US4036908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of varnishes based on polyester resin
Assignee: Rhone Poulenc Industries SA
•
Filing: 1976-03-19
•
Granted: 1977-07-19
•
Expires: 1996-03-19
Abstract
Abstract A method of preparing varnishes based on polyester resin, which do not turn green on polymerization. It comprises forming a reducing agent during polycondensation, by reacting a magnesium compound with the reagents present. Applicable chiefly to the furniture industry.
Inventors
- 👤 Gilbert Chretien
- 👤 Gerard Ditacroute
- 👤 Jacques Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:57
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08K; C08K3/00; C08K3/02; C08K3/08; C08K3/18; C08K3/20; C08K3/22; C08K3/24; C09; C09D; C09D167/00; C09D167/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
A process for the preparation of a polyester resin varnish comprising subjecting one or more polycarboxylic acids, at least one of which is an ethylenically unsaturated carboxylic acid, and one or more polyols, at least one of which is a diol, to polycondensation reaction, dissolving the polycondensation reaction product in a copolymerizable vinyl monomer, stabilizing the solution by the addition of an inhibitor with the copolymerizable monomer or after addition of monomer to the solution, adding a cobalt compound to the stabilized solution as an accelerator for cross-linking, and introducing a magnesium compound before 75% completion of the polycondensation reaction whereby reducing groups are formed in the polycondensate which avoid a green discoloration by reason of the presence of the cobalt compound.
Claim 2
Dependent Claim
122 words
A process for the preparation of a polyester resin varnish comprising subjecting one or more polycarboxylic acids, at least one of which is an ethylenically unsaturated carboxylic acid, and one or more polyols, at least one of which is a diol, to polycondensation reaction, dissolving the polycondensation reaction product in a copolymerizable vinyl monomer, stabilizing the solution by the addition of an inhibitor with the copolymerizable monomer or after addition of monomer to the solution, adding a cobalt compound to the stabilized solution as an accelerator for cross-linking, and introducing a magnesium compound before 75% completion of the polycondensation reaction whereby reducing groups are formed in the polycondensate which avoid a green discoloration by reason of the presence of the cobalt compound.
Claim 3
Dependent Claim
25 words
The method of claim 1, in which the magnesium compound is selected from the group consisting of magnesium, magnesium oxide, magnesium hydroxide and magnesium salts.
Claim 4
Dependent Claim
28 words
The method of claim 1, in which the magnesium compound is present in an amount within the range of 0.01% to 0.1% by weight of the reaction mixture.
Claim 5
Dependent Claim
28 words
The method of claim 1, in which the polyester resin contains 20% to 50% by weight of cross-linking vinyl monomer to 80% to 50% by weight of polycondensate.
Claim 6
Dependent Claim
28 words
The method of claim 1, in which the inhibitor is selected from the group consisting of substituted or unsubstituted phenols or polyphenols, paratertiobutylcatechol, and hydroquinone and its derivatives.
Claim 7
Dependent Claim
26 words
The method of claim 1 in which the inhibitor is present in an amount within the range of 20 to 500 ppm of the polyester resin.
Claim 8
Dependent Claim
16 words
The method of claim 1, in which the polymerization initiator is an organic peroxide or hydroperoxide.
Claim 9
Dependent Claim
27 words
The method of claim 7, in which the initiator is employed in an amount within the range of 0.5% to 4% by weight of the polyester resin.
Claim 10
Dependent Claim
24 words
The method of claim 1, in which the cobalt compound is selected from the group consisting of a naphthenate, octoate, octanoate, acetylacetate and acetylacetonate.
Claim 11
Dependent Claim
31 words
The method of claim 1, in which the cobalt compound is employed in an amount within the range of 0.01% to 0.2% by weight of cobalt relative to the polyester resin.
Claim 12
Dependent Claim
17 words
The method of claim 1, which includes stabilizers, additional accelerators and other additives with the polyester resin.
References Cited (Backward Citations)
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US3657387A
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US3766129A
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US3957906A
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US3914200A
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US3901953A
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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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |