US4033925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monomeric furfuryl alcohol-resorcinol foundry binders
Assignee: Qo Chemicals Inc
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Filing: 1976-07-12
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Granted: 1977-07-05
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Expires: 1996-07-12
Abstract
Abstract A monomeric foundry binder comprising furfuryl alcohol and resorcinol is disclosed. The binder is substantially anhydrous, generates no nitrogen, is free of formaldehyde odor both in fabrication of the binder and in production of the sand shapes, and in pouring operations. It provides strengths which are better than those normally achieved with polymeric furfuryl alcohol-containing resins, and provides for quicker strip times.
Inventors
- 👤 Hugh C. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:24
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/36; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/224; C08G61/00; C08G61/12; C08L; C08L71/00; C08L71/08; C08L71/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
51 words
The method of manufacturing foundry sand shapes for use as cores and molds comprising placing a sand mix in the shaping element and hardening the mix in the shaping element, the sand mix comprising sand, an acid catalyst, and a monomeric mixture of furfuryl alcohol and resorcinol, comprising 2-45 percent resorcinol.
Claim 2
Independent Claim
51 words
The method of manufacturing foundry sand shapes for use as cores and molds comprising placing a sand mix in the shaping element and hardening the mix in the shaping element, the sand mix comprising sand, an acid catalyst, and a monomeric mixture of furfuryl alcohol and resorcinol, comprising 2-45 percent resorcinol.
Claim 3
Dependent Claim
19 words
The method of claim 1 in which the monomeric mixture of furfuryl alcohol and resorcinol comprises 4-10 percent resorcinol.
Claim 4
Dependent Claim
20 words
The method of claim 1 in which the acid catalyst is a member selected from the group aromatic sulfonic acid.
Claim 5
Dependent Claim
18 words
The method of claim 1 in which the mixture of furfuryl alcohol and resorcinol also includes a silane.
Claim 6
Independent Claim
84 words
The method of manufacturing sand shapes for use as foundry cores and molds comprising admixing with sand an acid catalyst, and thereafter admixing with the sand-catalyst mixture a binder comprising furfuryl alcohol monomer and resorcinol including from 2 to 45 percent resorcinol, said binder being admixed in an amount of 0.5-3 percent by weight based on the weight of the resulting mixture, said catalyst being used in an amount in the range of 5-100 percent by weight based on the weight of the binder.
Claim 7
Independent Claim
84 words
The method of manufacturing sand shapes for use as foundry cores and molds comprising admixing with sand an acid catalyst, and thereafter admixing with the sand-catalyst mixture a binder comprising furfuryl alcohol monomer and resorcinol including from 2 to 45 percent resorcinol, said binder being admixed in an amount of 0.5-3 percent by weight based on the weight of the resulting mixture, said catalyst being used in an amount in the range of 5-100 percent by weight based on the weight of the binder.
Claim 8
Dependent Claim
16 words
The method of claim 5 in which the binder includes from 4 to 10 percent resorcinol.
Claim 9
Dependent Claim
20 words
The method of claim 5 in which the acid catalyst is a member selected from the group aromatic sulfonic acid.
Claim 10
Dependent Claim
13 words
The method of claim 5 in which the binder also includes a silane.
Claim 11
Dependent Claim
34 words
A foundry binder comprising a monomeric liquid mixture comprising furfuryl alcohol and resorcinol, the resorcinol being present in an amount from 2 to 45 percent by weight based on the weight of the mixture.
Claim 12
Dependent Claim
34 words
A foundry binder comprising a monomeric liquid mixture comprising furfuryl alcohol and resorcinol, the resorcinol being present in an amount from 2 to 45 percent by weight based on the weight of the mixture.
Claim 13
Dependent Claim
48 words
A foundry binder comprising a monomeric mixture of furfuryl alcohol, resorcinol, and a silane, the resorcinol being present in an amount from 2 to 45 percent based on the weight of the mixture, the silane being present in an amount from about 0.1 to 3 percent by weight.
Claim 14
Dependent Claim
48 words
A foundry binder comprising a monomeric mixture of furfuryl alcohol, resorcinol, and a silane, the resorcinol being present in an amount from 2 to 45 percent based on the weight of the mixture, the silane being present in an amount from about 0.1 to 3 percent by weight.
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |