US4357461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester stabilization and composition
Assignee: Graham Packaging Plastic Products Inc
•
Filing: 1981-12-11
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Granted: 1982-11-02
•
Expires: 2001-12-11
Abstract
Abstract Disclosed is a process for preparing a saturated polyester resin containing ##STR1## groups and having good stability against generation of acetaldehyde at elevated temperatures, which comprises having an alkali metal salt of ethylenediaminetetraacetic acid present in the melt polymerization reaction mixture during formation of such polyester, in an amount up to 0.5 mol percent based on the saturated di- and polycarboxylic acid moieties entering into the polymerization reaction, and products.
Inventors
- 👤 Santos W. Go
- 👤 Dennis J. Burzynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:35
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/175
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
66 words
A process for preparing a saturated polyester resin containing ##STR10## groups and having good stability against generation of acetaldehyde at elevated temperatures, which comprises having an alkali metal salt of ethylenediaminetetraacetic acid present in the melt polymerization reaction mixture during formation of such polyester, in an amount up to 0.5 mol percent based on the saturated di- and polycarboxylic acid moieties entering into the polymerization reaction.
Claim 2
Dependent Claim
66 words
A process for preparing a saturated polyester resin containing ##STR10## groups and having good stability against generation of acetaldehyde at elevated temperatures, which comprises having an alkali metal salt of ethylenediaminetetraacetic acid present in the melt polymerization reaction mixture during formation of such polyester, in an amount up to 0.5 mol percent based on the saturated di- and polycarboxylic acid moieties entering into the polymerization reaction.
Claim 3
Dependent Claim
20 words
A process according to claim 1 wherein said salt is present in an amount of at least 0.001 mol percent.
Claim 4
Dependent Claim
20 words
A process according to claim 1 wherein said salt is present in an amount of at least 0.002 mol percent.
Claim 5
Dependent Claim
19 words
A process according to claim 2 wherein said salt is present in an amount up to 0.2 mol percent.
Claim 6
Dependent Claim
22 words
A process according to claim 2 where said polyester has a major weight portion of ethylene terephthalate units of the structure ##STR11##
Claim 7
Dependent Claim
12 words
A process according to claim 2 wherein said alkali metal is sodium.
Claim 8
Dependent Claim
12 words
A process according to claim 2 wherein said alkali metal is potassium.
Claim 9
Dependent Claim
12 words
A process according to claim 5 wherein said alkali metal is sodium.
Claim 10
Dependent Claim
12 words
A process according to claim 5 wherein said alkali metal is potassium.
Claim 11
Dependent Claim
57 words
A saturated polyester having good stability against thermal degradation to yield acetaldehyde which comprises a saturated polyester having ##STR12## groups in its backbone to which has been added an alkali metal salt of ethylenediaminetetraacetic acid during melt polymerization, in an amount of up to 0.5 mol percent of the combined saturated carboxylic acids present in said polyester.
Claim 12
Dependent Claim
57 words
A saturated polyester having good stability against thermal degradation to yield acetaldehyde which comprises a saturated polyester having ##STR12## groups in its backbone to which has been added an alkali metal salt of ethylenediaminetetraacetic acid during melt polymerization, in an amount of up to 0.5 mol percent of the combined saturated carboxylic acids present in said polyester.
Claim 13
Dependent Claim
17 words
A saturated polyester according to claim 10 wherein said salt amount is at least 0.001 mol percent.
Claim 14
Dependent Claim
17 words
A saturated polyester according to claim 10 wherein said salt amount is at least 0.002 mol percent.
Claim 15
Dependent Claim
17 words
A saturated polyester according to claim 12 wherein said salt amount is up to 0.2 mol percent.
Claim 16
Dependent Claim
23 words
A saturated polyester according to claim 11 wherein said polyester has a major weight portion of ethylene terephthalate units of the structure ##STR13##
Claim 17
Dependent Claim
13 words
A saturated polyester according to claim 11 wherein said alkali metal is sodium.
Claim 18
Dependent Claim
13 words
A saturated polyester according to claim 11 wherein said alkali metal is potassium.
Claim 19
Dependent Claim
13 words
A saturated polyester according to claim 14 wherein said alkali metal is sodium.
Claim 20
Dependent Claim
13 words
A saturated polyester according to claim 14 wherein said alkali metal is potassium.
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) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |