US4089837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shell molding process and composition
Assignee: Hexion Inc
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Filing: 1977-03-07
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Granted: 1978-05-16
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Expires: 1997-03-07
Abstract
Abstract Shell cores and molds are prepared more rapidly by the shell process using resin coated sands wherein the resin is a phenol-formaldehyde novalak resin but having a small amount, e.g. about 1 to about 10 percent by weight, of resorcinol incorporated therein whereby a significant reduction in the cycle time required to produce the cores or molds is achieved.
Inventors
- 👤 Manfred Luttinger
- 👤 George E. Cremeans
- 👤 Louis J. Nowacki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:10
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; C08K5/00; C08K5/04; C08K5/13
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
39 words
A composition for the shell process comprising an admixture of sand, a phenol-formaldehyde novalak resin, a curing agent for the resin and a small but effective amount of resorcinol sufficient to reduce the cycle time of the shell process.
Claim 2
Dependent Claim
39 words
A composition for the shell process comprising an admixture of sand, a phenol-formaldehyde novalak resin, a curing agent for the resin and a small but effective amount of resorcinol sufficient to reduce the cycle time of the shell process.
Claim 3
Dependent Claim
31 words
The composition of claim 1, wherein the phenol-formaldehyde novalak resin is present in the composition at about 1 to about 8 percent by weight based on the weight of the sand.
Claim 4
Dependent Claim
30 words
The composition of claim 2, wherein the curing agent is present in the composition at about 5 to about 22 percent by weight based on the weight of the resin.
Claim 5
Dependent Claim
11 words
The composition of claim 1, wherein the curing agent is hexamethylenetetramine.
Claim 6
Dependent Claim
29 words
The composition of claim 3, wherein resorcinol is present in the composition at about 1 to about 10 percent by weight based on the solids weight of the resin.
Claim 7
Dependent Claim
29 words
The composition of claim 1, wherein resorcinol is present in the composition at about 1 to about 10 percent by weight based on the solids weight of the resin.
Claim 8
Dependent Claim
30 words
The composition of claim 1, wherein the resorcinol is present in the composition at about 2 1/2 to about 8% by weight based on the solids weight of the resin.
Claim 9
Dependent Claim
70 words
A process for forming a shell component comprising mixing a major proportion of sand, a minor proportion of a phenol-formaldehyde novalak resin, a curing agent which makes the resin thermosetting and a small but effective amount of resorcinol, which decreases the cycle time of forming the shell component, and thereafter, placing the mixture in contact with a heated pattern to bond the sand particles together into a hardened shell component.
Claim 10
Dependent Claim
70 words
A process for forming a shell component comprising mixing a major proportion of sand, a minor proportion of a phenol-formaldehyde novalak resin, a curing agent which makes the resin thermosetting and a small but effective amount of resorcinol, which decreases the cycle time of forming the shell component, and thereafter, placing the mixture in contact with a heated pattern to bond the sand particles together into a hardened shell component.
Claim 11
Dependent Claim
32 words
The process of claim 8, wherein the curing agent is hexamethylenetetramine, and the curing agent is present at a concentration of about 5 to about 22 percent by weight of the resin.
Claim 12
Dependent Claim
32 words
The process of claim 8, wherein the resin is present in the mixture at a concentration of about 1 to about 8 percent by weight based on the weight of the sand.
Claim 13
Dependent Claim
29 words
The process of claim 8, wherein resorcinol is present at a concentration of about 1 to about 10 percent by weight based on the solids weight of the resin.
Claim 14
Dependent Claim
29 words
The process of claim 8, wherein resorcinol is present at a concentration of about 2 1/2 to about 8% by weight based on the solids weight of the resin.
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) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |