US4565851A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Containers having improved gas barrier properties
Assignee: Eastman Chemical Co
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Filing: 1983-04-25
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Granted: 1986-01-21
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Expires: 2003-04-25
Abstract
Abstract The present invention provides polymer blend compositions which are useful in the formation of containers having improved resistance to gas permeability. The polymer blend compositions comprise about 5 to 50 percent by weight of a first polyester comprising polyglycolic acid and correspondingly about 50 to 95 percent by weight of a second polyester. The second polyester comprises units derived from a diacid component comprising terephthalic acid and units derived from a diol component which preferably comprises ethylene glycol. The containers which are provided by the present invention may be in the form of sheet, film, molded articles, such as bottles, and other such structures.
Inventors
- 👤 Robert B. Barbee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:11
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
61 words
A polymer blend comprising about 5 to 50 percent by weight of a first polyester comprising polyglycolic acid and correspondingly about 50 to 95 percent by weight of a second polyester comprising units derived from a diacid component comprising terephthalic acid and units derived from a diol component which comprises at least one diol containing up to about 8 carbon atoms.
Claim 2
Dependent Claim
61 words
A polymer blend comprising about 5 to 50 percent by weight of a first polyester comprising polyglycolic acid and correspondingly about 50 to 95 percent by weight of a second polyester comprising units derived from a diacid component comprising terephthalic acid and units derived from a diol component which comprises at least one diol containing up to about 8 carbon atoms.
Claim 3
Dependent Claim
21 words
The polymer blend of claim 1 wherein said diol component is selected from ethylene glycol, 1,4-cyclohexylenedimethanol, butylene glycol, and mixtures thereof.
Claim 4
Dependent Claim
13 words
The polymer blend of claim 2 wherein said diol component comprises ethylene glycol.
Claim 5
Dependent Claim
13 words
The polymer blend of claim 1 wherein said second polyester comprises polyethylene terephthalate.
Claim 6
Dependent Claim
35 words
A polymer blend according to claim 1 wherein said polymer blend comprises about 25 to 50 percent by weight of polyglycolic acid and correspondingly about 50 to 75 percent by weight of said second polyester.
Claim 7
Dependent Claim
35 words
A polymer blend according to claim 1 wherein said polymer blend comprises about 5 to 30 percent by weight of polyglycolic acid and correspondingly about 70 to 95 percent by weight of said second polyester.
Claim 8
Dependent Claim
10 words
A container formed from the polymer blend of claim 1.
Claim 9
Dependent Claim
10 words
A film formed from the polymer blend of claim 5.
Claim 10
Dependent Claim
11 words
A molded container formed from the polymer blend of claim 6.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |