US4076693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Terephthalic acid/p,p-sulfonyldibenzoic acid/ethylene glycol/neopentyl glycol polyester compositions and containers made therefrom
Assignee: Graham Packaging Plastic Products Inc
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Filing: 1975-12-22
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Granted: 1978-02-28
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Expires: 1995-12-22
Abstract
Abstract Copolyesters having an oxygen permeability of less than 15 cc. mil/100 in. 2 ·day·atm. (at 50% relative humidity and about 73° F.) and a glass transition temperature in excess of 72° C. and having the following four (4) repeating units are contemplated: ##STR1## Based on reactant charges the ratio of (b) units: (a) units will be about 90:10 to about 40:60. Containers made of these polyesters for packaging products of commerce like comestibles are also contemplated.
Inventors
- 👤 Santos W. Go
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:54
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
150 words
A linear copolyester which can be melted and molded to a clear container, the repeating units of said polyester consisting essentially of ##STR4## said polyester having an oxygen permeability of less than 15 cc.mil/100 in. 2 ·day·atm. and a glass transition temperature in excess of 72° C., said (a) and (b) units and said (c) and (d) units respectively being the units formed by reactively combining polyester forming precursors thereof in an amount of at least one mole of the precursors of said (c) and (d) units per mole of precursors of said (a) and (b) units and wherein the precursors of said units in forming said polyester by said reactive combining are in a molar ratio of said (b) unit precursor to said (a) unit precursor of about 90:10 to about 40:60 and a molar ratio of said (c) unit precursor to said (d) unit precursor of about 80:20.
Claim 2
Dependent Claim
150 words
A linear copolyester which can be melted and molded to a clear container, the repeating units of said polyester consisting essentially of ##STR4## said polyester having an oxygen permeability of less than 15 cc.mil/100 in. 2 ·day·atm. and a glass transition temperature in excess of 72° C., said (a) and (b) units and said (c) and (d) units respectively being the units formed by reactively combining polyester forming precursors thereof in an amount of at least one mole of the precursors of said (c) and (d) units per mole of precursors of said (a) and (b) units and wherein the precursors of said units in forming said polyester by said reactive combining are in a molar ratio of said (b) unit precursor to said (a) unit precursor of about 90:10 to about 40:60 and a molar ratio of said (c) unit precursor to said (d) unit precursor of about 80:20.
Claim 3
Dependent Claim
35 words
The copolyester of claim 1 wherein said precursor ratio of (b) to (a) units is about 50:50, said copolyester having an oxygen permeability of about 9 and a glass transition temperature of about 117° C.
Claim 4
Dependent Claim
114 words
In a method of forming a polyester by reactively combining at least one polyester forming dicarboxylic acid, ester or halide thereof with at least a stoichiometric amount of at least one polester forming dibasic alcohol, under conditions of temperature, pressure and catalysis so as to form a polyester, the improvement wherein said acid, ester or halide consists essentially of (1) p,p'-sulfonyldibenzoic acid, esters thereof, or halides thereof and (2) terephthalic acid, esters thereof, or halides thereof, and wherein said alcohol consists essentially of (3) ethylene glycol and (4) neopentyl alcohol, the mole ratio of (2) to (1) being about 90:10 to about 40:60 and the mole ratio of (3) to (4) being about 80:20.
Claim 5
Dependent Claim
114 words
In a method of forming a polyester by reactively combining at least one polyester forming dicarboxylic acid, ester or halide thereof with at least a stoichiometric amount of at least one polester forming dibasic alcohol, under conditions of temperature, pressure and catalysis so as to form a polyester, the improvement wherein said acid, ester or halide consists essentially of (1) p,p'-sulfonyldibenzoic acid, esters thereof, or halides thereof and (2) terephthalic acid, esters thereof, or halides thereof, and wherein said alcohol consists essentially of (3) ethylene glycol and (4) neopentyl alcohol, the mole ratio of (2) to (1) being about 90:10 to about 40:60 and the mole ratio of (3) to (4) being about 80:20.
References Cited (Backward Citations)
GB962913A
Cited
GB1044015A
Cited
FR1456345A
Cited
DE2140615A1
Cited
DE2146055A1
Cited
US3972852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |