US4090995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for hot resin coating of shell sands using salicylic acid
Assignee: Aurora Industries Inc
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Filing: 1977-01-17
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Granted: 1978-05-23
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Expires: 1997-01-17
Abstract
Abstract A process for preparing a resin-coated sand for use in shell molds and cores comprises the steps of mixing the sand with phenolformaldehyde resin and an amount of salicylic acid comprising at least about 3% of the weight of the resin, the mixing being carried out at a temperature above the melting point of the resin so as to form a coating of the resin on the sand and cooling and setting the resin on the sand to solidify the resin coating. The hot mixture of sand and resin is quenched with a mixture of water and hexamethylenetetramine, and it is preferred that at least a portion of the salicylic acid, in an amount equal to at least about 1% of the weight of the resin, be added to the hot mixture of sand and resin in the quench liquid. The sand is heated to a temperature in the range of from about 270° F. to about 320° F. before the sand is mixed with the resin.
Inventors
- 👤 John G. Smillie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:57
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/04; C04B24/06; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; C04B20/00; C04B20/10; C04B20/1018; C04B20/1029; C04B20/1037; C08; C08G; C08G14/00; C08G8/00; C08G8/28; C08K; C08K3/00; C08K3/34; C08K3/36; C08K5/00; C08K5/04; C08K5/09; C04B2111/00; C04B2111/00474; C04B2111/00939
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
86 words
A process for preparing a resin-coated sand for use in shell molds and cores, said process comprising the steps of (a) mixing the sand with phenolformaldehyde resin and an amount of salicylic acid comprising at least about 3% of the weight of the resin, said mixing being carried out at a temperature above the melting point of said resin so as to form a coating of the resin on the sand, (b) and cooling and setting the resin on the sand to solidify the resin coating.
Claim 2
Dependent Claim
86 words
A process for preparing a resin-coated sand for use in shell molds and cores, said process comprising the steps of (a) mixing the sand with phenolformaldehyde resin and an amount of salicylic acid comprising at least about 3% of the weight of the resin, said mixing being carried out at a temperature above the melting point of said resin so as to form a coating of the resin on the sand, (b) and cooling and setting the resin on the sand to solidify the resin coating.
Claim 3
Dependent Claim
30 words
A process for preparing a resin-coated sand as set forth in claim 1 wherein the hot mixture of sand and resin is quenched with a mixture of water and hexamethylenetetramine.
Claim 4
Dependent Claim
54 words
A process for preparing a resin-coated sand as set forth in claim 2 wherein at least a portion of said salicylic acid, in an amount equal to at least about 1% of the weight of said resin, is added to the hot mixture of sand and resin in said mixture of water and hexamethylenetetramine.
Claim 5
Dependent Claim
41 words
A process for preparing a resin-coated sand as set forth in claim 1 wherein the sand is heated to a temperature in the range of from about 270° F. to about 320° F. before the sand is mixed with the resin.
Claim 6
Dependent Claim
111 words
A process for preparing a resin-coated sand for use in shell molds and cores, said process comprising the steps of (a) heating the sand to a temperature in the range of from about 270° F. to about 320° F., (b) mixing the heated sand with phenolformaldehyde resin and an amount of salicylic acid comprising at least about 2% of the weight of the resin to form a liquid coating of the resin on the sand, (c) and quenching the resin-coated sand with a mixture of water, hexamethylenetetramine and an amount of salicylic acid comprising at least about 1% of the weight of the resin, to cool and set the resin coating.
Claim 7
Dependent Claim
111 words
A process for preparing a resin-coated sand for use in shell molds and cores, said process comprising the steps of (a) heating the sand to a temperature in the range of from about 270° F. to about 320° F., (b) mixing the heated sand with phenolformaldehyde resin and an amount of salicylic acid comprising at least about 2% of the weight of the resin to form a liquid coating of the resin on the sand, (c) and quenching the resin-coated sand with a mixture of water, hexamethylenetetramine and an amount of salicylic acid comprising at least about 1% of the weight of the resin, to cool and set the resin coating.
Claim 8
Dependent Claim
113 words
A process for preparing a shell mold or core, said process comprising the steps of (a) mixing the sand with phenolformaldehyde resin and an amount of salicylic acid comprising at least about 3% of the weight of the resin, said mixing being carried out at a temperature above the melting point of said resin so as to form a coating of the resin on the sand, (b) cooling and setting the resin on the sand to solidify the resin coating, (c) forming a shell mold or core from the resin-coated sand, (d) and heating the sand forming the shell mold or core to fuse the resin coating and bond the sand particles together.
Claim 9
Dependent Claim
113 words
A process for preparing a shell mold or core, said process comprising the steps of (a) mixing the sand with phenolformaldehyde resin and an amount of salicylic acid comprising at least about 3% of the weight of the resin, said mixing being carried out at a temperature above the melting point of said resin so as to form a coating of the resin on the sand, (b) cooling and setting the resin on the sand to solidify the resin coating, (c) forming a shell mold or core from the resin-coated sand, (d) and heating the sand forming the shell mold or core to fuse the resin coating and bond the sand particles together.
Claim 10
Dependent Claim
32 words
A process for preparing a shell mold or core as set forth in claim 6 wherein the hot mixture of said and resin is quenched with a mixture of water and hexamethylenetetramine.
Claim 11
Dependent Claim
56 words
A process for preparing a shell mold or core as set forth in claim 7 wherein at least a portion of said salicylic acid, in an amount equal to at least about 1% of the weight of said resin, is added to the hot mixture of sand and resin in said mixture of water and hexamethylenetetramine.
Claim 12
Dependent Claim
43 words
A process for preparing a shell mold or core as set forth in claim 6 wherein the sand is heated to a temperature in the range of from about 270° F. to about 320° F. before the sand is mixed with the resin.
Claim 13
Dependent Claim
81 words
A resin-coated sand for use in shell molds and cores, said sand being produced by: (a) mixing the sand with phenolformaldehyde resin and an amount of salicylic acid comprising at least about 3% of the weight of the resin, said mixing being carried out at a temperature above the melting point of said resin so as to form a coating of the resin on the sand, (b) and cooling and setting the resin on the sand to solidify the resin coating.
Claim 14
Dependent Claim
81 words
A resin-coated sand for use in shell molds and cores, said sand being produced by: (a) mixing the sand with phenolformaldehyde resin and an amount of salicylic acid comprising at least about 3% of the weight of the resin, said mixing being carried out at a temperature above the melting point of said resin so as to form a coating of the resin on the sand, (b) and cooling and setting the resin on the sand to solidify the resin coating.
References Cited (Backward Citations)
US3020254A
Cited
US3692733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |