US3867346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of liquid epoxy-novolak resins and product thereof
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1973-09-07
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Granted: 1975-02-18
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Expires: 1993-09-07
Abstract
Abstract Process for the production of liquid epoxy-novolak resins having high contents of epoxy groups by (a) mixing and homogenizing a novolak phenolic resin having a molecular weight of about 220 to 300 and with about 2.2 to 2.9 phenolic hydroxyl groups per molecule and an epihalohydrin (about 5 to 10 moles of epihalohydrin are used per mole equivalent of phenolic hydroxyl groups in the novolak phenolic resin), (b) contacting the homogenized mixture with kieselguhr at temperatures of about 20* to 40* C and separating the kieselguhr, (c) adding an inorganic base in the course of at least 1 hour at temperatures of about 80* to 115* C (the total quantity of base to be used being so chosen that the ratio of the number of phenolic hydroxyl groups in the novolak resin to the number of equivalents of base is about 0.78:1 to 0.75:1) and (d) separating the liquid epoxynovolak resin from the reaction mixture obtained.
Inventors
- 👤 Silvio Vargiu
- 👤 Mario Pitzalis
- 👤 Giancarlo Crespolini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:54
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/02; C08G59/04; C08G59/06; C08G59/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
204 words
A PROCESS FOR THE PORDUCTION OF LIQUID EPOXY-NOVOLAK RESINS BY REACTION OF NOVOLAK PHENOLIC RESINS WITH AN EPIHALOHYDRIN IN THE PRESENCE OF AN INORGANIC BASE, CHARACTERIZED IN THAT A. A NOVOLAK PHENOLIC RESIN HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 220 TO 300 AND WITH ABOUT 2.2 TO 2.9 PHENOLIC HYDROXYL GROUPS PER MOLECULE AND AN EPIHALOHYDRIN ARE MIXED AND HOMOGENIZED, ABOUT 5 TO 10 MOLES OF EPIHALOHYDRIN BEING USED PER MOLE EQUIVLANET OF PHENOLIC HYDROCYL GROUPS IN THE NOVOLAK PHENOLIC RESIN, B. THE HOMOGENIZED MIXT!RE IS BROUGHT INTO CONTACT WITH KIESELGUHR AT TEMPERATURES OF ABOUT 20* TO 40*C, THE KIESELGUHR IS THEN SEPARATED, C. AN INORGANIC BASED SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL OR ALKALINE EARTH METAL HYDROXIDES, OXIDES AND CARBONATES IS ADDED TO THE MIXTURE OBTAINED IN ACCORDANCE WITH (B) IN THE COURSE OF AT LEAST 1 HOUR AT TEMPERATURES OF ABOUT 80* TO 115*C, THE TOTAL QUANTITY OF BASE TO BE USED BEING SO CHOSEN THAT THE RATIO OF B T THE NUMBER OF PHENOLIC HYYDROXYL GROUPS IN THE NOVOLAK RESIN TO THE NUMBER OF EQUIVALENTS TO BASE IN ABOUT 0.78:1 TO 0.75:1, AND D. THE LIQUID EPOXY-NOVOLAK RESIN IS SEPARATED FROM THE MIXTURE OBTAINED IN ACCORDANCE WITH (C).
Claim 2
Dependent Claim
204 words
A PROCESS FOR THE PORDUCTION OF LIQUID EPOXY-NOVOLAK RESINS BY REACTION OF NOVOLAK PHENOLIC RESINS WITH AN EPIHALOHYDRIN IN THE PRESENCE OF AN INORGANIC BASE, CHARACTERIZED IN THAT A. A NOVOLAK PHENOLIC RESIN HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 220 TO 300 AND WITH ABOUT 2.2 TO 2.9 PHENOLIC HYDROXYL GROUPS PER MOLECULE AND AN EPIHALOHYDRIN ARE MIXED AND HOMOGENIZED, ABOUT 5 TO 10 MOLES OF EPIHALOHYDRIN BEING USED PER MOLE EQUIVLANET OF PHENOLIC HYDROCYL GROUPS IN THE NOVOLAK PHENOLIC RESIN, B. THE HOMOGENIZED MIXT!RE IS BROUGHT INTO CONTACT WITH KIESELGUHR AT TEMPERATURES OF ABOUT 20* TO 40*C, THE KIESELGUHR IS THEN SEPARATED, C. AN INORGANIC BASED SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL OR ALKALINE EARTH METAL HYDROXIDES, OXIDES AND CARBONATES IS ADDED TO THE MIXTURE OBTAINED IN ACCORDANCE WITH (B) IN THE COURSE OF AT LEAST 1 HOUR AT TEMPERATURES OF ABOUT 80* TO 115*C, THE TOTAL QUANTITY OF BASE TO BE USED BEING SO CHOSEN THAT THE RATIO OF B T THE NUMBER OF PHENOLIC HYYDROXYL GROUPS IN THE NOVOLAK RESIN TO THE NUMBER OF EQUIVALENTS TO BASE IN ABOUT 0.78:1 TO 0.75:1, AND D. THE LIQUID EPOXY-NOVOLAK RESIN IS SEPARATED FROM THE MIXTURE OBTAINED IN ACCORDANCE WITH (C).
Claim 3
Dependent Claim
13 words
A liquid epoxy-novolak resin produced in accordance with the process of claim 1.
Claim 4
Dependent Claim
38 words
A process in accordance with claim 1, characterized in that, in step (b), 1,000 parts by weight of the mixture comprising the novolak resin and the epihalohydrin are brought into contact wiTh 2-4 parts by wt. of kieselguhr.
Claim 5
Dependent Claim
13 words
A liquid epoxy-novolak resin produced in accordance with the process of claim 3.
Claim 6
Dependent Claim
23 words
A process in accordance with claim 1, characterized in that, in step (b), the contact time amounts to about 1 to 60 minutes.
Claim 7
Dependent Claim
13 words
A liquid epoxy-novolak resin produced in accordance with the process of claim 5.
Claim 8
Dependent Claim
33 words
A process in accordance with claim 1, characterized in that about 6 to 8 moles of epichlorohydrin are allowed to react per 1 mole equivalent of hydroxyl groups in the novolak phenolic resin.
Claim 9
Dependent Claim
13 words
A liquid epoxy-novolak resin produced in accordance with the process of claim 7.
Claim 10
Dependent Claim
18 words
A process in accordance with claim 1, characterized in that sodium hydroxide is used as the inorganic base.
Claim 11
Dependent Claim
13 words
A liquid epoxy-novolak resin produced in accordance with the process of claim 9.
Claim 12
Dependent Claim
28 words
A process in accordance with claim 9, characterized in that an approximately 45 to 51 wt. percent aqueous solution of sodium hydroxide is used as the inorganic base.
Claim 13
Dependent Claim
13 words
A liquid epoxy-novolak resin produced in accordance with the process of claim 11.
Claim 14
Dependent Claim
44 words
A process in accordance with claim 1, characterized in that a novolak phenolic resin prepared by condensation of phenol with formaldehyde in a molar ratio of about 1.6:1 to 1.9:1 in the presence of an inorganic or organic acid as a catalyst is used.
Claim 15
Dependent Claim
13 words
A liquid epoxy resin produced in accordance with the process of claim 13.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |