US4388456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyesters having improved gas barrier properties
Assignee: Eastman Chemical Co
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Filing: 1982-03-01
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Granted: 1983-06-14
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Expires: 2002-03-01
Abstract
Abstract Disclosed are copolyesters characterized by relatively high glass transition temperatures and low oxygen permeability, the copolyesters being derived from A. 100 mol % of an acid component comprising about 5-75 mol % isophthalic acid and about 95-25 mol % 4-carboxy-N-(carboxymethyl)phthalimide, and B. 100 mol % of a glycol component, at least 80 mol % of said glycol component being ethylene glycol.
Inventors
- 👤 Robert B. Barbee
- 👤 Larry A. Minnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:57
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
59 words
Copolyesters characterized by relatively high glass transition temperatures and low oxygen permeability, said copolyesters being derived from A. 100 mol % of an acid component comprising about 5-75 mol % isophthalic acid and about 95-25 mol % 4-carboxy-N-(carboxymethyl)phthalimide, and B. 100 mol % of a glycol component, at least 80 mol % of said glycol component being ethylene glycol.
Claim 2
Dependent Claim
59 words
Copolyesters characterized by relatively high glass transition temperatures and low oxygen permeability, said copolyesters being derived from A. 100 mol % of an acid component comprising about 5-75 mol % isophthalic acid and about 95-25 mol % 4-carboxy-N-(carboxymethyl)phthalimide, and B. 100 mol % of a glycol component, at least 80 mol % of said glycol component being ethylene glycol.
Claim 3
Dependent Claim
15 words
Copolyesters according to claim 1 having a glass transition temperature of at least 70° C.
Claim 4
Dependent Claim
15 words
Copolyesters according to claim 1 having a glass transition temperature of at least 80° C.
Claim 5
Dependent Claim
22 words
Copolyesters according to claim 1 wherein said acid component comprises about 20-70 mol % isophthalic acid and about 80-30 mol % 4-carboxy-N-(carboxymethyl)phthalimide.
Claim 6
Dependent Claim
9 words
Sheet material comprising the copolyester according to claim 1.
Claim 7
Dependent Claim
9 words
Sheet material comprising the copolyester according to claim 3.
Claim 8
Dependent Claim
9 words
Sheet material comprising the copolyester according to claim 4.
Claim 9
Dependent Claim
9 words
A container comprising the copolyester according to claim 1.
Claim 10
Dependent Claim
9 words
A container comprising the copolyester according to claim 3.
Claim 11
Dependent Claim
9 words
A container comprising the copolyester according to claim 4.
References Cited (Backward Citations)
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |