US4338247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester compositions having improved resistance to radiation deterioration
Assignee: Eastman Chemical Co
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Filing: 1980-06-02
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Granted: 1982-07-06
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Expires: 2000-06-02
Abstract
Abstract Disclosed are highly stable copolyesters having inherent viscosities of at least 0.4 and containing in copolymerized form from about 0.3 to about 5.0% by weight of one or more of the stabilizing moieties having the general formula ##STR1## where R and R 1 are each a chemical bond or an alkylene group of 1-6 carbons; R 2 is alkyl, cycloalkyl, or aryl; R 3 represents 1-5 groups each independently selected from H, Cl, F, alkyl, cycloalkyl, alkoxy, aryl or aryloxy; wherein all of the above alkyl and alkylene moieties comprising or being part of the R 2 or R 3 groups contain from 1-8 carbons; and wherein all of the above alkyl, alkylene, aryl and cycloalkyl moieties may be substituted with up to three substituents selected from halogen, alkyl of 1-8 carbons, alkoxy of 1-8 carbons, aryl, cycloalkyl and CN.
Inventors
- 👤 Joseph S. Zannucci
- 👤 Bobby J. Sublett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:25
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
138 words
A copolyester having an inherent viscosity of at least 0.4 and containing in copolymerized form from about 0.3 to about 5.0% by weight of one or more of the stabilizing moieties having the general formula ##STR15## where R and R 1 are each a chemical bond or an alkylene group of 1-6 carbons; R 2 is alkyl, cycloalkyl, or aryl; R 3 represents 1-5 groups each independently selected from H, Cl, F, alkyl, cycloalkyl, alkoxy, aryl or aryloxy; wherein all of the above alkyl and alkylene moieties comprising or being part of the R 2 or R 3 groups contain from 1-8 carbons, and wherein all of the above alkyl, alkylene, aryl and cycloalkyl moieties may be substituted with up to three substituents selected from halogen, alkyl of 1-8 carbons, alkoxy of 1-8 carbons, aryl, cycloalkyl and CN.
Claim 2
Dependent Claim
138 words
A copolyester having an inherent viscosity of at least 0.4 and containing in copolymerized form from about 0.3 to about 5.0% by weight of one or more of the stabilizing moieties having the general formula ##STR15## where R and R 1 are each a chemical bond or an alkylene group of 1-6 carbons; R 2 is alkyl, cycloalkyl, or aryl; R 3 represents 1-5 groups each independently selected from H, Cl, F, alkyl, cycloalkyl, alkoxy, aryl or aryloxy; wherein all of the above alkyl and alkylene moieties comprising or being part of the R 2 or R 3 groups contain from 1-8 carbons, and wherein all of the above alkyl, alkylene, aryl and cycloalkyl moieties may be substituted with up to three substituents selected from halogen, alkyl of 1-8 carbons, alkoxy of 1-8 carbons, aryl, cycloalkyl and CN.
Claim 3
Dependent Claim
14 words
The copolyester according to claim 1 wherein the stabilizing moiety has the structure ##STR16##
Claim 4
Dependent Claim
107 words
The copolyester according to claim 2 wherein the dibasic acid is selected from one or both of terephthalic and 1,2-, 1,3- or 1,4-cyclohexanedicarboxylic, and may include up to about 40 mole % of a modifying acid selected from adipic, sebacic, p,p'-sulfonyldibenzoic, p-hydroxybenzoic, 1,4-, 1,5-, 2,7- or 2,6-naphthalenedicarboxylic, 4,4'-diphenic or 4,4'-benzophenonedicarboxylic and the glycols are selected from one or more of ethylene glycol, 1,2- or 1,3-propanediol, 1,2- or 1,3- or 1,4-cyclohexanedimethanol, neopentyl glycol, 1,5- or 2,4-pentanediol, 1,6- or 2,5-hexanediol, 1,3-, 2,3- or 1,4-butanediol and 2,2,4,4-tetramethylcyclobutane-1,3-diol and may contain up to about 40 mole % of one or more of diethylene glycol, poly(ethylene glycol), poly(propylene glycol), and poly(butylene glycol).
Claim 5
Dependent Claim
23 words
The copolyester of claim 3 wherein the principal polyester comprises in a molar ratio of from about 4/1 to about 1/4, ethylene/1,4-cyclohexylenedimethylene terephthalate.
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) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |