Patent US3878159A successfully refreshed from Google Patents.
US3878159A
Expired / Lapsed
US
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Foundry binders on the basis of phenolic resins
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1973-06-12
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Granted: 1975-04-15
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Expires: 1993-06-12
Abstract
Abstract Foundry binders comprising a) a novolak prepared by condensation of phenols with aldehydes, b) a silane, c) a diamide of a longchain monocarboxylic acid, and optionally d) an aromatic carboxylic acid and a process for their production. The foundry binders obtained are particularly suitable for the hot coating of foundry sand in the absence of solvents.
Inventors
- 👤 Silvio Vargiu
- 👤 Silvestro Pezzoli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:47
CPC Classifications
C; C08; C08K; C08K5/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
FOUNDRY BINDERS ON THE BASIS OF PHENOLIC RESINS, COMPRISING A. A NOVOLAK PREPARED BY CONDENSATION OF PHENOL WITH FORMALDEHYDE IN A MOLAR RATIO OF ABOUT 1:0.4 TO 0.9 IN THE PRESENCE OF AN ACID CATALYST AND HAVING A FLUIDITY OF ABOUT 90-110 MM, B. ABOUT 0.05 TO ABOUT 1.0 WT.% OF A SILANE HAVING THE GENERERAL FORMULA
Claim 2
Dependent Claim
57 words
FOUNDRY BINDERS ON THE BASIS OF PHENOLIC RESINS, COMPRISING A. A NOVOLAK PREPARED BY CONDENSATION OF PHENOL WITH FORMALDEHYDE IN A MOLAR RATIO OF ABOUT 1:0.4 TO 0.9 IN THE PRESENCE OF AN ACID CATALYST AND HAVING A FLUIDITY OF ABOUT 90-110 MM, B. ABOUT 0.05 TO ABOUT 1.0 WT.% OF A SILANE HAVING THE GENERERAL FORMULA
Claim 3
Dependent Claim
26 words
Foundry binders in accordance with claim 1, characterized in that they contain about 3.0 to about 5.0 wt.% of the diamide of a long-chain monocarboxylic acid.
Claim 4
Dependent Claim
150 words
Process for the production of the foundry binders in accordance with claim 1, characterized in that a. phenol and formaldehyde are allowed to react at temperatures of about 80* to 160*C in a molar ratio of about 1:0.4 to 0.9 in the presence oF about 0.1 to about 5.0 wt.%, based on the phenol, of an acid catalyst, until the content of free aldehyde is less than 3 wt.%, b. the water liberated is separated from the reaction medium, and c. the novolak obtained, with a fluidity of about 90 to 110 mm is mixed with a silane having the general formula R''Si(OR)3 where R is a methyl or ethyl group and R'' is a residue which is a vinyl group or an alkyl residue substituted with mercapto groups, optionally substituted amino residues, epoxyalkyl residues, or epoxycycloalkyl residues and an aromatic carboxylic acid at temperatures of about 120* to 170*C.
Claim 5
Dependent Claim
24 words
Use of the foundry binders in accordance with claim 1 for the hot coating of core and moulding sands in the absence of solvents.
Claim 6
Dependent Claim
18 words
Foundry binders in accordance with claim 1, wherein said novolak has a fluidity of 100 to 106 mm.
Claim 7
Dependent Claim
18 words
The process in accordance with claim 3, wherein said novolak has a fluidity of 100 to 106 mm.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |