing a transparent lactide-based polyester, comprising reacting from 75 to 98 parts by weight of a lactide (A) with from 2 to 25 parts by weight of an aromatic polyester (B) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aromatic dicarboxylic acid unit and an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 24
Dependent Claim
65 words
A process for producing a transparent lactide-based polyester, comprising reacting from 75 to 98 parts by weight of a lactide (A) with from 2 to 25 parts by weight of an aromatic polyester (B) having a weight-average molecular weight of from 10,000 to 250,000 and comprising an aromatic dicarboxylic acid unit and an aliphatic diol unit, in the presence of a ring-opening polymerization catalyst (D).
Claim 25
Dependent Claim
48 words
The process as claimed in any one of claims 1 to 12, wherein the linear polyester having a melting point or a softening point the lower of which is not higher than 200° C. is dissolved in the lactide (A) before the ring-opening polymerization and transesterification are conducted.
Claim 26
Dependent Claim
26 words
The process as claimed in any one of claims 1 to 12, wherein the ring-opening polymerization and transesterification are conducted in the presence of a solvent.
Claim 27
Dependent Claim
46 words
The process as claimed in any one of claims 1, 2, 4, 5, 6, 8, 9, 10, and 12, wherein the aromatic dicarboxylic acid unit is one derived from at least one member selected from the group consisting of phthalic acid, isophthalic acid, and terephthalic acid.
Claim 28
Dependent Claim
40 words
The process as claimed in any one of claims 1, 2, 3, 5, 6, 7, 9, 10, and 11, wherein the aliphatic dicarboxylic acid unit is one derived from an aliphatic dicarboxylic acid having from 4 to 14 carbon atoms.
Claim 29
Dependent Claim
30 words
The process as claimed in any one of claims 1 to 12, wherein the aliphatic diol unit is one derived from a diol having from 2 to 10 carbon atoms.
Claim 30
Dependent Claim
70 words
A packaging material comprising as an essential component a lactic acid-based linear copolyester having a weight-average molecular weight of from 20,000 to 400,000 and made up of from 25 to 98% by weight poly(lactic acid) block and from 2 to 75% by weight polyester block consisting of from 10 to 35% by weight aromatic-ring moieties and from 65 to 90% by weight chain-hydrocarbon and/or alicyclic-hydrocarbon moieties containing the group --COO--.
Claim 31
Dependent Claim
70 words
A packaging material comprising as an essential component a lactic acid-based linear copolyester having a weight-average molecular weight of from 20,000 to 400,000 and made up of from 25 to 98% by weight poly(lactic acid) block and from 2 to 75% by weight polyester block consisting of from 10 to 35% by weight aromatic-ring moieties and from 65 to 90% by weight chain-hydrocarbon and/or alicyclic-hydrocarbon moieties containing the group --COO--.
Claim 32
Dependent Claim
55 words
A packaging material comprising as an essential component a lactic acid-based linear copolyester having a weight-average molecular weight of from 20,000 to 400,000 and made up of from 25 to 98% by weight poly(lactic acid) block and from 2 to 75% by weight polyester block consisting of chain-hydrocarbon and/or alicyclic-hydrocarbon moieties containing the group --COO--.
Claim 33
Dependent Claim
55 words
A packaging material comprising as an essential component a lactic acid-based linear copolyester having a weight-average molecular weight of from 20,000 to 400,000 and made up of from 25 to 98% by weight poly(lactic acid) block and from 2 to 75% by weight polyester block consisting of chain-hydrocarbon and/or alicyclic-hydrocarbon moieties containing the group --COO--.
Claim 34
Dependent Claim
89 words
A packaging material comprising a lactic acid-based linear copolyester which is made up of from 25 to 98% by weight poly(lactic acid) block and from 2 to 75% by weight polyester block consisting of from 20 to 35% by weight aromatic-ring moieties and from 65 to 80% by weight chain-hydrocarbon and/or alicyclic-hydrocarbon moieties containing the group --COO--, contains from 0.4 to 28% by weight aromatic rings, and has a weight-average molecular weight of from 100,000 to 400,000 and a tensile modulus of from 15,000 to 50,000 kg/cm 2 .
Claim 35
Dependent Claim
89 words
A packaging material comprising a lactic acid-based linear copolyester which is made up of from 25 to 98% by weight poly(lactic acid) block and from 2 to 75% by weight polyester block consisting of from 20 to 35% by weight aromatic-ring moieties and from 65 to 80% by weight chain-hydrocarbon and/or alicyclic-hydrocarbon moieties containing the group --COO--, contains from 0.4 to 28% by weight aromatic rings, and has a weight-average molecular weight of from 100,000 to 400,000 and a tensile modulus of from 15,000 to 50,000 kg/cm 2 .
Claim 36
Dependent Claim
64 words
A packaging material comprising a lactic acid-based linear copolyester which is made up of from 80 to 98% by weight poly(lactic acid) block and from 2 to 20% by weight polyester block consisting of chain-hydrocarbon and/or alicyclic-hydrocarbon containing the group --COO-- and has a weight-average molecular weight of from 100,000 to 400,000 and a tensile modulus of from 15,000 to 50,000 kg/cm 2 .
Claim 37
Dependent Claim
64 words
A packaging material comprising a lactic acid-based linear copolyester which is made up of from 80 to 98% by weight poly(lactic acid) block and from 2 to 20% by weight polyester block consisting of chain-hydrocarbon and/or alicyclic-hydrocarbon containing the group --COO-- and has a weight-average molecular weight of from 100,000 to 400,000 and a tensile modulus of from 15,000 to 50,000 kg/cm 2 .
Claim 38
Dependent Claim
89 words
A packaging material comprising a lactic acid-based linear copolyester which is made up of from 25 to 98% by weight poly(lactic acid) block and from 2 to 75% by weight polyester block consisting of from 10 to 25% by weight aromatic-ring moieties and from 75 to 90% by weight chain-hydrocarbon and/or alicyclic-hydrocarbon moieties containing the group --COO--, contains from 0.2 to 19% by weight aromatic rings, and has a weight-average molecular weight of from 40,000 to 400,000 and a tensile modulus of from 500 to 20,000 kg/cm 2 .
Claim 39
Dependent Claim
89 words
A packaging material comprising a lactic acid-based linear copolyester which is made up of from 25 to 98% by weight poly(lactic acid) block and from 2 to 75% by weight polyester block consisting of from 10 to 25% by weight aromatic-ring moieties and from 75 to 90% by weight chain-hydrocarbon and/or alicyclic-hydrocarbon moieties containing the group --COO--, contains from 0.2 to 19% by weight aromatic rings, and has a weight-average molecular weight of from 40,000 to 400,000 and a tensile modulus of from 500 to 20,000 kg/cm 2 .
Claim 40
Dependent Claim
64 words
A packaging material comprising a lactic acid-based linear copolyester which is made up of from 25 to 95% by weight poly(lactic acid) block and from 5 to 75% by weight polyester block consisting of chain-hydrocarbon and/or alicyclic-hydrocarbon containing the group --COO-- and has a weight-average molecular weight of from 40,000 to 400,000 and a tensile modulus of from 500 to 20,000 kg/cm 2 .
Claim 41
Dependent Claim
64 words
A packaging material comprising a lactic acid-based linear copolyester which is made up of from 25 to 95% by weight poly(lactic acid) block and from 5 to 75% by weight polyester block consisting of chain-hydrocarbon and/or alicyclic-hydrocarbon containing the group --COO-- and has a weight-average molecular weight of from 40,000 to 400,000 and a tensile modulus of from 500 to 20,000 kg/cm 2 .
Claim 42
Dependent Claim
90 words
A transparent packaging material comprising a lactic acid-based linear copolyester which is made up of from 75 to 98% by weight poly(lactic acid) block and from 2 to 25% by weight polyester block consisting of from 10 to 35% by weight aromatic-ring moieties and from 65 to 90% by weight chain-hydrocarbon and/or alicyclic-hydrocarbon moieties containing the group --COO--, contains from 0.2 to 9% by weight aromatic rings, and has a weight-average molecular weight of from 100,000 to 400,000 and a tensile modulus of from 15,000 to 50,000 kg/cm 2 .
Claim 43
Dependent Claim
90 words
A transparent packaging material comprising a lactic acid-based linear copolyester which is made up of from 75 to 98% by weight poly(lactic acid) block and from 2 to 25% by weight polyester block consisting of from 10 to 35% by weight aromatic-ring moieties and from 65 to 90% by weight chain-hydrocarbon and/or alicyclic-hydrocarbon moieties containing the group --COO--, contains from 0.2 to 9% by weight aromatic rings, and has a weight-average molecular weight of from 100,000 to 400,000 and a tensile modulus of from 15,000 to 50,000 kg/cm 2 .
Claim 44
Dependent Claim
90 words
A transparent packaging material comprising a lactic acid-based linear copolyester which is made up of from 75 to 98% by weight poly(lactic acid) block and from 2 to 25% by weight polyester block consisting of from 10 to 25% by weight aromatic-ring moieties and from 75 to 90% by weight chain-hydrocarbon and/or alicyclic-hydrocarbon moieties containing the group --COO--, contains from 0.2 to 7% by weight aromatic rings, and has a weight-average molecular weight of from 40,000 to 400,000 and a tensile modulus of from 500 to 20,000 kg/cm 2 .
Claim 45
Dependent Claim
90 words
A transparent packaging material comprising a lactic acid-based linear copolyester which is made up of from 75 to 98% by weight poly(lactic acid) block and from 2 to 25% by weight polyester block consisting of from 10 to 25% by weight aromatic-ring moieties and from 75 to 90% by weight chain-hydrocarbon and/or alicyclic-hydrocarbon moieties containing the group --COO--, contains from 0.2 to 7% by weight aromatic rings, and has a weight-average molecular weight of from 40,000 to 400,000 and a tensile modulus of from 500 to 20,000 kg/cm 2 .
Claim 46
Dependent Claim
65 words
A transparent packaging material comprising a lactic acid-based linear copolyester which is made up of from 75 to 98% by weight poly(lactic acid) block and from 2 to 25% by weight polyester block consisting of chain-hydrocarbon and/or alicyclic-hydrocarbon containing the group --COO-- and has a weight-average molecular weight of from 40,000 to 400,000 and a tensile modulus of from 500 to 20,000 kg/cm 2 .
Claim 47
Dependent Claim
65 words
A transparent packaging material comprising a lactic acid-based linear copolyester which is made up of from 75 to 98% by weight poly(lactic acid) block and from 2 to 25% by weight polyester block consisting of chain-hydrocarbon and/or alicyclic-hydrocarbon containing the group --COO-- and has a weight-average molecular weight of from 40,000 to 400,000 and a tensile modulus of from 500 to 20,000 kg/cm 2 .
Claim 48
Dependent Claim
21 words
The packaging material as claimed in any one of claims 18 to 26, which is either a sheet or a film.
Claim 49
Dependent Claim
18 words
The packaging material as claimed in claim 27, which is a monoaxially or biaxially stretched sheet or film.
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) | 1998-04-03 | 1998-10-03 | 1999-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-03 | 2002-10-03 | 2003-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-03 | 2006-10-03 | 2007-04-04 | $7700.00 | Window Closed / Lapsed |