US4310658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyester thermally stabilized with an oxirane
Assignee: Honeywell International Inc
•
Filing: 1980-06-18
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Granted: 1982-01-12
•
Expires: 2000-06-18
Abstract
Abstract High molecular weight linear condensation polyesters are stabilized against deterioration by heat with a stabilizer comprising 2-(phenoxy methyl)-3-phenyl oxirane.
Inventors
- 👤 Stanley D. Lazarus
- 👤 Robert S. Cooke
- 👤 Paul E. Galick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:10
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1515
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
49 words
A thermally stabilized high molecular weight linear terephthalate condensation polyester having incorporated therein a thermally stabilizing amount of a stabilizer consisting of 2-(phenoxy methyl)-3-phenyl oxirane, said thermally stabilized polyester having a free carboxyl concentration of less than 15 gram equivalents of carboxyl groups per 10 6 grams of polyester.
Claim 2
Dependent Claim
49 words
A thermally stabilized high molecular weight linear terephthalate condensation polyester having incorporated therein a thermally stabilizing amount of a stabilizer consisting of 2-(phenoxy methyl)-3-phenyl oxirane, said thermally stabilized polyester having a free carboxyl concentration of less than 15 gram equivalents of carboxyl groups per 10 6 grams of polyester.
Claim 3
Dependent Claim
14 words
The polyester of claim 1 wherein the linear terephthalate condensation polyester is polyethylene terephthalate.
Claim 4
Dependent Claim
23 words
The polyester of claim 1 wherein 5 to 70 gram moles of said stabilizer is incorporated per 10 6 grams of the polyester.
Claim 5
Dependent Claim
23 words
The polyester of claim 1 wherein 10 to 50 gram moles of said stabilizer is incorporated per 10 6 grams of the polyester.
Claim 6
Dependent Claim
106 words
In a process for the preparation of a high molecular weight linear terephthalate condensation polyester wherein terephthalic acid is reacted with a glycol containing 2 to 10 carbon atoms per molecule under esterification conditions and the resulting esterification product is polycondensed, the improvement which comprises providing a reduction in the free carboxyl content of the polyester to a carboxyl concentration of less than 15 gram equivalents per 10 6 grams of polyester by adding to the polyester after polycondensation of the polyester to an intrinsic viscosity of 0.4 to 1.0, a thermally stabilizing amount of a stabilizer comprising 2-(phenoxy methyl)-3-phenyl oxirane, whereby all reactants are nonmutagenic.
Claim 7
Dependent Claim
106 words
In a process for the preparation of a high molecular weight linear terephthalate condensation polyester wherein terephthalic acid is reacted with a glycol containing 2 to 10 carbon atoms per molecule under esterification conditions and the resulting esterification product is polycondensed, the improvement which comprises providing a reduction in the free carboxyl content of the polyester to a carboxyl concentration of less than 15 gram equivalents per 10 6 grams of polyester by adding to the polyester after polycondensation of the polyester to an intrinsic viscosity of 0.4 to 1.0, a thermally stabilizing amount of a stabilizer comprising 2-(phenoxy methyl)-3-phenyl oxirane, whereby all reactants are nonmutagenic.
Claim 8
Dependent Claim
14 words
The process of claim 5 wherein the linear terephthalate condensation polyester is polyethylene terephthalate.
Claim 9
Dependent Claim
24 words
The process of claim 5 wherein 5 to 70 gram moles of said oxirane compound is added per 10 6 grams of the polyester.
Claim 10
Dependent Claim
24 words
The process of claim 5 wherein 10 to 50 gram moles of said oxirane compound is added per 10 6 grams of the polyester.
Claim 11
Dependent Claim
106 words
In a process for the preparation of a high molecular weight linear terephthalate condensation polyester wherein terephthalic acid is reacted with a glycol containing 2 to 10 carbon atoms per molecule under esterification conditions and the resulting esterification product is polycondensed, the improvement which comprises providing a reduction in the free carboxyl content of the polyester to a carboxyl concentration of less than 15 gram equivalents per 10 6 grams of polyester by adding to the polyester after polycondensation of the polyester to an intrinsic viscosity of 0.8 to 1.0, a thermally stabilizing amount of a stabilizer comprising 2-(phenoxy methyl)-3-phenyl oxirane, whereby all reactants are nonmutagenic.
Claim 12
Dependent Claim
106 words
In a process for the preparation of a high molecular weight linear terephthalate condensation polyester wherein terephthalic acid is reacted with a glycol containing 2 to 10 carbon atoms per molecule under esterification conditions and the resulting esterification product is polycondensed, the improvement which comprises providing a reduction in the free carboxyl content of the polyester to a carboxyl concentration of less than 15 gram equivalents per 10 6 grams of polyester by adding to the polyester after polycondensation of the polyester to an intrinsic viscosity of 0.8 to 1.0, a thermally stabilizing amount of a stabilizer comprising 2-(phenoxy methyl)-3-phenyl oxirane, whereby all reactants are nonmutagenic.
Claim 13
Dependent Claim
14 words
The process of claim 9 wherein the linear terephthalate condensation polyester is polyethylene terephthalate.
Claim 14
Dependent Claim
24 words
The process of claim 9 wherein 5 to 70 gram moles of said oxirane compound is added per 10 6 grams of the polyester.
Claim 15
Dependent Claim
24 words
The process of claim 9 wherein 10 to 50 gram moles of said oxirane compound is added per 10 6 grams of the polyester.
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) | 1985-01-11 | 1985-07-13 | 1986-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-11 | 1989-07-13 | 1990-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-11 | 1993-07-13 | 1994-01-12 | $7700.00 | Window Closed / Lapsed |