US4420607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters of trans-4,4-stilbenedicarboxylic acid, terephthalic acid or 2,6-naphthalenedicarboxylic acid, and 1,2-propanediol
Assignee: Eastman Chemical Co
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Filing: 1983-03-15
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Granted: 1983-12-13
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Expires: 2003-03-15
Abstract
Abstract This invention relates to polyesters of high molecular weight useful as films, fibers and molding plastics. It is particularly concerned with copolyesters comprising repeating units from trans-4,4'-stilbenedicarboxylic acid, optionally 0-40 mol % of terephthalic acid or 2,6-naphthalenedicarboxylic acid, and 1,2-propanediol, the polyesters having an inherent viscosity of about 0.3 or more and a flexural modulus of at least 900,000 psi.
Inventors
- 👤 John C. Morris
- 👤 Winston J. Jackson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:47
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A polyester comprising repeating units prepared from 100 to 60 mol % trans-4,4'-stilbenedicarboxylic acid or esters thereof, repeating units prepared from 0 to 40 mol % terephthalic acid or 2,6-naphthalenedicarboxylic acid or esters thereof, and repeating units prepared from 1,2 propanediol, said polyester having an inherent viscosity of about 013 or more determined at 25° C. in 60/40 (wt./wt.) phenol/tetrachloroethane (PTCE) at a concentration of 0.5 g./100 mL and said polyester when injection molded into 1/8 inch flexure bars exhibits a flexural modulus of about 900,000 psi or more.
Claim 2
Dependent Claim
89 words
A polyester comprising repeating units prepared from 100 to 60 mol % trans-4,4'-stilbenedicarboxylic acid or esters thereof, repeating units prepared from 0 to 40 mol % terephthalic acid or 2,6-naphthalenedicarboxylic acid or esters thereof, and repeating units prepared from 1,2 propanediol, said polyester having an inherent viscosity of about 013 or more determined at 25° C. in 60/40 (wt./wt.) phenol/tetrachloroethane (PTCE) at a concentration of 0.5 g./100 mL and said polyester when injection molded into 1/8 inch flexure bars exhibits a flexural modulus of about 900,000 psi or more.
Claim 3
Dependent Claim
32 words
Polyester of claim 1 wherein the repeating units from the terephthalic acid or 2,6-naphthalenedicarboxylic acid portion of the polyester are present in the amount of about 5 to about 40 mol %.
Claim 4
Dependent Claim
33 words
Polyester of claim 2 wherein the terephthalic acid repeating units of the polyester are prepared from substituted terephthalic acid selected from 2-chloro, 2,5-dichloro, 2-methyl, 2-ethyl, 2-propyl or 2,5-dimethyl terephthalic acid or esters thereof.
Claim 5
Dependent Claim
29 words
Polyester of claim 2 wherein up to about 10 mol % of the repeating units of terephthalic acid or 2,6-naphthalenedicarboxylic acid are replaced with repeating units from isophthalic acid.
Claim 6
Dependent Claim
31 words
Polyester of claim 1 wherein repeating units from said 1,2-propanediol are replaced with up to about 10 mol % of repeating units from another glycol having 2 to 8 carbon atoms.
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) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |