US4439598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified poly(tetramethylene terephthalate)
Assignee: Eastman Chemical Co
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Filing: 1983-06-13
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Granted: 1984-03-27
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Expires: 2003-06-13
Abstract
Abstract Poly(tetramethylene terephthalate) modified with an aliphatic dicarboxylic acid having 4-12 carbon atoms and either dimer acid or dimer glycol. This copolyester is blow moldable and is found to have improved resistance to gamma radiation.
Inventors
- 👤 Bobby J. Sublett
- 👤 Samuel D. Hilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:49
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/199
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
Copolyester compositions derived from 100 mole % of a dicarboxylic component and 100 mole % of a glycol component, said acid component comprising terephthalic acid modified with about 10-30 mole % of at least one aliphatic dicarboxylic acid having 4 to 12 carbon atoms and said glycol component comprising 1,4-butanediol, said copolyester being further modified with about 10-30 mole % of dimer acid or dimer glycol, and said copolyester composition having a melting point of less than 200° C.
Claim 2
Dependent Claim
79 words
Copolyester compositions derived from 100 mole % of a dicarboxylic component and 100 mole % of a glycol component, said acid component comprising terephthalic acid modified with about 10-30 mole % of at least one aliphatic dicarboxylic acid having 4 to 12 carbon atoms and said glycol component comprising 1,4-butanediol, said copolyester being further modified with about 10-30 mole % of dimer acid or dimer glycol, and said copolyester composition having a melting point of less than 200° C.
Claim 3
Dependent Claim
14 words
Copolyester compositions according to claim 1 modified with about 10-30 mole % dimer acid.
Claim 4
Dependent Claim
14 words
Copolyester compositions according to claim 1 modified with about 10-30 mole % dimer glycol.
Claim 5
Dependent Claim
14 words
Copolyester compositions according to claim 1 wherein said aliphatic dicarboxylic acid is glutaric acid.
Claim 6
Dependent Claim
11 words
A blow molded container comprising the copolyester composition of claim 1.
Claim 7
Dependent Claim
12 words
A flexible container of sheet material comprising the copolyester of claim 1.
References Cited (Backward Citations)
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Cited
US3383343A
Cited
US4166895A
Cited
USRE31270E
Cited
US4254001A
Cited
US4383106A
Cited
US4390687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |