US4950735A
Expired / Lapsed
US
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Biodegradable polyamides
Assignee: SHARPOINT LP A DE LP
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Filing: 1988-07-26
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Granted: 1990-08-21
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Expires: 2008-07-26
Abstract
Abstract Biodegradable polyamides, useful as absorable sutures and as controlled release binder materials, are prepared by condensing 4,4'-spirobibutyrolactone with a primary diamine, optionally in the presence of a nylon salt, leading to homopolymers containing lactam structural units, or to random copolymers.
Inventors
- 👤 David P. Vanderbilt
- 👤 Donald R. Cowsar
- 👤 Richard L. Dunn
- 👤 James P. English
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:06
CPC Classifications
A; A61; A61L; A61L17/00; A61L17/06; A61L17/10; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2031; A61K9/2045; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/60; C08G18/603; C08G69/00; C08G69/02; C08G69/26; C08G69/265
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
134 words
An organic polymer, the structural formula of which includes a backbone containing n biradical units of the formula ##STR5## joined randomly with m biradical units of the formula ##STR6## wherein n is a positive integer; m is either zero or a positive integer; each R independently is a hydrocarbon radical; X 1 is --OH and Y 1 is --H, or X 1 and Y 1 together constitute a chemical bond in a lactam ring; X 2 is --OH and Y 2 is --H, or X 2 and Y 2 together constitute a chemical bond in a lactam ring; said backbone being capped with a radical selected from ##STR7## --NH 2 , and also ##STR8## when m is a positive integer; with the proviso that the polymer backbone contains lactam units when m is zero.
Claim 2
Dependent Claim
134 words
An organic polymer, the structural formula of which includes a backbone containing n biradical units of the formula ##STR5## joined randomly with m biradical units of the formula ##STR6## wherein n is a positive integer; m is either zero or a positive integer; each R independently is a hydrocarbon radical; X 1 is --OH and Y 1 is --H, or X 1 and Y 1 together constitute a chemical bond in a lactam ring; X 2 is --OH and Y 2 is --H, or X 2 and Y 2 together constitute a chemical bond in a lactam ring; said backbone being capped with a radical selected from ##STR7## --NH 2 , and also ##STR8## when m is a positive integer; with the proviso that the polymer backbone contains lactam units when m is zero.
Claim 3
Dependent Claim
16 words
A polymer according to claim 1 wherein m is zero and the polymer is a homopolymer.
Claim 4
Dependent Claim
18 words
A polymer of claim 2 wherein R is selected from aliphatic and alicyclic groups containing 4-14 carbon atoms.
Claim 5
Dependent Claim
16 words
A polymer of claim 3 wherein R is an aliphatic group selected from pentamethylene and hexamethylene.
Claim 6
Dependent Claim
16 words
A polymer of claim 3 wherein R is an alicyclic group selected from 1,4-cyclohexanebis(methyl) and 4,4'-methylenebis(cyclohexyl).
Claim 7
Dependent Claim
9 words
A polymer of claim 4 wherein R is hexamethylene.
Claim 8
Dependent Claim
18 words
A polymer according to claim 1 wherein m is a positive integer and the polymer is a copolymer.
Claim 9
Dependent Claim
19 words
A polymer of claim 7 wherein each R is selected from aliphatic and alicyclic groups containing 4-14 carbon atoms.
Claim 10
Dependent Claim
25 words
A polymer of claim 8 wherein said aliphatic groups are selected from pentamethylene and hexamethylene and said alicyclic groups are selected from 1,4-cyclohexanebis(methyl) and 4,4'-methylenebis(cyclohexyl).
Claim 11
Dependent Claim
18 words
A polymer according to claim 1 which is cross-linked via a difunctional reagent which reacts with hydroxyl groups.
Claim 12
Dependent Claim
12 words
A polymer according to claim 10 wherein said reagent is a diisocyanate.
References Cited (Backward Citations)
DE30822C
Cited
US4064086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |