US4055528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenol-formaldehyde resin for foundry applications
Assignee: Ashland LLC
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Filing: 1976-02-23
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Granted: 1977-10-25
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Expires: 1996-02-23
Abstract
Abstract Disclosed is a phenol-formaldehyde resin for foundry core making having a free formaldehyde content of less than one percent and a water content of 10 to 12 percent.
Inventors
- 👤 Young D. Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:19
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/10; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
A no-bake foundry sand composition comprising: a. a foundry aggregate; b. between about 1 and about 5 parts by weight per 100 parts of aggregate of a phenolaldehyde resin made by: 1. heating phenol and an aldehyde in a mole ratio of aldehyde to phenol of between about 1.05 to 1 and about 1.5 to 1 in the presence of an alkaline catalyst until the free aldehyde content is less than one percent; 2. neutralizing the reaction product to a pH of about 5.5 to about 6.5 by adding an acid; and 3. dehydrating the resultant product to a viscosity of between about 1.5 and about 2.0 stokes and a water content of between about 10 and about 12 percent by weight, and c. between about 10 and about 60 parts by weight per 100 parts of resin of a curing catalyst.
Claim 2
Dependent Claim
142 words
A no-bake foundry sand composition comprising: a. a foundry aggregate; b. between about 1 and about 5 parts by weight per 100 parts of aggregate of a phenolaldehyde resin made by: 1. heating phenol and an aldehyde in a mole ratio of aldehyde to phenol of between about 1.05 to 1 and about 1.5 to 1 in the presence of an alkaline catalyst until the free aldehyde content is less than one percent; 2. neutralizing the reaction product to a pH of about 5.5 to about 6.5 by adding an acid; and 3. dehydrating the resultant product to a viscosity of between about 1.5 and about 2.0 stokes and a water content of between about 10 and about 12 percent by weight, and c. between about 10 and about 60 parts by weight per 100 parts of resin of a curing catalyst.
Claim 3
Dependent Claim
14 words
The foundry sand composition of claim 1, wherein said curing catalyst is p-toluenesulfonic acid.
Claim 4
Dependent Claim
14 words
The foundry sand composition of claim 1, wherein said curing catalyst is benzenesulfonic acid.
Claim 5
Dependent Claim
15 words
The composition of claim 1 wherein said aldehyde is an aqueous solution of an aldehyde.
Claim 6
Dependent Claim
10 words
The composition of claim 4 wherein said aldehyde is formaldehyde.
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) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |