US4766182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polylactide compositions
Assignee: EIDP Inc
•
Filing: 1987-10-15
•
Granted: 1988-08-23
•
Expires: 2007-10-15
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
2026-10-22 23:54
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: 7
Claim 1
Independent Claim
31 words
A process for interlocking polymeric segments of poly(R-lactide) and poly (S-lactide) comprising intimately contacting said segments at a temperature below the melting temperature of the highest melting phase until interlocking occurs.
Claim 2
Dependent Claim
31 words
A process for interlocking polymeric segments of poly(R-lactide) and poly (S-lactide) comprising intimately contacting said segments at a temperature below the melting temperature of the highest melting phase until interlocking occurs.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein the segments are interlocked by mixing solid poly(R-lactide) and poly(S-lactide) and heating the combination at a temperature above the melting temperature of the lowest melting phase.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the segments are contacted by dissolving them in a solvent.
Claim 5
Dependent Claim
31 words
The process of claim 3 wherein the poly(R-lactide) segments and poly (S-lactide) segments are dissolved in separate solvents and then the separate solutions are combined before the combined solvent is evaporated.
Claim 6
Dependent Claim
18 words
The process of claim 4 wherein the combined solutions are allowed to gel before the solvent is evaporated.
Claim 7
Dependent Claim
10 words
The process of claim 3 wherein the solvent is chloroform.
References Cited (Backward Citations)
US3641200A
Cited
US3639503A
Cited
US4419340A
Cited
US3636956A
Cited
US3797499A
Cited
US4279249A
Cited
US4471077A
Cited
JPS6136321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |