Patent US5594076A successfully refreshed from Google Patents.
US5594076A
Expired / Lapsed
US
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Hydrodegradable polyesters
Assignee: Penn State Research Foundation
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Filing: 1995-06-07
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Granted: 1997-01-14
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Expires: 2015-06-07
Abstract
Abstract Hydrodegradable polyesters based upon the random copolymerization of aromatic and absorbable aliphatic polyesters are disclosed. The hydrodegradable polyesters are useful in preparing a variety of products including disposable containers, disposable diapers, fishing lines and nets, and the like.
Inventors
- 👤 Bernard Gordon, III
- 👤 Prabodh P. Sharma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:54
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/183; Y; Y10; Y10S; Y10S525/00; Y10S525/938
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
192 words
A hydrodegradable polyester copolymer consisting essentially of a substantially non-degradable aromatic polyester subunit and a hydrodegradable oxalate subunit and having the formula ##STR5## wherein R is selected from the group consisting of a straight or branched alkylene of 2 to 16 carbons in length, a polyether of the formula --[(CH 2 ) n --O] x --(CH 2 ) n --, or a mixture thereof, wherein n is a number from 2 to 16 and X is a number from 1 to 1000; R 2 is selected from the group consisting of a straight or branched alkylene of 2 to 16 carbons in length, a polyether of the formula --[(CH 2 ) n --O] x --(CH 2 ) n --, or a mixture thereof, wherein n is a number from 2 to 16 and X is a number from 1 to 1000, said hydrolyzable oxalate subunit being randomly distributed in, and comprising 5-30 weight percent of said copolymer, the balance of said copolymer being said aromatic polyester subunit, and said copolymer exhibiting a significant decrease in intrinsic viscosity when hydrolyzed in water at a temperature of about 50° C. for about 3-4 days.
Claim 2
Dependent Claim
192 words
A hydrodegradable polyester copolymer consisting essentially of a substantially non-degradable aromatic polyester subunit and a hydrodegradable oxalate subunit and having the formula ##STR5## wherein R is selected from the group consisting of a straight or branched alkylene of 2 to 16 carbons in length, a polyether of the formula --[(CH 2 ) n --O] x --(CH 2 ) n --, or a mixture thereof, wherein n is a number from 2 to 16 and X is a number from 1 to 1000; R 2 is selected from the group consisting of a straight or branched alkylene of 2 to 16 carbons in length, a polyether of the formula --[(CH 2 ) n --O] x --(CH 2 ) n --, or a mixture thereof, wherein n is a number from 2 to 16 and X is a number from 1 to 1000, said hydrolyzable oxalate subunit being randomly distributed in, and comprising 5-30 weight percent of said copolymer, the balance of said copolymer being said aromatic polyester subunit, and said copolymer exhibiting a significant decrease in intrinsic viscosity when hydrolyzed in water at a temperature of about 50° C. for about 3-4 days.
Claim 3
Dependent Claim
16 words
As an article of manufacture, the copolyester of claim 1 in the form of fishing line.
References Cited (Backward Citations)
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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) | 2000-01-14 | 2000-07-15 | 2001-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-14 | 2004-07-15 | 2005-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-14 | 2008-07-15 | 2009-01-14 | $7700.00 | Window Closed / Lapsed |