Patent US4144285A successfully refreshed from Google Patents.
US4144285A
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US
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Process for producing hydrolysis-stable shaped structures of polyester
Assignee: INVENTA AG fur FORSCHUNG und PATENT-VERWERTUNG ZURICH
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Filing: 1977-06-06
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Granted: 1979-03-13
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Expires: 1997-06-06
Abstract
Abstract A process is disclosed for treating polyester material with at least one N-glycidylimide compound which results in reducing the terminal carboxyl group content of the polyester material.
Inventors
- 👤 Max Maschek
- 👤 Marcel Capaul
- 👤 Wolfgang Griehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:26
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/91; C08G63/914; C08G63/916; C08G63/68; C08G63/685; C08G63/6854; C08G63/6856
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
95 words
In a process for the production of hydrolysis-stable shaped structures consisting essentially of a polyester material produced by the reaction of dicarboxylic acids with substituted or unsubstituted aliphatic diols having the formula HO--(CH.sub.2).sub.n --OH wherein n is an integer of from 2 to 10 or polyesters prepared from hydroxycarboxylic acids, or polymethylene oxides or their ester forming derivatives, the improvement comprising treating said polyester material with at least one N-glycidylimide compound in an amount equal to 0.05-6.0% by weight based on the total weight of said material, whereby the terminal carboxyl group content is reduced.
Claim 2
Dependent Claim
95 words
In a process for the production of hydrolysis-stable shaped structures consisting essentially of a polyester material produced by the reaction of dicarboxylic acids with substituted or unsubstituted aliphatic diols having the formula HO--(CH.sub.2).sub.n --OH wherein n is an integer of from 2 to 10 or polyesters prepared from hydroxycarboxylic acids, or polymethylene oxides or their ester forming derivatives, the improvement comprising treating said polyester material with at least one N-glycidylimide compound in an amount equal to 0.05-6.0% by weight based on the total weight of said material, whereby the terminal carboxyl group content is reduced.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said material is in the form of granules.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein said material is in the form of a melt.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein said polyester material is selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate.
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein said N-glycidylimide compounds are N-glycidylimides of dicarboxylic acids whose carboxyl groups are separated by two or three carbon atoms.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein said amount is equal to 0.2-1.5% by weight.
Claim 8
Dependent Claim
30 words
The process of claim 1 wherein said N-glycidylimide compounds are selected from the group consisting of N-glycidylimides of succinic acid, N-glycidylimides of maleic acid, and N-glycidylimides of cyclic dicarboxylic acids.
Claim 9
Dependent Claim
35 words
The process of claim 1 wherein said N-glycidylimide compounds are N-glycidylimides of dicarboxylic acids selected from cyclohexane -1,2-dicarboxylic acid, phthalic acid, cyclohexane dicarboxylic acids having adjacent carboxyl groups, naphthalene -1,2-dicarboxylic acid and naphthalene 2,3-dicarboxylic acid.
Claim 10
Dependent Claim
22 words
The process of claim 8 wherein said dicarboxylic acid is phthalic acid which may have substituents selected from alkyl, halogen and aryl.
Claim 11
Dependent Claim
19 words
The process of claim 3 further comprising continuously treating said polyester melt with said compound in a melted form.
Claim 12
Dependent Claim
79 words
In a process for the production of hydrolysis-stable shaped structures consisting essentially of a material selected from polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, the improvement comprising continuously treating said polyester material in the form of a melt with at least one N-glycidylimide compound in the form of a melt in an amount equal to 0.05 to 6.0% by weight based on the total weight of said material, whereby the terminal carboxyl group content of said material is reduced.
Claim 13
Dependent Claim
79 words
In a process for the production of hydrolysis-stable shaped structures consisting essentially of a material selected from polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, the improvement comprising continuously treating said polyester material in the form of a melt with at least one N-glycidylimide compound in the form of a melt in an amount equal to 0.05 to 6.0% by weight based on the total weight of said material, whereby the terminal carboxyl group content of said material is reduced.
Claim 14
Dependent Claim
19 words
The process of claim 11 wherein said amount is 0.2-1.5% by weight on the total weight of said material.
Claim 15
Dependent Claim
9 words
A product produced by the product of claim 1.
References Cited (Backward Citations)
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US4016142A
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US3657191A
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US3752866A
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US3975329A
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US4017463A
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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) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |