Patent US3860561A successfully refreshed from Google Patents.
US3860561A
Expired / Lapsed
US
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Process for the production of epoxy-novolak resins and products thereof
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1973-08-09
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Granted: 1975-01-14
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Expires: 1993-08-09
Abstract
Abstract Process for the production of solid epoxy-novolak resins having a high content of epoxy groups by adding an inorganic base, preferably sodium hydroxide, in a quantity of about 2 to 10 wt. % of total quantity of base to be used to a fused novolak phenolic resin having an average molecular weight of about 500 to 650 and containing about 5 to 6 phenolic hydroxyl groups per molecule at about 80* to 100*C, the total quantity of base to be used corresponding to about 0.9 to 1.1 equivalents of base per mole equivalent of phenolic hydroxyl groups in the novolak phenolic resin, adding a epihalohydrin to the reaction mixture obtained in the course of at least about 2 hours at temperatures of about 80* to 100*C in a quantity of about 3 to 6 moles per mole equivalent of phenolic hydroxyl groups in the novolak phenolic resin, adding the remainder of the inorganic base to the reaction mixture obtained in the course of at least about 3 hours at temperatures of about 85* to 110*C, and separating the solid epoxy-novolak resin from the reaction mixture obtained.
Inventors
- 👤 Silvio Vargiu
- 👤 Sesto S Giovanni
- 👤 Mario Pitzalis
- 👤 Giancarlo Crespolini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:41
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/02; C08G59/04; C08G59/06; C08G59/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
192 words
A solid epoxy-novolak resin obtained by a. adding to a fused novolak phenolic resin having an average molecular weight of about 500 to 650 and containing about 5 to 6 phenolic hydroxyl groups per moLecule at about 80* to 100*C sodium hydroxide in a quantity of about 2 to 10 wt.% of the total quantity of the sodium hydroxide to be used, the total quantity of sodium hydroxide to be used corresponding to about 0.9 to 1.1 equivalents of sodium hydroxide per mole equivalent of phenolic hydroxyl groups of the novolak phenolic resin, b. adding to the reaction mixture obtained in accordance with (a) in the course of at least about 2 hours at temperatures of about 80* to 100*C an epihalohydrine in a quantity of about 3 to 6 moles per mole equivalent of phenolic hydroxyl groups of the novolak phenolic resin, c. adding to the reaction mixture obtained in accordance with (b) in the course of at least about 3 hours at temperatures of about 85* to 110*C the remainder of the sodium hydroxide and d. separating from the reaction mixture obtained in accordance with (c) the solid epoxy-novolak resin.
Claim 2
Dependent Claim
199 words
A process for the production of a solid epoxy-novolak resin which comprises a. adding to a fused novolak phenolic resin having an average molecular weight of about 500 to 650 and containing about 5 to 6 phenolic hydroxyl groups per molecule at about 80* to 100*C sodium hydroxide in a quantity of from about 3 to 6 wt.% of the total quantity of the sodium hydroxide to be used, the total quantity of sodium hydroxide to be used corresponding to about 0.9 to 1.1 equivalents of sodium hydroxide per mole equivalent of phenolic hydroxyl groups of the novolak phenolic resin, b. adding to the reaction mixture obtained in accordance with (a) in the course of at least about 2 hours at temperatures of about 80* to 100*C an epihalohydrine in a quantity of about 3 to 6 moles per mole equivalent of phenolic hydroxyl groups of the novolak phenolic resin, c. adding to the reaction mixture obtained in accordance with (b) in the course of at least about 3 hours at temperatures of about 85* to 110*C the remainder of the sodium hydroxide and d. separating from the reaction mixture obtained in accordance with (c) the solid epoxy-novolak resin.
Claim 3
Dependent Claim
192 words
A solid epoxy-novolak resin obtained by a. adding to a fused novolak phenolic resin having an average molecular weight of about 500 to 650 and containing about 5 to 6 phenolic hydroxyl groups per molecule at about 80* to 100*C sodium hydroxide in a quantity of about 3 to 6 wt.% of the total quantity of the sodium hydroxide to be used, the total quantity of sodium hydroxide to be used corresponding to about 0.9 to 1.1 equivalents of sodium hydroxide per mole equivalent of phenolic hydroxyl groups of the novolak phenolic resin, b. adding to the reaction mixture obtained in accordance with (a) in the course of at least about 2 hours at temperatures of about 80* to 100*C an epihalohydrine in a quantity of about 3 to 6 moles per mole equivalent of phenolic hydroxyl groups of the novolak phenolic resin, c. adding to the reaction mixture obtained in accordance with (b) in the course of at least about 3 hours at temperatures of about 85* to 110*C the remainder of the sodium hydroxide and d. separating from the reaction mixture obtained in accordance with (c) the solid epoxy-novolak resin.
Claim 4
Dependent Claim
196 words
A process for the production of a solid epoxy-novolak resin which comprises a. adding to a fused novolak phenolic resin having an average molecular weight of about 500 to 650 and containing about 5 to 6 phenolic hydroxyl groups per molecule at about 80* to 100*C sodium hydroxide in a quantity of from about 3 to 6 wt.% of the total quantity of the sodium hydroxide to be used, the toTal quantity of sodium hydroxide to be used corresponding to about 0.9 to 1.1 equivalents of sodium hydroxide per mole equivalent of phenolic hydroxyl groups of the novolak phenolic resin, b. adding to the reaction mixture obtained in accordance with (a) in the course of at least about 2 hours at temperatures of about 80* to 100*C epichlorohydrine in a quantity of about 5 moles per mole equivalent of phenolic hydroxyl groups of the novolak phenolic resin, c. adding to the reaction mixture obtained in accordance with (b) in the course of at least about 3 hours at temperatures of about 85* to 110*C the remainder of the sodium hydroxide and d. separating from the reaction mixture obtained in accordance with (c) the solid epoxy-novolak resin.
Claim 5
Dependent Claim
190 words
A solid epoxy-novolak resin obtained by a. adding to a fused novolak phenolic resin having an average molecular weight of about 500 to 650 and containing about 5 to 6 phenolic hydroxyl groups per molecule at about 80* to 100*C sodium hydroxide in a quantity of from about 3 to 6 wt.% of the total quantity of the sodium hydroxide to be used, the total quantity of sodium hydroxide to be used corresponding to about 0.9 to 1.1 equivalents of sodium hydroxide per mole equivalent of phenolic hydroxyl groups of the novolak phenolic resin, b. adding to the reaction mixture obtained in accordance with (a) in the course of at least about 2 hours at temperatures of about 80* to 100*C epichlorohydrine in a quantity of about 5 moles per mole equivalent of phenolic hydroxyl groups of the novolak phenolic resin, c. adding to the reaction mixture obtained in accordance with (b) in the course of at least about 3 hours at temperatures of about 85* to 110*C the remainder of the sodium hydroxide and d. separating from the reaction mixture obtained in accordance with (c) the solid epoxy-novolak resin.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |