US4719246A
Expired / Lapsed
US
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Polylactide compositions
Assignee: Ecological Chemical Products
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Filing: 1986-12-22
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Granted: 1988-01-12
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Expires: 2006-12-22
Abstract
Abstract Novel polylactide composition containing segments of poly(R-lactide) interlocked with segments of poly(S-lactide).
Inventors
- 👤 Joseph R. Murdoch
- 👤 Gary L. Loomis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:27
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; A; A61; A61L; A61L17/00; A61L17/06; A61L17/10; A61L17/12; A61L27/00; A61L27/14; A61L27/18; A61L31/00; A61L31/04; A61L31/06; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/08; C08J9/00; C08J9/28; D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D01F6/625; C08J2367/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
13 words
A porous polymeric composition comprising segments of poly(R-lactide) interlocked with segments of poly(S-lactide).
Claim 2
Dependent Claim
13 words
A porous polymeric composition comprising segments of poly(R-lactide) interlocked with segments of poly(S-lactide).
Claim 3
Dependent Claim
24 words
The composition of claim 1 wherein the molar ratio of R-lactide units to S-lactide units is in the range of about 1:99 to 99:1.
Claim 4
Dependent Claim
24 words
The composition of claim 2 wherein the molar ratio of R-lactide units to S-lactide units is in the range of about 1:9 to 9:1.
Claim 5
Dependent Claim
12 words
The composition of claim 3 wherein the molar ratio is about 1:1.
Claim 6
Dependent Claim
28 words
The composition of claim 2 consisting essentially of segments of poly(R-lactide) and segments of poly(S-lactide), each segment having a number average molecular weight of at least about 300.
Claim 7
Dependent Claim
28 words
The composition of claim 4 consisting essentially of segments of poly(R-lactide) and segments of poly(S-lactide), each segment having a number average molecular weight of at least about 10,000.
Claim 8
Dependent Claim
17 words
The composition of claim 1 wherein at least one of the segments is part of a copolymer.
Claim 9
Dependent Claim
21 words
The composition of claim 7 wherein at least one of the poly(lactide) segments is copolymerized with at least one nonlactide comonomer.
Claim 10
Dependent Claim
12 words
The composition of claim 7 wherein the copolymer is a block copolymer.
Claim 11
Dependent Claim
13 words
The composition of claim 9 wherein the block copolymer is a thermoplastic elastomer.
Claim 12
Dependent Claim
10 words
The composition of claim 7 wherein the comonomer is epsilon-caprolactone.
Claim 13
Dependent Claim
20 words
A polymeric composition comprising segments of poly(R-lactide) and segments of poly(S-lactide), said composition melting higher than either of the segments.
Claim 14
Dependent Claim
20 words
A polymeric composition comprising segments of poly(R-lactide) and segments of poly(S-lactide), said composition melting higher than either of the segments.
Claim 15
Dependent Claim
17 words
The composition of claim 1 wherein essentially all of the interlocked segments are in the high-melting phase.
Claim 16
Dependent Claim
17 words
The composition of claim 6 wherein essentially all of the interlocked segments are in the high-melting phase.
Claim 17
Dependent Claim
11 words
The composition of claim 1 in the form of a gel.
Claim 18
Dependent Claim
18 words
The process of forming a porous structure from the gel of claim 1 comprising solvent exchange and evaporation.
References Cited (Backward Citations)
US4471077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-11 | 1991-07-13 | 1992-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-11 | 1995-07-13 | 1996-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-11 | 1999-07-13 | 2000-01-12 | $7700.00 | Window Closed / Lapsed |