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US5225521A
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Star-shaped hydroxyacid polymers
Assignee: Ecological Chemical Products
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Filing: 1991-12-31
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Granted: 1993-07-06
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Expires: 2011-12-31
Abstract
Abstract Star-shaped poly (hydroxyacid) chains and the process for preparing them are disclosed. The star shaped polymers have the residue of a central polyfunctional compound having at least 5 hydroxyl or amino groups and 5 to 100 carbon atoms with polymeric arms attached to the functional groups. The polymeric arms are formed from lactide, glycolide or caprolactone. In a preferred aspect the inner segment of the arms are an amorphous copolymer of D-lactide and L-lactide and the outer segment of the arms are a semicrystalline polymer of one of L-lactide or D-lactide.
Inventors
- 👤 Maria Spinu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:48
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/08
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
88 words
A star-shaped polymer comprising: (a) a central residue derived from a polyfunctional compound having from 5 to 100 carbon atoms and originally having at least 5 amino or hydroxyl groups; and (b) a plurality of polymeric arms with a number average molecular weight of 1,000 to 100,000 attached to the amino or hydroxyl group locations wherein said polymeric arms are formed of one or more amorphous blocks of polylactide, polyglycolide, polycaprolactone or mixtures thereof, and one or more semicrystalline blocks of polymer of 98-100% L-lactide or 98-100% D-lactide.
Claim 2
Dependent Claim
88 words
A star-shaped polymer comprising: (a) a central residue derived from a polyfunctional compound having from 5 to 100 carbon atoms and originally having at least 5 amino or hydroxyl groups; and (b) a plurality of polymeric arms with a number average molecular weight of 1,000 to 100,000 attached to the amino or hydroxyl group locations wherein said polymeric arms are formed of one or more amorphous blocks of polylactide, polyglycolide, polycaprolactone or mixtures thereof, and one or more semicrystalline blocks of polymer of 98-100% L-lactide or 98-100% D-lactide.
Claim 3
Dependent Claim
10 words
The polymer of claim 1 wherein the arms comprise polylactide.
Claim 4
Dependent Claim
16 words
The polymer of claim 2 wherein the arms consist essentially of poly L-lactide and poly D-lactide.
Claim 5
Dependent Claim
21 words
The polymer of claim 1 wherein the central residue of a polyfunctional compound is a residue of a sugar or inositol.
Claim 6
Dependent Claim
18 words
The polymer of claim 4 wherein the central residue of a polyfunctional compound is the residue of inositol.
Claim 7
Dependent Claim
22 words
The polymer of claim 1 wherein the branches are formed of amorphous segments adjacent the central polyfunctional compound residue and semicrystalline segments.
Claim 8
Dependent Claim
36 words
The polymer of claim 6 wherein the amorphous segments are copolymers of 90 to 10 percent D-lactide and 10 to 90 percent L-lactide, and the semicrystalline segment are a polymer of 98-100% L-lactide or 98-100% D-lactide.
Claim 9
Dependent Claim
29 words
The polymer of claim 7 wherein the amorphous segments have number average molecular weights of 1,000 to 50,000 and the semicrystalline segments have molecular weights of 1,000 to 50,000.
Claim 10
Dependent Claim
21 words
The polymer of claim 8 wherein the central residue of a polyfunctional compound is a residue of a sugar or inositol.
Claim 11
Dependent Claim
18 words
The polymer of claim 9 wherein the central residue of a polyfunctional compound is the residue of inositol.
Claim 12
Dependent Claim
54 words
A process comprising polymerizing lactide, glycolide or caprolactone onto a polyfunctional compound having at least 5 amino or hydroxyl groups of substantially the same reactivity and having 5 to 100 carbon atoms and then polymerizing 98-100% L-lactide or 98-100% D-lactide onto the resulting polymer chains of lactide, glycolide or caprolactone to form semicrystalline segments.
Claim 13
Dependent Claim
54 words
A process comprising polymerizing lactide, glycolide or caprolactone onto a polyfunctional compound having at least 5 amino or hydroxyl groups of substantially the same reactivity and having 5 to 100 carbon atoms and then polymerizing 98-100% L-lactide or 98-100% D-lactide onto the resulting polymer chains of lactide, glycolide or caprolactone to form semicrystalline segments.
Claim 14
Dependent Claim
13 words
The process of claim 11 wherein lactide is polymerized onto the polyfunctional compound.
Claim 15
Dependent Claim
31 words
The process of claim 12 wherein a mixture of 10 to 90 percent L-lactide and 90 to 10 percent D-lactide is first polymerized onto the polyfunctional compound to form amorphous segments.
Claim 16
Dependent Claim
41 words
The process of claim 13 wherein the mixture of L-lactide and D-lactide is polymerized to produce amorphous segments having number average molecular weights of from 1,000 to 50,000 and semicrystalline segments having number average molecular weights of from 1,000 to 50,000.
Claim 17
Dependent Claim
14 words
The process of claim 14 wherein the polyfunctional compound is a sugar or inositol.
Claim 18
Dependent Claim
11 words
The process of claim 15 wherein the polyfunctional compound in inositol.
References Cited (Backward Citations)
US4118470A
Cited
US4122129A
Cited
US4429080A
Cited
US4578384A
Cited
US5028667A
Cited
US5028667B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-05 | 1997-01-04 | 1997-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-05 | 2001-01-04 | 2001-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-05 | 2005-01-04 | 2005-07-06 | $7700.00 | Window Closed / Lapsed |