US5516565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxyalkanoate polymer composition
Assignee: Terumo Corp
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Filing: 1994-06-08
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Granted: 1996-05-14
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Expires: 2014-06-08
Abstract
Abstract There is provided a highly biodegradable resin composition comprising a hydroxyalkanoate polymer and a crystallization nucleating agent. The resin composition may typically comprise a hydroxybutyrate homopolymer or a hydroxybutyrate-hydroxyvalerate copolymer and an aromatic amino acid. There is also provided a device prepared by using such a resin composition. The resin composition of the invention is capable of undergoing a crystallization at a high speed to provide the article molded therefrom with improved properties. The resin composition is also highly degradable in an animal body or in the environment.
Inventors
- 👤 Atsushi Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:42
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0033; A; A61; A61L; A61L17/00; A61L17/06; A61L17/10; A61L17/105; A61L27/00; A61L27/14; A61L27/18; A61L29/00; A61L29/04; A61L29/06; A61L31/00; A61L31/04; A61L31/06; C08G; C08G63/00; C08G63/02; C08G63/06; C08K3/00; C08K3/38; C08K5/16; C08K5/17; C08K5/175; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139; Y10T428/1397
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
31 words
A resin composition comprising 100 parts by weight of a hydroxyalkanoate polymer, and 0.1 to 10 parts by weight of an aromatic amino acid which acts as a crystallization nucleating agent.
Claim 2
Dependent Claim
31 words
A resin composition comprising 100 parts by weight of a hydroxyalkanoate polymer, and 0.1 to 10 parts by weight of an aromatic amino acid which acts as a crystallization nucleating agent.
Claim 3
Dependent Claim
53 words
The resin composition according to claim 1 wherein the hydroxyalkanoate polymer is a polymer having weight average molecular weight of 1,000-1,000,000 represented by the recurring unit of the formula (I): wherein R is hydrogen or an alkyl group having 1 to 4 carbon atoms; n is an integer of from 1 to 8.
Claim 4
Dependent Claim
50 words
The resin composition according to claim 2 wherein said hydroxyalkanoate polymer is a homopolymer or copolymer of at least one repeated structural unit selected from the group consisting of hydroxybutyrate unit wherein R is methyl and n is 1; and hydroxyvalerate unit wherein R is ethyl and n is 1.
Claim 5
Dependent Claim
22 words
The resin composition according to claim 3 wherein the amount of the hydroxyvalerate of said copolymer is from 0 to 30% (w/w).
Claim 6
Dependent Claim
26 words
The resin composition according to claim 1 wherein said crystallization nucleating agent is at least one member selected from the group consisting of tyrosine and phenylalanine.
Claim 7
Dependent Claim
12 words
A medical device fabricated by using the resin composition of claim 1.
Claim 8
Dependent Claim
57 words
The medical device according to claim 6 wherein said device is at least one member selected from the group consisting of infusion system, blood transfusion system, blood circuit, catheter, blood bag, infusion bag, dialysis bag, perintestinal nutrient bag, suture, mesh, patch, pledget, prosthesis, staple, clip, coalescence preventing film, and implant material and screw used for its fixing.
Claim 9
Dependent Claim
12 words
A medical device constituted of a resin composition according to claim 5.
Claim 10
Dependent Claim
52 words
The medical device according to claim 8 wherein said device is selected from the group consisting of an infusion system, blood transfusion system, blood circuit, catheter blood bag, infusion bag, dialysis bag, perintestinal nutrient bag, suture, mesh, patch, pledger, prosthesis, clip, coalescence preventing film, implant material and screw used for its fixing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-14 | 1999-11-13 | 2000-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-14 | 2003-11-13 | 2004-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-14 | 2007-11-13 | 2008-05-14 | $7700.00 | Window Closed / Lapsed |