Patent US3077903A successfully refreshed from Google Patents.
Patent US4175067A successfully refreshed from Google Patents.
US4175067A
Expired / Lapsed
US
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Curable binder for large foundry sand shapes
Assignee: Qo Chemicals Inc
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Filing: 1977-08-17
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Granted: 1979-11-20
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Expires: 1997-08-17
Abstract
Abstract A furfuryl alcohol-based foundry binder for use in the manufacture of large foundry sand shapes is disclosed. It is intended as a replacement for conventional alkyd oil foundry binders, and comprises a monomeric mixture of furfuryl alcohol, other alcohols, glycols, or polyols, and high boiling mixtures of ester-substituted diphenyl and polyphenyl aromatic compounds, and a strong acid catalyst. In addition, the binder may include, for example, urea-formaldehyde syrup.
Inventors
- 👤 Roger H. Kottke
- 👤 Scott S. Menard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:23
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/224
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
58 words
A foundry binder comprising monomeric furfuryl alcohol in an amount between 45-85 percent, inclusive, an aromatic resin mixture of carbomethoxy polyphenyl and polycarbomethoxy diphenyls, said aromatic mixture being present in an amount between 5-50 percent, inclusive, another alcohol in an amount between 2-15 percent, inclusive, all percentages being percent by weight based on the weight of the binder.
Claim 2
Dependent Claim
58 words
A foundry binder comprising monomeric furfuryl alcohol in an amount between 45-85 percent, inclusive, an aromatic resin mixture of carbomethoxy polyphenyl and polycarbomethoxy diphenyls, said aromatic mixture being present in an amount between 5-50 percent, inclusive, another alcohol in an amount between 2-15 percent, inclusive, all percentages being percent by weight based on the weight of the binder.
Claim 3
Dependent Claim
19 words
The binder of claim 1 in which the furfuryl alcohol is present in an amount of about 65 percent.
Claim 4
Dependent Claim
26 words
The binder of claim 1 which also includes a urea-formaldehyde ingredient in an amount from 0-30 percent by weight based on the weight of the binder.
Claim 5
Dependent Claim
16 words
The binder of claim 1 in which the binder includes benzyl esters of the toluate family.
Claim 6
Dependent Claim
36 words
The binder of claim 1 in which the other alcohol is a member selected from the group ethylene glycol, diethylene glycol, isooctyl alcohol, isobutyl alcohol, tetrahydrofurfuryl alcohol, propylene glycol, glycerol, isopropyl alcohol, 1-propaneol, butanediol, and pinacol.
Claim 7
Independent Claim
131 words
The method of making foundry sand shapes comprising the steps: a. admixing foundry sand and a strong acid catalyst having a pKa less than 2.3 to produce a sand-catalyst mixture; b. admixing with the resulting sand-catalyst mixture with a binder comprising monomeric furfuryl alcohol in an amount between 45-85 percent, inclusive, an aromatic resin mixture of carbomethoxy polyphenyl and polycarbomethoxy diphenyls, said aromatic mixture being present in an amount between 5-50 percent, inclusive, another alcohol in an amount between 2-15 percent, inclusive, all percents being by weight based on the weight of the binder; said binder being used in an amount of 0.5 to 3 percent based on the weight of the sand, said acid catalyst being used in and amount between 10-75 percent based on the weight of the binder.
Claim 8
Independent Claim
131 words
The method of making foundry sand shapes comprising the steps: a. admixing foundry sand and a strong acid catalyst having a pKa less than 2.3 to produce a sand-catalyst mixture; b. admixing with the resulting sand-catalyst mixture with a binder comprising monomeric furfuryl alcohol in an amount between 45-85 percent, inclusive, an aromatic resin mixture of carbomethoxy polyphenyl and polycarbomethoxy diphenyls, said aromatic mixture being present in an amount between 5-50 percent, inclusive, another alcohol in an amount between 2-15 percent, inclusive, all percents being by weight based on the weight of the binder; said binder being used in an amount of 0.5 to 3 percent based on the weight of the sand, said acid catalyst being used in and amount between 10-75 percent based on the weight of the binder.
Claim 9
Dependent Claim
41 words
The method of claim 6 in which the binder is used in an amount from 1 to 11/2 percent, inclusive, and the catalyst is used in an amount from 2-60 percent by weight, inclusive, based on the weight of the binder.
Claim 10
Dependent Claim
19 words
The method of claim 6 in which the binder includes furfuryl alcohol in an amount of about 65 percent.
Claim 11
Dependent Claim
26 words
The method of claim 6 which also includes a urea-formaldehyde ingredient in an amount from 0-30 percent by weight based on the weight of the binder.
Claim 12
Dependent Claim
13 words
The method of claim 6 which includes benzyl esters of the toluate family.
Claim 13
Dependent Claim
37 words
The method of claim 6 which includes the other alcohol which is a member selected from the group ethylene glycol, diethylene glycol, isooctyl alcohol, isobutyl alcohol, tetrahydrofurfuryl alcohol, propylene glycol, glycerol, isopropyl alcohol, 1-propaneol, butanediol, and pinacol.
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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) | 1982-11-19 | 1983-05-21 | 1983-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-19 | 1987-05-21 | 1987-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-19 | 1991-05-21 | 1991-11-20 | $7700.00 | Window Closed / Lapsed |