Patent US4468510A successfully refreshed from Google Patents.
US4468510A
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Polyesters of trans-4,4'-stilbenedicarboxylic acid, terephthalic acid or 2,6-naphthalenedicarboxylic acid, 1,2-propanediol and 1,3-propanediol
Assignee: Eastman Chemical Co
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Filing: 1983-11-14
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Granted: 1984-08-28
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Expires: 2003-11-14
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. This invention is also concerned with copolyesters comprising repeating units of trans-4,4'-stilbenedicarboxylic acid, at least 10 mol % of one or more components selected from the group consisting of an aromatic dicarboxylic acid, aliphatic dicarboxylic acid or aliphatic glycol, and 1,3-propanediol. The polyesters have unobviously low gas permeability properties.
Inventors
- 👤 John C. Morris
- 👤 Winston J. Jackson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:00
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
125 words
A film forming copolyester comprising repeating units prepared from 100 to 50 mol % trans-4,4'-stilbenedicarboxylic acid or esters thereof, repeating units prepared from 0 to 50 mol % of another aromatic dicarboxylic acid or esters thereof containing 8 to 20 carbon atoms or 0 to 40 mol % of an aliphatic dircarboxylic acid or esters thereof containing 3 to 10 carbon atoms, repeating units prepared from 10 to 60 mol % of 1.3-propanediol and repeating units prepared from 0 to 40 mol % of another aliphatic glycol containing 2 to 10 carbon atoms, provided that said copolyester contains at least 10 mol % of repeating units from said aromatic dicarboxylic acid or esters thereof, said aliphatic dicarboxylic acid or esters thereof, or said aliphatic glycol.
Claim 2
Dependent Claim
125 words
A film forming copolyester comprising repeating units prepared from 100 to 50 mol % trans-4,4'-stilbenedicarboxylic acid or esters thereof, repeating units prepared from 0 to 50 mol % of another aromatic dicarboxylic acid or esters thereof containing 8 to 20 carbon atoms or 0 to 40 mol % of an aliphatic dircarboxylic acid or esters thereof containing 3 to 10 carbon atoms, repeating units prepared from 10 to 60 mol % of 1.3-propanediol and repeating units prepared from 0 to 40 mol % of another aliphatic glycol containing 2 to 10 carbon atoms, provided that said copolyester contains at least 10 mol % of repeating units from said aromatic dicarboxylic acid or esters thereof, said aliphatic dicarboxylic acid or esters thereof, or said aliphatic glycol.
Claim 3
Dependent Claim
27 words
A copolyester of claim 1 wherein the repeating units from trans-4,4'-stilbenedicarboxylic acid portion of the copolyester are present in the amount of 100 to 60 mol %.
Claim 4
Dependent Claim
26 words
A copolyester of claim 1 wherein the repeating units from 1,3-propanediol portion of the copolyester are present in the amount of 100 to 70 mol %.
Claim 5
Dependent Claim
28 words
A copolyester of claim 1 wherein the repeating units from said trans-4,4'-stilbenedicarboxylic acid portion of the copolyester are present in the amount of 90 to 50 mol %.
Claim 6
Dependent Claim
49 words
A copolyester of claim 4 wherein the repeating units from said aromatic dicarboxylic acid or esters thereof are present in the amount of at least 10 mol % and said acid or esters thereof are selected from terephthalic acid, isophthalic acid, 2-chloroterephthalic acid or 2,5-dicloroterephthalic acid or their esters.
Claim 7
Dependent Claim
30 words
A copolyester of claim 1 wherein the repeating units from said aliphatic glycol are present in the amount of at least 10 mol % and said glycol is ethylene glycol.
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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) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |